(type of star with about 50 times the mass of the Sun)
An O-type star (O) is of the O-class, a
spectral class for stars of around 50 solar masses
and 10 solar radii.
They burn up their hydrogen in a few million years.
They have weak hydrogen absorption lines.
(star type,spectral type)
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globular cluster (GC)
Markarian galaxy (Mkn)
solar mass (MSun)
O5 spectral class (O5)
star formation rate (SFR)