The detection of X-ray variability in O stars

Details The detection of X-ray variability in O stars The detection of X-ray variability in O stars

Feb 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...244l..19s&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 244, Feb. 15, 1981, p. L19-L22.

Astronomy and Astrophysics

Astronomy

37

O Stars, Stellar Radiation, Variable Stars, X Ray Sources, Heao 2, Stellar Winds, X Ray Astronomy

Scientific paper

Seven O stars known to have strong, and sometimes variable, stellar winds have been observed repeatedly with the Imaging Proportional Counter on the Einstein Observatory, in a program designed to determine whether the X-ray fluxes from these stars are variable. In three cases, definite changes were seen, either on a time scale of a year (Iota Ori and Delta Ori) or five days (15 Mon). In two of these cases, the X-ray spectrum was harder when the overall flux was higher, indicating that some of the fluctuations may take place in a hot (approximately 10 to the 7th K) emitting region at the bottom of the winds.

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