Discovery of X-ray flaring on the magnetic Bp-star sigma Ori E

Details Discovery of X-ray flaring on the magnetic Bp-star sigma Ori E Discovery of X-ray flaring on the magnetic Bp-star sigma Ori E

2004-02-18

arxiv.org/abs/astro-ph/0402437v1

Astron.Astrophys. 418 (2004) 235-242

Astronomy and Astrophysics

Astrophysics

8 pages, 4 figures, accepted by A&A

Scientific paper

10.1051/0004-6361:20034300

We report the detection of an X-ray flare on the Bp star sigma Ori E with the ROSAT high resolution imager (HRI). The flare is shown to have likely occurred on the early-type star, rather than on an hypothesized late-type companion. We derive flare parameters such as total energy release, coarse estimates of size and density, and also present arguments for a magnetic origin of the flare. We place our observations in the context of a magnetic character of Bp-type stars and speculate on a common physical basis and connection between Bp and Be stars.

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