HD 229041: an X-ray Bright A-Type Giant?

Details HD 229041: an X-ray Bright A-Type Giant? HD 229041: an X-ray Bright A-Type Giant?

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.1910c&link_type=abstract

American Astronomical Society, 181st AAS Meeting, #19.10; Bulletin of the American Astronomical Society, Vol. 24, p.1152

Astronomy and Astrophysics

Astronomy

1

Scientific paper

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.

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