The OB-type subdwarf HD 149382 and the nature of the subdwarf B stars

Details The OB-type subdwarf HD 149382 and the nature of the subdwarf B stars The OB-type subdwarf HD 149382 and the nature of the subdwarf B stars

Aug 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apj...199..694b&link_type=abstract

Astrophysical Journal, vol. 199, Aug. 1, 1975, pt. 1, p. 694-701.

Other

49

B Stars, O Stars, Stellar Atmospheres, Stellar Spectra, Subdwarf Stars, Abundance, Early Stars, Monochromatic Radiation, Stellar Evolution, Stellar Gravitation, Sulfur, White Dwarf Stars

Scientific paper

Results are reported for analysis of high-dispersion spectra and monochromatic emission measures of the OB-type subdwarf HD 149382. An effective temperature of 40,000 K is determined together with a surface gravity (log g) of 5.8. It is found that helium is deficient by a factor of 10 as compared with Population I stars, sulfur is overabundant by a factor of 10, and all other heavy elements are probably underabundant. This star is shown to be an intermediate case between the O and B subdwarf classes. Suggestions are made as to the nature of Bp stars, B-type subdwarfs, and DA white dwarfs. The evolutionary status of B subdwarfs is considered.

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