Externally Induced or Internally Produced: What is the Source of the Extreme Magnetic Activity Observed in Very Low Mass Stars?

Details Externally Induced or Internally Produced: What is the Source of the Extreme Magnetic Activity Observed in Very Low Mass Stars? Externally Induced or Internally Produced: What is the Source of the Extreme Magnetic Activity Observed in Very Low Mass Stars?

Feb 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008noao.prop...95h&link_type=abstract

NOAO Proposal ID #2008A-0095

Computer Science

Scientific paper

Recent observations of the very low mass donor stars in short period interacting binaries have revealed the presence of active chromospheres. Our group has obtained initial spectra for five such systems to date and found evidence of stellar activity in all of them, including a brown dwarf mass (0.055 M-sun) donor star. The Washington group has obtained a SDSS sample of a number of close, but non-interacting white dwarf + red dwarf binaries and find H(alpha) emission related to activity. We plan to perform the first detailed phase-resolved spectroscopic study of the active chromospheres in this set of rapidly rotating (<0.3 day), low mass (<0.25 M-sun), fully convective late-type stars and brown dwarfs. Our observational goals are to study the extent, nature and short-term changes of these active chromospheres on the low mass stars of close binaries. Is the extreme activity caused by the low mass star itself or externally driven by tidal or magnetic forces? The long term goals are to complete a large enough sample (~10 systems) to provide statistically useful measurements and to use the extended time allocation to obtain long term ``coverage" spectra of each system to monitor, measure, and understand the solar-type cycles likely to be present.

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