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Luminosity
In
physics
,
luminosity
is the
density
of
luminous intensity
in a given
direction
.
In
astronomy
,
luminosity
is the amount of
energy
a body radiates in unit
time
.
Stellar
luminosities are usually expressed as
solar
luminosities,
L
; that is, how many times more energy the object radiates in comparison to the
Sun
. In
X-ray
and
radio
wavelengths, luminosity is sometimes expressed in
watts
. Stars with
bolometric magnitudess
of -10 have luminosities of 10
6
L and stars with bolometric magnitude of +17 have luminosities of 10
-5
L. The
Hertzsprung-Russell diagram
relates luminosity with
absolute magnitude
,
stellar classification
, and surface
temperature
.
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