Adams, period of November swarm
Air
and aurora spectra
and aurora spectra
passage of meteorites through
Algol
variability of
variability of
variability of
light curve
Alloys, iron and nickel in meteorites
Analysis, spectroscopic, of meterorites,
in Bunsen flame
in oxy-coal-gas flame
in electric arc
Andromeda, nebula
photograph of, Roberts
spectrum of, Fowler and Taylor
Angstrom
aurora spectrun
his conclusions on the spectrum
temperature of variable stars
spectrum of zodiacal light
Aphelion, comets at, See Comets
Aquarii, alpha, Group III, observations
Aquilae
alpha, Group III, observations
gamma, Group III, observations
Arago, shooting-stars, appearance of
Aratus, quoted
Argelander-Oeltzen, 17681, observation on
Argus
mu, variability of
gamma, spectrum of
Atmosphere, upper reaches of, composition
Augusta County, meteorite found at, Mallet
Aurigae, iota, Group III, observations on
Aurora
and air spectra
and air spectra
brightness of
cause of reddening>
chemical substances indicated
cause of (and following pages)
comparison of comets with
resemblance between
comarison of spectra
resemblance of comets tails to
compared with zodiacal light
remarkable,
January 1831
December 1870
November 1871
May 17, 1875
November 17, 1882
spectrum of
air comparison
characteristic line
characteristic line
characteristic line
and cometary spectra
differs from air spectra
hydrogen comparison
Lemstrom's views
meteoritic comparison
nitrogen line
Norwegian observations
origin of
origin of
origin of
Capron's remarks on
?????
views on,
Angstrom
Angstrom
Denza
Olmsted
Gyllenskiold (and following 7 pages)
Schuster
Vogel
Zenger
Zollner
Ball, Nova Cygni, observation on
Barium
chief flutings of, masking effect
flame spectrum
Baxendel, on shooting-stars
Bessel, on cause of repulsion of comets' tails
Biela
comet, variability
swarm, orbit of
Binary stars
classification of
originate in double nebulae
Bischoff, observation of aurora
Bismuth, flutings of, masking effects
Boguslawski, cometary theory of falling stars
Bompas, sporadic meteors
Bouillaud, period of Mira Ceti
Bredichin
composition of comets' tails
types of
spectra of nebulae
spectra of nebulae
Bunsen burner, order of visibility of lines in a
Candle
spectrum of flame of
flutings visible in
Capron
aurora, November 1882
spectrum, remarks on
spectrum, remarks on
origin of aurorae
views on phosphoretted band in aurora spectra
Carbon
A and B, wave-lengths
absorption in comets preceding perihelion
bands 9 and 10
bands 9,10,11, luminosity due to
bands in aurorae, Vogel
brightest band of, in alpha Orionis
compounds, spectrum of
cometary spectra, important element in
gamma Cassiopeiae, spectrum of
flutings of, masking effects (and following pages)
flutings of, masking effects
flutings of, masking effects
hot and manganese, masking effect in cometary spectra
hot and manganese, masking effect in cometary spectra
in three stars in Cygnus
citrom fluting of, in cometary spectra
cool, spectrum of, the criterion for
cool, spectrum of, in Winneck's comet
hot, spectrum of
changes from cool to hot
radiation, comets at perihelion
radiation, near perihelion
radiation, flutings of
radiation, flutings of
in spectra of comets
variation of blue band
increased intensity in variables
Cassiopeiae, gamma
spectrum
spectrum
hydrogen
magnesium
carbon
Ceta, alpha, Group III star, observation on
Ceta, omiga (Mira)
determination of period
light curve
historical survey (and following pages)
spectrum of, Pickering
new observations
new observations
Espin's observations
Chandler
observation of Pons-Brooks comet
colour-numbers for variables
Chladni
probable composition of comets
meteors, formation of
views on meteorites
views on shooting-stars
views on shooting-stars
Chondroi
description of
description of
meteorites composed of, Reichenbach
metallic, compared with stony
terrestrial
Christie
Coggia's comet, observations on
Great Comet, 1882
Chromium, flutings of, masking effects
Classification
of meteorites, Daubree
stellar (and following pages)
Colours of stars, See Stars
Coma, of comets
Combinations, chemical, in meteorites
Comet
Biela's, double
Brorsen's,
Brorsen's, at aphelion, spectrum of
