Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994ap%26ss.221..309b&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 221, no. 1-2, p. 309-320
Astronomy and Astrophysics
Astronomy
12
B Stars, Light Curve, O Stars, Spectrum Analysis, Stellar Physics, Stellar Winds, Time Dependence, Variability, X Ray Astronomy, X Ray Spectra, X Rays, Heao 2, Rosat Mission, Shock Waves, Sky Surveys (Astronomy), Stellar Models
Scientific paper
We have investigated ROSAT X-ray data of OB stars to search for evidence of time variability in the X-ray emission from early-type stars. As an example for such studies we present a detailed variability analysis for our two program stars sigma Ori and zeta Ori which have been multiply observed with ROSAT. The long-term analysis of both stars now covers a time range of 2.5 years and includes six pointed PSPC observations, an additional pointed HRI observation of sigma Ori and the ROSAT all-sky survey data of both stars. Over a long time range the X-ray light curves of sigma Ori and zeta Ori show no evidence for variability. In the case of zeta Ori we detected a moderate increase in X-ray count rate during a period of 2 days which can be explained as a strong shock propagating in the wind of an O-type star.
Berghoefer Thomas W.
Schmitt Juergen H. M. M.
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