fundamental physical constants

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a	radiation density constant	7.55 x 10-16 J m-3 K-4
c	velocity of light	3.00 x 108 m s-1
G	gravitational constant	6.67 x 10-11 N m2 kg-2
h	Planck's constant	6.62 x 10-34 J s
k	Boltzmann's constant	1.38 x 10-23 J K-1
me	mass of electron	9.11 x 10-31 kg
mH	mass of hydrogen atom	1.67 x 10-27 kg
NA	Avogadro's number	6.02 x 1023 mol-1
	Stefan Boltzmann constant	5.67 x 10-8 W m-2 K-4
R	gas constant (k/mH)	8.26 x 103 J K-1 kg-1
e	charge of electron	1.60 x 10-19 C

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astronomical quantities

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L	luminosity of Sun	3.86 x 1026 W
M	mass of Sun	1.99 x 1030 kg
r	radius of Sun	6.96 x 108 m
Te	effective temperature of Sun	5780  K
parsec	(unit of distance)	3.09 x 1016 m

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symbols

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a	acceleration
A, Z, N	nuclear mass number, charge number, neutron number
B	magnetic induction
B	Planck function
cp, cv	specific heat at constant pressure, constant volume
d, d*	distance, stellar
d	deuteron
e-, e+	electron, positron
E	energy
f	velocity distribution function
f(M)	initial mass function
Fcond, Frad	conductive, radiative flux
g	acceleration due to gravity
h	angular momentum per unit mass
Hp	pressure scale height
i	inclination of orbit
I	intensity of radiation
j	emission coefficient
l	apparent luminosity, mixing length, mean free path
L, Ls, Lrad, Lconv, Lcond	luminosity, total, radiative, convective, conductive
m	apparent magnitude, fractional mass, particle mass
M, MV, Mbol	absolute magnitude, visual, bolometric
M, Ms, Mcrit, Mcc, Mce	mass, total, critical, convective core, convective envelope
n	number density
nf	number of degrees of freedom
n	neutron
O, B, A, F, G, K, M	spectral types of stars
p	momentum
p	proton
P, Pc, Ps, Pgas, Prad	pressure, central, surface, gas, radiation
P	period of orbit
q	charge on nucleus
Q	binding energy of nucleus
r, rs	radius, total
R	Rayleigh number
RSch	Schwarzschild radius
t, td, tth, tn	time, dynamical, thermal, nuclear
T, Te, Tc, Tav	temperature, effective, central, mean
u	thermal energy per unit mass
U	total thermal energy
UBV	stellar magnitudes
v, vesc, vav	velocity, escape, mean
v	volume per unit mass
V	volume, potential energy
x	position
X, Y, Z	mass fraction of hydrogen, helium, heavy elements
	helium 4 nucleus (alpha particle)
	ratio of specific heats
	photon
, ad	PdT/Tdp, adiabatic value
, pp, CN, 3He	energy release, proton-proton, carbon-nitrogen, helium
,  ,	exponents in laws of energy release and opacity
, s, rad, cond	opacity, surface, radiative, conductive
	absorption coefficient
	wavelength
cond, rad	thermal conductivity, radiative
	mean molecular weight
	frequency
e, anti	neutrino, antineutrino
, c, av	density, central, mean
	scattering coefficient
	surface density of disk
	Roche potential
	angular velocity
p	plasma frequency
	gravitational potential energy

The subscript refers to solar values.

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