carbon, observation, Bredichin
carbon, observation, Kenkoly
discrepancy of hot carbon in spectrum
return of, Young
return of, Young
Coggia's
D' Arrest's observation
Christie's
Vogel's
description of
Encke's
reduced period of revolution
1871, spectral changes
Pons-Brooks'
variability
Sawerthal's
variability
Tempel's
distance
Wells'
Copeland's observation on
Copeland's observation on
dark bands in spectrum, Vogel
first appearance
luminosity
Vogel's observations
Vogel's observations
probable origin of lines and bands
sodium line in spectrum of, Vogel
spectrum of, Copeland
spectrum of, discontinuity
spectrum of, early observations
variability
Hasselberg's views on
Winnecke's
evidence of cool carbon
1877, observation on
Lord Lindsay
1862, III
a meteorite
elements of orbit
1866, I
elements of orbit
b 1881
Huggins, spectrum of
observation of
spectrum at perihelion
III, 1881
double effect of masking
observation on, Copeland
observation on, Copeland
observation on, Hasselberg
spectral changes
Great, 1882
colour of nucleus
Copeland, observations
Copeland, observations
earliest observations
Vogel's observation
perihelion
perihelion
probable origin of lines
spectral changes
spectral changes
spectrum of
spectrum of
Comets
absence of hydrogen
action of gravity
aphelion distances
approach to perihelion
approach to perihelion
lead radiation
at aphelion, spectra of
at mean distance, spectrum of
at perihelion
carbon radiation
carbon radiation
cause of bright lines
spectrum of
aurorae and, comparison of spectra of
aurorae and, comparison of spectra of
bright-line stars, connection between
bright-line stars, connection between
change of form, Roche
comparison of orbits of meteors with
composition of, probable
Chladni
Newton
Reichenbach
Tait
details of
distance of visibility of
early spectroscopic observation, Donati
elements of paths of meteors and, A.S. Herschel
head, composition of
theoretical construction
irregular luminosity
jets
jets
jets
letter to Abbe Cesaris, Maskelyne's
luminosity of, old view
origin of
Hasselberg
Hasselberg
Reichenbach
luminosity, three kinds of collisions
manganese (says at page 586, but book ends at 559!)
manganese; absence of
mass, Tait
meteors and, conection between
meteors and, conection between
mixed fluting group stars, comparison
mixed fluting group stars, comparison
nebulae and, comparison of spectra
nebulae and, comparison of spectra
nebulae and, comparison of spectra
nuclei, multiple
nuclei, multiple
number of tails
origin of
origin of
origin of
orbits of, dimensions
perihelion distances of
preceding perihelion, lead absorption
preceding perihelion, masking effects
receding from perihelion, sequence of changes
spectra of, absence of manganese
spectra of, absence of manganese
spectra of aurorae and, individual observations
spectra of
compared with meteorites
D3 and b absent
hydrogen lines invisible
Young's views on
spectral changes, sequence
spectral changes, sequence
spectral changes, sequence
tails of
....
....
....
cause of repulsion
curved, cause of
phenomena of, Tait
resemblance to aurorae
transparency of
views on, Roche
telescopic view of
vapours given out by
velocities of the meteorites in
views on
Chladni
Halley
Maskelyne
Schiaparelli
visibility of, Hind
Compounds
carbon, spectra of
gaseous, in meteorites
Condensation, phenomena in Group II
Copeland
observation on Brorsen's comet
comet spectra
Comet Wells
Comet Wells
Comet Wells
Comet III, 1881
Comet III, 1881
Great Comet, 1882
Great Comet, 1882
Great Comet, 1882
Gamma Argus
nebulae spectra
carbon bands in a Nova
Coulvier-Gravier, views on meteorites
Crawford (Lord)
observations on a new star in Cygnus, 1877
Crust on meteorites
Curve, temperature
Curves, light, forms of
Cygni
alpha, gamma, delta, Group III, observations
sigma, variability of, Kirch
P, bright-line star, Pickering
R, Espin's observations
U, Knott's observations
Cygnus
1st, spectrum of
2nd, spectrum of
3rd, spectrum of
stars in, sequence of temperature
line 636, Vogels views on
spectrum, Fowler
carbon 517 in spectrum of
variability of D
D'Arrest
observation on Coggia's comet
on nebulae
Darwin, Prof. G.
