Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007a%26a...475..677s&link_type=abstract
Astronomy and Astrophysics, Volume 475, Issue 2, November IV 2007, pp.677-684
Astronomy and Astrophysics
Astrophysics
24
X-Rays: Stars, Stars: Activity, Stars: Coronae, Stars: General
Scientific paper
Being fully radiative, stars of spectral type A are not expected to harbor magnetic dynamos and hence such stars are not expected to produce X-ray emission. Indeed, while the X-ray detection rate of such stars in X-ray surveys is low, it is not zero and some of the brighter A-type stars have been detected on different occasions and with different instruments. To study systematically the puzzle of the X-ray emitting A-type stars, we carried out an X-ray study of all A-type stars listed in the Bright Star Catalogue using the ROSAT public data archive. We found a total of 312 bright A-type stars positionally associated with ROSAT X-ray sources; we analyzed the X-ray light curves as well as searched for evidence of RV variations to identify possible late-type companions producing the X-ray emission. In this paper we present a list of X-ray active A-type stars, including the collected data about multiplicity, X-ray luminosity and spectral peculiarities.
Tables 2 et 3 are only available in electronic form at http://www.aanda.org
Schmitt Juergen H. M. M.
Schräder Christian
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