Abelian group 140
Absolute magnitude 102
Absorption coefficient 68 92 179
Additive coordinates 143
Adiabatic change of state 170
Advance of perihelion 14
Analogy 217
Apparent (monochromatic) luminosity 80
Apparent colour difference 99
Apparent colour index 91
Apparent magnitude 52 80
Base, basis 35 138
Bolometric correction 102
Bolometric luminosity 46
Brand's lemma 39
Cauchy — Schwarz inequality 58
Colour difference 99
Colour excess 91
Colour index 80
Commutative group 140 213
Comparability 34
Complete sequence 58
Conditional median 49
Conditional probability 49
Conduction 177
Continuity, continuous 138 224
Convection 177
Convergence in the mean 58
Core 176
Deflection of light 3
Differentiable coordinates 140
DIMENSION 36
Emission coefficient 62
Envelope 176 178
Equation of state 174
Equivalence relation 7
Ergiebigkeit 69
Error of observation 218
Extrapolation 218
Flux 76
Fourier series 58
Generalization 218
Gravitational red-shift 11
Group 213
Hertzsprung — Russell diagram 113
Homeomorphism, homeomorphic 138
Homology class, homologous 107 127
Hypothesis 216
Idealization 218
Induction 217
integral 148
Intensity 69 92
Interpolation 218
Interstellar absorption 92
Invariance postulates 37 217
Invariant (differential) equation 145
Invariant function 149 215
Isothermal gas ball 174
Kepler's third law 14 201
Kinetic energy of escape 205
Kirchhoff's law 77
Laguerre polynomial 60
Lane — Emden equation 170
Lane's law 110
Laplace transform 69
Likelihood argument 221
Limb darkening 71
Local Group 139
Local Lie group 140
Locally isomorphic groups 139
Luminosity, bolometric 46
Luminosity, monochromatic 46
Mass estimates 25
Matrix of dimensions 38
Mean free path 29
Measure 34
Median 51
Method of observation 216
MODE 49
| Monochromatic luminosity 46
Monomial differential equation 153
Natural time unit 30
Neighbourhood 138
Normal form (of spectral density) 65
Number density 94
Opacity coefficient 179
Open set 138
Optical depth 68
Orthonormal sequence 57
Partial absorption coefficient 93
Partial colour excess 93
Partial interstellar absorption 93
Period 127
Photo-visual wavelength 98
Photographic wavelength 98
Physical constant 4
Physical quantity 33
Physical relation 33
Physical variable 4
Pi theorem 39
Planck's law 59
Plausibility 217
Point 138
Poisson's equation 169
Poisson's Jaw 170
Polytropic equation of state 170
Polytropic gas ball 170
Primitive notion 216
Primitive proposition 216
probability density 21
Probability of error 10
Proto star 130
Radiation 177
Rayleigh — Jeans law 47
Red giant stars 111
Red-shift 11
Regression 218
Regularity postulates 217
Relative radius 52
Relative temperature 51
Schwarz inequality 58
Similar bodies 7 21 48 107 127 160
Similarity class 7 48 107
Simplicity postulates 217
Source function 69
Spectral density 46
Spherical neighbourhood 138
Stefan — Boltzmann law 49
Subgroup 140 214
Symmetry 220
Temperature 45
Testing hypotheses 222
Theory 216
Time of relaxation 19
Time scale 30
Time-independent local integral 148
Titius — Bode law 201
Too simple hypotheses 221
Topological space 137
topology 137
Total absorption coefficient 93
Total colour excess 93
Total interstellar absorption 93
Transformation group 214
Transformation rule 57
Transmission coefficient 91
True colour difference 99
True colour index 91 99
Two-colour diagram 90 101
UBV photometry 82
UNIT 34
Variable (star) 127
Variance 49
Velocity of escape 205
Vogt — Russell theorem 194
Wien's approximation 59
Wien's displacement law 50
Working hypothesis 217
“New” colour index 80
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