Studies of hot B subdwarfs. II - Energy distributions of three bright sdB/sdOB stars in the 950-5500 A range

Details Studies of hot B subdwarfs. II - Energy distributions of three bright sdB/sdOB stars in the 950-5500 A range Studies of hot B subdwarfs. II - Energy distributions of three bright sdB/sdOB stars in the 950-5500 A range

Nov 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...298..859w&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 298, Nov. 15, 1985, p. 859-866. Research supported by the Universite de Mon

Astronomy and Astrophysics

Astrophysics

5

B Stars, Energy Distribution, Lyman Spectra, Subdwarf Stars, Ultraviolet Spectrometers, Iue, Spectrophotometry, Stellar Atmospheres, Stellar Temperature, Voyager Project

Scientific paper

Voyager ultraviolet spectrometer observations of the subdwarf B or OB stars HD 205805, UV 1758+36 and Feige 66 are presented. All three objects display the H I Layman series in absorption. These observations are combined with low dispersion IUE spectrophotometry and with Stromgren photometry to construct virtually complete energy distributions, which extend over the range 950-5500 angstroms. Effective temperatures based on model atmosphere calculations for high gravity, hygrogen rich stars are determined. Our analyses yield Te 28,200 + or - 1300 K for HD 205805, Te 31, 800 + or - 1100 K for UV 1758+36, and Te 35,700 + or 1500 K for Feige 66. The importance of far ultraviolet observations below Lalpha in reducing the uncertainties associated with the interstellar extinction and the degradation of the IUE sensitivity is emphasized.

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