Observations and Models of Quiescent M Dwarf Chromospheres

Details Observations and Models of Quiescent M Dwarf Chromospheres Observations and Models of Quiescent M Dwarf Chromospheres

Feb 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aipc.1094..696w&link_type=abstract

COOL STARS, STELLAR SYSTEMS AND THE SUN: Proceedings of the 15th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun.

Computer Science

2

Low Luminosity Stars, Subdwarfs, And Brown Dwarfs, Chromosphere, Stellar Activity

Scientific paper

Using simultaneous observations of the Hα and Ca II K lines for a sample of M3 dwarfs, we investigate the temperature structure required to produce the spectral signatures of chromospheric activity in low mass stars. Combined, the Hα and Ca II K data provide a rich set of observational challenges to theory. We apply these data as empirical constraints for new static models of quiescent M dwarf atmospheres. Using these models, we find that single component model atmospheres are able to provide a satisfactory description of weakly active M dwarfs, but more active stars require two component models, with different temperature structures for active and basal regions of the chromosphere.

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