AAS 201st Meeting, January, 2003
Session 12. Activity in Cool Stars
Poster, Monday, January 6, 2003, 9:20am-6:30pm, Exhibit Hall AB

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[12.03] X-ray Emission from the Clump Giant Gamma Tau

N.S. Brickhouse, A.K. Dupree (Harvard-Smithsonian CfA)

We report the analysis of the XMM-Newton spectrum of the Hyades clump giant Gamma Tau. This observation of one of the late-type Hyades giants has implications for understanding the formation of late-type stellar coronae as a function of the evolutionary state of the star. The RGS spectrum was obtained 13 March 2001 for a total exposure of 58.2 ks; however, background from solar flare activity compromises nearly half the data. The spectrum shows strong lines of Fe~XVII and XVIII, O~VII and VIII, and Ne~IX and X. Other weaker lines are also apparent. We present the emission measure distribution and elemental abundances, and discuss the comparison with other clump giant spectra.

This project was funded by NASA NAG-9986.

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Bulletin of the American Astronomical Society, 34, #4
© 2002. The American Astronomical Soceity.