Doppler imaging of magnetically-active stars

Details Doppler imaging of magnetically-active stars Doppler imaging of magnetically-active stars

Feb 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000noao.prop...44s&link_type=abstract

NOAO Proposal ID #2000A-0044

Physics

Scientific paper

Recent images from our KPNO Coude-feed program of long-period spotted giant stars showed the largest surface spots yet discovered. Spots sixty times larger than the entire Sun were recorded. In this proposal, we will attempt to continue the mapping of further candidate stars. The new targets are selected from the just finished Vienna-KPNO Ca II H& K survey (also done at the Coude feed) which discovered 371 new active stars and produced twenty new Doppler-imaging candidates. Some of these stars are the targets of this proposal. If the proposed targets of M-K class IV and III indeed also show such large spots at intermediate and/or high latitudes as suggested from our previous images, the solar-based flux-tube model of Schussler et al. for the origin of starspots must be reconsidered.

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