Astrophysics (Index)About

luminosity

(L)
(measure of brightness)

Luminosity is the total rate of energy emission by a star or other astronomical object, often expressed in joules per second, i.e., watts or in solar luminosities (LSun). Thus it is the power of the starshine. Absolute bolometric magnitude is an alternate measure of the same thing, expressed logarithmically. The term is also used in discussions of stellar structure to refer to the energy produced/released within an inner portion of the star, such as citing the luminosity produced within a particular radius of the center, e.g., the stellar core.


(EMR,measure)
Further reading:
http://en.wikipedia.org/wiki/Luminosity

Referenced by pages:
accretion
Achernar
active galaxy
AD Leonis (AD Leo)
active galactic nucleus (AGN)
Algol (Beta Per)
Alpha Centauri
Arcturus
AU Microscopii (AU Mic)
Barnard's Star
Beta Centauri
Betelgeuse
binary star
broad-line region (BLR)
blue horizontal branch (BHB)
bolometric luminosity (LBol)
bolometric magnitude (Mbol)
Canopus
Cepheid variable (CEP)
conditional luminosity function (CLF)
cluster radius
color-magnitude diagram (CMD)
compact object (CO)
distance modulus (μ)
dwarf spheroidal galaxy (dSph)
Eddington luminosity
Epsilon Eridani
Epsilon Indi (ε Indi)
Faber-Jackson relation (FJR)
51 Eridani b
flux
Fanaroff-Riley classification
galaxy group
giant star
globular cluster (GC)
halo abundance matching (HAM)
Hayashi limit
horizontal branch (HB)
Henyey track
Hess diagram
HII region (HII)
hyperluminous infrared galaxy (HLIRG)
HR 8799
H-R diagram (HRD)
Hubble expansion
hypergiant
infrared (IR)
isotropy
Kapteyn's Star
K-type star (K)
Kelvin-Helmholtz mechanism
Kelvin-Helmholtz timescale (KH timescale)
Lacaille 9352
Lalande 21185
luminous blue variable (LBV)
LHS 1140
light cone
luminous infrared galaxy (LIRG)
luminous red nova (LRN)
low-surface-brightness galaxy (LSB galaxy)
luminosity class
luminosity density
luminosity distance (dL)
luminosity function (LF)
Luyten 726-8
mass-luminosity relation
mass-to-light ratio (M/L)
M-type star (M)
molecular cloud
obscured fraction-luminosity relation
O-type star (O)
planetary nebula luminosity function (PNLF)
Procyon
radiant flux
radio source counts
red clump (RC)
red giant
relativistic beaming
red-giant branch (RGB)
Rigel
Ross 154
Ross 248
RR Lyrae variable (RRL)
Salpeter timescale
Sirius
spectral class
spectral type
spin-down luminosity
stellar evolution
stellar luminosity determination
stellar mass determination
stellar parameter determination
stellar radius determination
stellar structure
subdwarf (sd)
subgiant
Sun
sunspot
SuperCOSMOS Sky Survey (SSS)
supergiant
surface density (Σ)
synchrotron radiation
Teegarden's Star
Tully-Fisher relation (TFR)
timescale (t)
TRAPPIST-1
turn-off point (TO)
Type Ia supernova
ultra diffuse galaxy (UDG)
Vega
Vogt-Russell theorem
volume weighting
watt (W)
white dwarf (WD)
Wilson-Bappu effect
Wolf-Rayet star
XBONG
X-ray luminosity function (XLF)

Index