The nature of two faint blue stars - Discovery of a helium-rich sdB and a normal sdB

Details The nature of two faint blue stars - Discovery of a helium-rich sdB and a normal sdB The nature of two faint blue stars - Discovery of a helium-rich sdB and a normal sdB

May 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pasp..103..435s&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 103, May 1991, p. 435-438.

Other

18

B Stars, Blue Stars, Helium, Subdwarf Stars, Abundance, Stellar Atmospheres, Stellar Spectrophotometry, Ubv Spectra

Scientific paper

A coarse spectroscopic analysis is presented of the faint blue stars JL87 and JL111, which are rather different despite their nearly identical UBV colors. JL87 is shown to be a helium-rich subluminous B star. Its abundance ratio n(He)/n(H) = 0.2 is abnormally high compared to the bulk of the sdB stars that have strongly helium-depleted atmospheres relative to the sun. Observers are urged to look for a magnetic field in this star that could have caused the abundance anomaly. The other star, JL111, appears to be a quite normal, slightly hotter sdB.

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