The photospheric temperature and metal abundance of the compact star H 1504+65.
Abstract
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.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- February 1990
- DOI:
- 10.1093/mnras/242.3.484
- Bibcode:
- 1990MNRAS.242..484B
- Keywords:
-
- Metallicity;
- Photosphere;
- Stellar Atmospheres;
- Stellar Temperature;
- X Ray Stars;
- Abundance;
- Atmospheric Models;
- Exosat Satellite;
- Stellar Spectrophotometry;
- Thermodynamic Equilibrium;
- Astrophysics