application of the kinetic theory of gases to meteor swarms
Daubree
on explosion of meteorites
classification of meteorites
Denning
meteor showers
beginning-heights of meteors
Denza, remarks on aurorae
Draper, Orion nebula spectrum photographed
Duner
observations on Class IIIa, general discussion
discussion of individual observations
results of discussion
observations on alpha Orionis
colour notation for variables
Dust
meteoritic, possibly causing aurora
Groeneman's views
Elements
chemical, in meteorites
spectra of, maps of
spectra of, maps of
sequence of various bands
tables
Ellery, observations of gamma Argus
Encke's comet
End-on tubes, use of
Envelopes,cometary, relation to jets
Espin, observations on variables stars
Evolution, line of, in Group II
Explosion of meteorites
Hirn's views
Daubree's views
Fabricius, observations of Mira
Fall
accompany phenomena
Prof. H. A. Newton on
in Alsace
in Berkshire
in Ireland
near Mazapil
in Phrygia
at Thwing
in United States
Falling stars. See Shooting-stars
Faye
comets, distance of visibility of
tail of, cause of repulsion
construction for obtaining curvature
Finlay, Great Comet of 1882, observations of
Fireballs. See Shooting-stars
Flamsteed, Algol, periodicity of variations
Flutings
bright, produced by contrast
paling of, cause of
Fowler
observations of spectrum of stars in Cygnus
Andromeda nebula
alpha Herculis
nebula in Orion
nebula in Orion
Mira Ceti
Franunhofer, observations on star spectra
Fullenius observes Mira
Gases
occluded
Wright's observations
Glows, meteoritic, sodium lines in
Goodricke
Algol, periodicity of
Beta Lyrae, observations on
Gore, catalogue of variables
Gothard
observations of Beta Lyrae
observations of Gamma Cassiopeiae
Graham, experiment with Lenarto meteorite
Greig, determination of radiant points
Groeneman
observations of aurorae, Nov 1871
observations of aurorae, Nov 1882
meteoritic dust theory
Group I
distinction between Group II and
subdivisions of
sub-group, bright-line stars
Group II
absorption flutings and bands in, origin of
Omicron Ceti, observations on
classification into species
conditions of variability
distinction between Group I and
distinction between Group III and
specific differences in
stars of, colour condition
subdivisions of, colour numbers corresponding to
sub-groups and species (and following pages)
variables, irregular
variable stars, bright hydrogen
various species of, characteristics of
Group III
condensing swarms, far condensed
distinction between Group II and
distinction between Group IV and
line 540 due to manganese
passage from Group II to
prominent lines in
sequence of phenomena, general statement
sequence of spectra in
some lines special to
specific differences in, observations referred to
stars (and following 3 pages)
thickness of F and E
variation of intensity of lines in
Group IV
alpha Lyrae observations
distinction between Group III and
Group V
distinct characteristics
Groups I and II
conecting link between
variability of bodies in
Groups I and VII
colour of stars in
Groups III and V
criteria from observations between
variability of bodies in
Guillemin, comets' tails, resemblance to aurorae
Gyllenskiold
views on aurora
observations
Hind, variables, haziness of
Hirn, explosion hypothesis of meteorites
Holwarda, periodical changes of light of stars
Huggins
Brosen's comet, observations
nebulae, origin of
nebulae, origin of
nebulae, spectra of
nebulae, spectra of
nebulae, spectra of
on planetary nebulae
Cobet b, 1881, spectrum of
Humboldt
observation on shooting-stars
observation on shooting-stars
Hydrocarbon, characteristic fluting of
Hydrogen
absence of, in comets
absorption of, Group IV
bright, in variable stars of Group II
F line importance of observing
method of supplying
low temperature spectrum of
period in Beta Lyrae of lines of
periodicity in Gamma Cassiopeiae of lines of
phosphoretted, spectrum of
spectrum of, aurora comparison
variability of F line of
Interspaces
extreme conditions, considerations
reduction of, results
Iowa, meteorite, composition of, Wright
Iron
absorption, in comets preceding perihelion
alloys in meteorites of nickel and
lines of, in spectra of meteorites
spectrum of pure
Irons and stones
difference between
chemical analysis of
chemical characteristics of
