Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.2105w&link_type=abstract
American Astronomical Society, AAS Meeting #211, #21.05; Bulletin of the American Astronomical Society, