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D. Massa (SGT, Inc.), A.W. Fullerton (STScI), R.K. Prinja (UCL)
The UV wind lines of the O7.5 III(n)((f)) star, \xi Per, are known to display cyclical time variability with a period that is closely linked to its rotation period. We have obtained Chandra High Energy Transmission Grating data for this star to determine whether its X-ray flux is also modulated by stellar rotation. We demonstrate that its X-rays are, indeed, variable, that the variability might be associated with the rotation period, and discuss the implications of such a connection. We also present and discuss the mean Medium Energy Grating X-ray spectrum of the star.
This work was supported by NASA through the Chandra X-ray Observatory Center, which is operated by the SAO on behalf of NASA under contract NAS8-03060.
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Bulletin of the American Astronomical Society, 37 #4
© 2005. The American Astronomical Soceity.