The spectrum matches a stellar classification of K0 III-IV, with the luminosity class of III-IV corresponding to an giant stages.
32.
The Ib luminosity class indicates this a lower luminosity supergiant star that has consumed the hydrogen fuel at its core, K-type star.
33.
The brightest O7-8V main sequence stars in Wd1 have luminosity class Ib and II ( V-band magnitudes of 18 20 ).
34.
Some of these features are used to determine the luminosity class, for example certain near-infrared cyanogen band strengths and the Ca II triplet.
35.
A luminosity class V star belongs on the main sequence, which means it is generating energy through the thermonuclear fusion of hydrogen at its core.
36.
The spectrum of this star matches a stellar classification of B5 III, with the luminosity class of III indicating that this is a giant star.
37.
The spectrum of the primary component matches a stellar classification of K0 IV, with the luminosity class of IV indicating this is a subgiant star.
38.
The luminosity class'V'means this is a main sequence star that is generating energy through the thermonuclear fusion of hydrogen at its core.
39.
They have supergiant spectral luminosity classes despite their modest masses and actual luminosities, because they are highly inflated evolved stars with very low surface gravities.
40.
Luminosity class V, main-sequence stars, generally have weak or missing emission lines, with giants and supergiants showing increasing emission line strength.
