Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...290..435b&link_type=abstract
Astronomy and Astrophysics 290, 435-442 (1994)
Astronomy and Astrophysics
Astrophysics
28
Stars: {Sigma} Ori, {Zeta} Ori, Stars: Early-Type, X-Rays: Stars
Scientific paper
X-ray emission in early-type OB stars is thought to be generated by shock-heated gas in the radiatively driven wind of these stars. Calculations of the X-ray production for such a scenario depend on the underlying shock structures, especially the occurrence rate of shocks, cooling length and cooling time which directly influence the source location of the X-rays in the stellar wind. We present a detailed variability analysis of the available ROSAT data for our two program stars σ Ori and ζ Ori. The long-term analysis of both stars covers a time range of 3 years and includes seven pointed PSPC observations, an additional pointed HRI observation for σ Ori and the ROSAT all-sky survey data of both stars. In the case of σ Ori we find no evidence for variability on all analysed time scales. Over a long time range the timing analysis of the X-ray light curve of ζ Ori provides also no evidence for variability. Only during a period of 2 days (September 23-25 1992) did we detect a moderate increase in X-ray count rate by ~ 15%.
Berghoefer Thomas W.
Schmitt Juergen H. M. M.
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