XMM-Newton Proposal 03056402

Details XMM-Newton Proposal 03056402 XMM-Newton Proposal 03056402

Oct 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004xmm..prop..182b&link_type=abstract

XMM-Newton Proposal ID #03056402

Computer Science

Stars, White Dwarfs, Solar System, Hd 128220, Xmm-Newton Proposal 03056402

Scientific paper

Fast-rotation (v sin i of over 20 km/s) is rare among yellow (G2-K1) giants, restricted to tidally-synchronized binary components and the handful of FK Com- class single stars. Such stars have X-ray luminosities and plasma temperatures among the highest of known coronal sources. A number of yellow giants with v = 100 km/s have been found as companions to hot subdwarfs. These stars have been spun up by accretion of material from the companion during its AGB phase. We find the X-ray emission of the optically-brightest example to be an order of magnitude lower than that of FK Com stars. We propose to observe the only two bright comparable systems to discover whether such a surprisingly inefficient magnetic dynamo is a general outcome of accretive spin-up.

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