ROSAT X-Ray Observations of Hybrid Stars
Abstract
The paper reports on X-ray observations of four hybrid stars with the position-sensitive proportional counter (PSPC) on the Roentgensatellit. Three of the stars, Beta Ind, Mu UMa, and Gamma Aql were detected as X-ray sources for the first time. For one star, Gamma Aql, the detection is of low significance, while for the other two stars, Beta Ind and Mu UMa, enough counts were collected to accumulate for the first time for a hybrid star, a pulse height spectrum and perform a spectral analysis of the pulse height distribution. The dominant emission feature component for both stars is located at temperatures of log T about 6.4. The data are, however, of insufficient signal-to-noise ratio to assess the presence of even hotter temperature components or the possible self-absorption by the also present cool winds in these stars. For the remaining star in the sample, Iota Aur, a sensitive upper limit is reported.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- June 1992
- DOI:
- 10.1086/186424
- Bibcode:
- 1992ApJ...392L..55R
- Keywords:
-
- Hertzsprung-Russell Diagram;
- Rosat Mission;
- Sky Surveys (Astronomy);
- Stellar Coronas;
- X Ray Sources;
- Emission Spectra;
- Iue;
- Stellar Composition;
- Stellar Winds;
- Astrophysics;
- STARS: CORONAE