AAS 207th Meeting, 8-12 January 2006
Session 182 Stellar Winds, Circumstellar Matter, and Activity
Poster, Thursday, 9:20am-4:00pm, January 12, 2006, Exhibit Hall

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[182.27] X-ray Variability of the O Star \xi Per

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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