HD 229041: an X-ray Bright A-Type Giant?
Abstract
X-ray emission is virtually unknown from evolved A-type stars. However, Einstein IPC and ROSAT PSPC observations reveal the presence of an X-ray bright source about 20 arcsec away from the unreddened late A/ early F giant HD 229041. We present an analysis of about 18 ksec of ROSAT PSPC data from this source which shows an unabsorbed thermal X-ray spectrum having log T (K) = 6.96. If the source of the X-rays is HD 229041, then the star has Lx/Lbol = 3 times 10(-5) . We also present UBV photometry of the star obtained with the Automated Photometric Telescope on Mt. Hopkins. Analysis of this photometry suggests possibly periodic variability on a timescale of about 17 days.
- Publication:
-
American Astronomical Society Meeting Abstracts
- Pub Date:
- December 1992
- Bibcode:
- 1992AAS...181.1910C