d'Octibbeha County, composition of
general appearance of
low temperature spectrum
Jets
cometary
variation in form of
Sir John Herschel's views on
Junquis, observations of Mira
Kepler
views on shooting-stars
comets
comets' tails
views on Mira
Kirch, Psi Cygni, variability of
Kirkwood
on August swarm
origin of comets
aphelion distances of comets
November meteors
Knott
light curves
observations
observations
Konkoly
meteor of July 1873, observation on
Brorsen's Comet, 1879, observations on
Gamma Cassiopeiae, observations
Lalande 13412, spectrum of
Laussedat, meteor paths, determination of length of
Lead
absorption of, in comets near perihelion
radiation of, comets approaching perihelion
spectrum of, magnesium and nitrogen comparison
Lefroy, description of aurora, May 17, 1875
Lemstrom, aurora spectrum
Lenarto, meteorite, comparative experiment, Graham
Leonids
attracted by Uranus, Le Verrier
brilliancy, variation in
density of ring
orbit of
orbit of
orbit of
Le Sueur, Orion nebula, spectroscopic observation
Le Verrier, views on Leonid swarm
Lichtenbergh, direction of shooting-stars
Light
zodiacal and, aurora compared
zodiacal and, spectrum of
curve used to represent life of a star
of variable stars
of variable stars
Lightning
spectrum of, Herschel
spectrum of, Schuster
Lindsay (Lord), observation on Winnecke's comet
Liveing and Dewar, wave-lenghts of magnesium flutings
Lohse
observation on Brorsen's comet
nebulae
Luminosity, meteoritic commencement of
Lyra, ring nebula in, spectrum of, Vogel
Lyrae
alpha, Group IV, observations
beta, hydrogen lines in, period of
light curve
originates in two swarms
Goodricke's observations on
spectrum of, Gothard
Lyrids, radiant point, motion of
Magnesium
b line of, Konkoly
fluting of, at 500, effect of masking on
in gamma Cassiopeiae, Sherman
comets near perihelion
changes in spectrum of
effect of temperature on spectrum of
in Comet III, 1881, Hasselberg
in meteorites
in meteorites
radiation, in cometary spectra at perihelion
spectrum of
experiments with
in nebula of, Orion comparison
nitrogen and lead comparison
Mallet, Augusta Country meteorite
Manganese
absorption of, in comets preceding perihelion
540, absence in comets
558, observation of, in comets aproaching perihelion
586, in comets, absence of
chief flutings of, masking effect
hot carbon and, masking effect
nodules, analysis of
nodules, analysis of
radiation of, masking effect in spectra
Maraldi, observations of Algol
Maskelyne, Dr.
letter to Abbe Cesaris on comets
N. S. origin of meteorites
on thumb-marks
Masking
effects of, cause of
main results of, in Group II
Maunder
observation on Comet Wells
Orion Nebula
Meteor
of Crema, September 1511
July 1873, Konkoly's observation of
swarms, views of Schiaparelli
Meteors
August, dimensions of orbit
August, dimensions of orbit
comparison of orbits of comets with
Chladni's view of formation of
frequency of appearance
luminous, extract from B.A. Committee Report
luminous, hourly number
magnesium lines in
November, elements of orbit
November, variability
paths of
showers of, Denning's notes on
showers of, duration of
spectra of
sporadic
sporadic
sporadic
systematic or periodic
telescopic
velocities of, H. A. Newton
velocity of
Mira Ceti See Ceti omiga
Montanari, observations of Algol
Movement, rate of meteorites through air
Murray
on deep-sea deposits
on deep-sea deposits
manganese nodules
manganese nodules
Nebula in Andromeda
carbon bands in
Roberts's photograph
Nebula in Vulpecula (Dumb-bell), spectrum of
Nebula in Orion
spectrum of
spectrum of
spectrum of
magnesium comparison
Maunder
Nebulae
association of meteorite with, Tait
classification of, Herschel, Sir W. (and following 2 pages)
cometic
and comets
comparison of spectra
comparison of spectra
resemblance between
D line of sodium, no record of
globular, final stage of formation
globular, suggested origin of
historical notice
light of, cause of, Herschel, Prof. A.
lines in, method of observing
Dumb-bell, Sir John Herschel's views on
observations, Sir J. Herschel
origin of, distinct from that of stars, Huggins
planetary
Sir W. Herschel
Sir J. Herschel
Huggins
Lord Rosse
proposed origin of
spectrum of, Secchi
regular forms of, grouping
ring, views on, Herschel's, Sir John
species of
spectrum of
...
