Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9090h&link_type=abstract
HST Proposal ID #9090
Astronomy and Astrophysics
Astrophysics
Hst Proposal Id #9090 Cold Stars
Scientific paper
The origin of the magnetic heating which produces hot outer atmospheres in late-type stars is one of the most interesting, and elusive, problems in stellar astrophysics. Our poor understanding is due in part to the lack of data for a large and varied sample of stars, which are needed to provide the basis for a general theory. Observationally, our knowledge is particularly sparse for the very low mass stars. In fact, diametrically opposed conclusions have been reached in this field: the available data has been interpreted 1.} to indicate that magnetic heating of the hot transition region and corona becomes relatively more important in stars of later spectral type {lower mass} - the pre-1999 position; and 2.} to claim that the magnetic heating is insufficient to produce these regions at all, except during flares, in very low mass objects - the current widely held view. The manifestations of magnetic activity at the stellar/brown dwarf boundary have yet to be probed in transition region diagnostics; previous IUE and HST/GHRS observations were not sensitive enough to provide constraining data. Our proposed HST/STIS observations of three very low mass stars will conclusively show if quiescent magnetic heating sufficient to produce a hot outer atmosphere still exists in these objects, or whether they are categorically different than higher mass M dwarfs.
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