Abstract
view Abstract Citations (40) References (19) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The detection of X-ray variability in O stars. Snow, T. P., Jr. ; Cash, W. ; Grady, C. A. Abstract 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. Publication: The Astrophysical Journal Pub Date: February 1981 DOI: 10.1086/183470 Bibcode: 1981ApJ...244L..19S Keywords: O Stars; Stellar Radiation; Variable Stars; X Ray Sources; Heao 2; Stellar Winds; X Ray Astronomy; Astronomy full text sources ADS | data products SIMBAD (7)
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