Probing the Mysterious IR excess in Close Binary Stars

Details Probing the Mysterious IR excess in Close Binary Stars Probing the Mysterious IR excess in Close Binary Stars

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop20713d&link_type=abstract

Spitzer Proposal ID #20713

Computer Science

Scientific paper

The RS CVn class of close binaries have an IR excess occurrence rate of 40% - more than twice as high as that for main-sequence stars or first ascent giants. These excesses are a mystery: the stars are generally older than the 400 Myr lifetime of dusty disks around MS stars, and stellar evolution does not predict substantial mass loss at their evolutionary phase. Spitzer IRAC and MIPS imaging and photometry of 10 nearby systems can distinguish between the competing models: long-lived dusty disks; new mass loss episodes at the subgiant or Hertzsprung gap phase; or magnetically-driven stellar winds and coronal mass ejections 100 times more massive than currently thought. The answers are important for understanding dusty disks, stellar magnetic activity, and for the evolution of close binary systems.

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