Physics
Scientific paper
Feb 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007noao.prop...49r&link_type=abstract
NOAO Proposal ID #2007A-0049
Physics
Scientific paper
Only a few years ago, theoretical expectation was that magnetic activity would disappaer beyond spectral type M5. While we now know that stellar magnetic activity in fact exists in some late-M and L dwarfs, only a single such object has been observed simultaneously in all relevant bands: optical, radio, and X-rays. Thus, the ubiquity and detailed physics of coronae and magnetic dynamos remain largely unexplored. This problem is further exacerbated by the shift from persistent to flaring emission, whose properties are poorly characterized due to the lack of simultaneous observations. It is therefore time to produce a complete picture of the coronae and chromospheres in ultracool dwarfs, and directly implicate magnetic fields in this activity. Here we propose to delineate the underlying physics of the magnetic activity with fully simultaneous spectroscopic observations using GMOS-N of three late-M dwarfs already approved for simultaneous observations with Chandra and the VLA.
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