X-Ray Spectroscopy of the Hyades Binary 71 Tau

Details X-Ray Spectroscopy of the Hyades Binary 71 Tau X-Ray Spectroscopy of the Hyades Binary 71 Tau

Oct 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009xmm..prop...24s&link_type=abstract

XMM-Newton Proposal ID #06507901

Other

Stars, White Dwarfs, Solar System, Hd 28052

Scientific paper

71 Tau is an enigmatic object for two reasons: (i) it is the second brightest X-ray source in the Hyades, yet early-F stars as a rule are not strong coronal emitters; (ii) it lies 1 mag above the cluster main sequence, implying it is 150 Myr older than other cluster members. Recent HST observations have discovered a faint stellar companion directly south of the primary that is seen only in its UV emission lines. The high emission levels of this object are most readily explained if it is a tight binary of coronally active dG stars. We propose to observe the O VII and O VIII lines near 20 A using the XMM RGS. The ratio of these line strengths will be used to determine whether the UV secondary can account for the striking X-ray properties of 71 Tau.

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