Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...309..230n&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 309, Oct. 1, 1986, p. 230-240. NASA-supported research.
Astronomy and Astrophysics
Astrophysics
37
Hot Stars, Stellar Composition, Stellar Spectrophotometry, Ultraviolet Spectra, White Dwarf Stars, X Ray Stars, Helium, Hydrogen, Metallic Stars, Stellar Temperature
Scientific paper
The optical identification of the bright soft X-ray source H 1504 + 65, originally discovered by the HEAO I A-2 low energy detectors, is reported. The optical counterpart exhibits a steep, virtually featureless continuum from optical wavelengths through the ultraviolet. The spectrum is remarkably featureless except for a broad O VI adsorption feature at 3494.7 A and C IV absorption at 3934 A and emission at 4658 A. The soft X-ray data, which are not consistent with any published models for degenerate stars having predominantly H or He compositions, suggest that H 1504 + 65 is a metal-rich, near-degenerate object of very high temperature. Qualitative considerations indicate that it is definitely hotter than PG 1159 - 035 and similar objects. A temperature of roughly 160,000 K is suggested.
Giommi Paolo
Holberg Jay Brian
Liebert James
Nousek John A.
Pravdo Steven Howard
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