(O, O-class star, O star)
(star with spectral characteristics of above 30000 K)
An O-type star (O) is a star within the O-class,
a spectral class indicating stars with ionized
helium absorption lines, a blue color,
and a surface temperature above 30,000 K.
The spectral energy distribution peaks in the XEUV range.
Main sequence stars of this class are on the order of
50 solar masses, 10 solar radii, and 100,000
times solar luminosity.
Such main sequence stars
burn their hydrogen in a few million years.
Characteristics of O-type main sequence stars:
There are also giant stars and
white dwarves that fall under the O-class.
Examples of O-type stars are Mu Columbae (spectral type O9.5 V)
and Mu Normae (spectral type O9.7Iab).
(star type,spectral class)
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Referenced by pages:
globular cluster (GC)
Galactic O Star Catalog (GOSC)
Markarian galaxy (Mkn)
solar mass (MSun)
O5 spectral type (O5)
rare designator prefixes
star formation rate (SFR)
shell star (sh)
superluminous supernova (SLSN)
star formation (SF)
young stellar object (YSO)