Astrophysics (Index)About

S-type star

(S)
(type of star with lines indicating zirconium)

An S-type star is a star within the S-class, a spectral class indicating zirconium monoxide spectral bands and lines. They are cool giant stars in the asymptotic giant branch or red-giant branch. They generally have similar amounts of carbon and oxygen. The presence of zirconium indicates either convection (intrinsic S-star), or previous mass transfer between binary companions (extrinsic S-star). Their effective temperature is roughly the range of M-type stars, but extrinsic S-stars can also be a bit warmer, within the range of K-type stars.


(star type,spectral class)
Further reading:
https://en.wikipedia.org/wiki/S-type_star
https://en.wikipedia.org/wiki/Stellar_classification#Class_S
https://ui.adsabs.harvard.edu/abs/2018A%26A...617A..23B/abstract
https://www.universeguide.com/fact/stypestars
https://lweb.cfa.harvard.edu/~pberlind/atlas/htmls/sstars.html

Referenced by pages:
chemically peculiar star (CP star)
rare designator prefixes
red giant
spectral class
technetium star

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