Bredichin's observation
Bredichin's observation
chief lines in
chief lines in
chief lines in
chief lines in
chief lines in
Copeland's observations
D'Arrest's observations
D3 and b in
Huggins's observations
Huggins's observations
hydrogen lines visible
Lohse's observtions
new observations
new observations
Vogel's observations
Winlock's observations
spiral
spheroidal
spheroidal
temperature of
variability of
views on
Halley
Sir W. Herschel (and following 6 pages)
Huggins
variability conditions in
Newton, Sir I.
views on Novae
views on variables
Newton, H. A.
extract from a lecture on falls by
comets are meteorites
density of Bela swarm
luminous meteors, number of
old records of Leonids, table of
orbit of Persids, dimensions of
first appearance of shooting-star
shooting-stars, cosmic origin of
shooting-stars, early record of
sporadic meteors
velocities of meteors
Nickel
alloys in meteorites of iron and
variability in siderites
Nitrogen, spectrum of
magnesium and lead comparison
wave-length of lines in
Nodules
manganese
analysis of
origin of
spectrum of
Nordenskjold, examination of Stalldalen meteorites
Novae
November swarm,
elements of orbit
elements of orbit
Nucleus
of comet at perihelion, spectrum of
of meteor, spectrum of
Obernkirchen, meteorite, spectrum of
Olbers, on repulsion of comets' tails
Olivine, presence of, in meteorites
Olmsted
diurnal motion of radiant point
cause of shooting-stars
views on aurora
Ophiuchi
Beta, Group III, observations
Psi, Group III, observations
Oppolzer
elements of comet, 1886, I
comparison of meteor and cometary orbits
Orion, nebula
spectroscopic examination of
spectroscopic examination of
spectroscopic examination of
magesium comparison
spectrum, photographed, Draper
spectrum, photographed, Huggins
observations of
Fowler
Fowler
Lieut. J. Herschel
Le Sueur
Maunder
Lord Oxmantown
Secchi
Taylor
Orionis, alpha, Duner's observations
Oxmantown (Lord), nebula in Orion, spectroscopic observations
Oxygen, negative pole spectrum of
Pechule, blue star
views on Vogel's stellar classification
Pegasi, epilson, Group III, observations
Perihelion
comet after, greatest brilliancy
comets approaching, spectrum
comets approaching, spectrum
comets at, effects
comets at, spectrum of
Persei, Beta, Group III, observations
Perseids, radiant point
Pickering
observations of Argelander-Oeltzen 17681
Lalande 13412
Mira
Mira
Mira
P Cygni
on causes of variability
Pittings on meteorites, possible cause of
Pleiades
photograph of
structure of
Pleione, spectrum of
Pole
negative, spectrum of
oxygen at
Pons-Brooks, comet, variability
Pritchard, on shooting-stars
Radiant
point
point
apparent positions of
diurnal motion of
of Perseids
Raillard
aurora and comets, connection
comets and meteors, connection
Reichenbach
origin of comets, luminosity
chondroi in meteorites
shooting-stars, cometary theory
Reinsch, on varnish on stones
Renard
deep-sea deposits
deep-sea deposits
manganese nodules, analysis of
Repulsion, solar, effect on comets
Respighi
observations of gamma Argus
zodiacal light
Roberts
nebula in Andromeda
Orion
Velpecula
photograph of Pleiades
Roche, on comets
change of form
probable construction of head
views on comets' tails
Rosse (Lord)
nebulous fluid, views on
on planetary nebulae
Rudberg, aurora, December 1870, observation
Rutherfurd, stellar spectra, classification
Sawerthal's, comet
Schiaparelli
comets, views on
conclusions on matter in space
Leonid swarm, researches on
meteor and cometary orbits, comparison of
meteors, movement of
November ring, orbit of
shooting-stars, cosmic origin of
sporadic meteors
velocities of meteors
Schuster
aurora, spectrum of
spectrum of lightning
Sea,
deep, deposits
deep, deposits
Secchi
observations of gamma Cassiopeiae
Brorsen's comet
nebula of Orion
planetary nebulae
stellar spectra, classification
Section, microscopical, of a meteorite
Sequence,
of spectra in comets
Group II
Group III
Sherman
observations on gamma Cassiopeiae
observations on gamma Cassiopeiae
Shooting-stars
cause of, Olmsted
colour of
cometary theory, Boguslawski
cometary theory, Reichenbach
cosmic origin of
cosmic origin of
determination of lengths of visible paths
direction of
direction of
early record of
end-height of
Humbolt's observations
Humbolt's observations
height of first appearances
Leonids, direction of motion
old records
1202
1202
of Leonids
orbits of distribution of
origin of
paths of, explanation of
Perseids, direction of motion
radiant point
spectra of
velocity of
velocity of
views on
Chladni
Chladni
Kepler
Siderites
variability of iron and nickel in
Smoke
origin of, in explosions of meteorites
Sodium
D line absent while green line is visible
green line
green line
Spark
arrangement for making an electric
jar, spectra of meteorites at temperature of
quantity, lines of metals in meteorites
spectra of meteorites in
Species
in Group II, characteristics of
in Group III
Spherules
in stones
magnetic, examination of
silicate, description
Stalldalen, meteorite
Stars
binary
colour classification
clour Classes I-V (and following 5 pages)
components of
components of
conclusions
origin of
bright-line
....
