Subdwarf star with spectral type B - extremely hot small star
"SdB" redirects here. For other, see SDB (disambiguation).
Artist's impression of a sdB star, showing a giant hot spot[1]Schematic cross-section of a B-type Subdwarf
A B-type subdwarf (sdB) is a kind of subdwarf star with spectral type B. They differ from the typical subdwarf by being much hotter and brighter.[2] They are situated at the "extreme horizontal branch" of the Hertzsprung–Russell diagram. Masses of these stars are around 0.5 solar masses, and they contain only about 1% hydrogen, with the rest being helium. Their radius is from 0.15 to 0.25 solar radii, and their surface temperature is from 20,000 to 40,000 K (19,700 to 39,700 °C; 35,500 to 71,500 °F).
^"Hot stars are plagued by giant magnetic spots, ESO data shows". European Southern Observatory. 1 June 2020. Retrieved 1 June 2020.
^Cite error: The named reference Heber was invoked but never defined (see the help page).
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