Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.242..484b&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 242, Feb. 1, 1990, p. 484-488. Research supported by SE
Astronomy and Astrophysics
Astronomy
5
Metallicity, Photosphere, Stellar Atmospheres, Stellar Temperature, X Ray Stars, Abundance, Atmospheric Models, Exosat Satellite, Stellar Spectrophotometry, Thermodynamic Equilibrium
Scientific paper
A new analysis of an Exosat low-energy telescope observation of the hot compact star H1504 + 65 is presented. Earlier results had failed to take into account the large point-spread function produced by the boron filter, and hence the count rate had been underestimated by a large factor. On comparing the data with a new grid of model atmospheres containing CNO metals, the temperature, line-of-sight column density, and photospheric elemental abundances for the star were estimated. Contrary to earlier suggestions it appears that H1504 + 65 is not devoid of He and may also have significant H present in its photosphere. These results are consistent with H1504 + 65 being the hottest member of the PG1159 - 035 spectroscopic group of degenerate stars and not a peculiar individual star.
Barstow Martin Adrian
Tweedy Richard W.
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