absence of magnesium 500
and comets, connection between
and comets, connection between
and nebulae
discussion on spectra of
hydrogen in
origin of
origin of
spectra of
sub-group of Group I
classification
....
Groups I and II, distinction between
Rutherfurd
Secchi
Vogel
colour of, grouped
colour and magnitude relations
colour and mass
colour-classes (and following pages)
general classification of
grouping of, general statements (and following pages)
mixed bright and dark flutings, origin of
mixed fluting group, cool carbon absent
mixed fluting group of, comparison with comets
mixed fluting group of, comparison with comets
multiple origin of (and following pages)
origin of, new views on
origin of, objections to old view
relative ages of, Zollner
effect of repulsion on spectrum of
variation in thickness of H and K
temperature of
variable See Variables
Stones
carbonaceous, general appearance of
composition of
composition of
examination of
varnish on
and irons, difference between
Sun, spectrum of, from K to D, compared with spectrum of meteorites
Sundell, spectrum of air
Tails of comets See Comets
Tait
views of comets' constitution
masses of comets
origin of comets' tails
associated meteorites with nebulae
Tauri, alpha, Group III, observation on
Taylor
spectrum of Andromeda nebula
Orion nebula
Orion nebula
Tempel's comet
Temperature curve
....
position of Vogel's Class IIa
position of Vogel's Class IIIa and Class IIIb
Thumb-marks on meteorites
Tubes, end-on, use of
Tuttle's comet
Variability
various conditions of (and following 2 pages)
regular, cause of
irregular, causes of
bodies of Groups I and II
Bouillaud's views
causes of, Zollner's view
causes of, Newton's views
causes of, Newton's views
Sir W. Herschel's views
Maupertuis's views
Pickering's views
Variables
arrangement in groups
bright hydrogen in Group II
early observations by
Fabricius
Kepler
Hevelius
Holwarda
Junquis
Kirch
Goodricke
irregular, Group II
relation of colour to period
relation of colour to period
colour notation for, Duner
colour notation for, Chandler
temperature of Angstrom
catalogue of, Gore
Varnish, on stones
Velocity, highest meteorite
Visibility, order of lines in spectrum
Vogel
vies on aurorae
spectrum of lighting
observation on Great Comet 1882
observation on Comet Wells
observation on Comet Wells
Nebulae
Nebulae
ring nebula in Lyra
Argelander-Oeltzen 17681
1st Cygnus
2nd Cygnus
3rd Cygnus
Gamma Cassiopeiae
Lalande 13412
stars, clasification of
Vulpecula
Dumb-bell nebula in, spectrum of
Wartmann
velocities of shooting stars
Weights
of largest meteorites
of meteorites, how estimated
variation in
variation in
Wells, Comet
luminosity produced by
variability
Widmanstatten
figues of
figues of
Winlock
spectra of nebulae
Wolf and Rayet's three stars in Cygnus
spectrum of
variability of D
Wright
on composition of Iowa meteorite
on occluded gases in meteorites
Young
aurorae and cometary spectra
views on cometary spectra
Zenger
observations on aurorae
Zollner
on causes of variability
relative ages of stars
views on aurorae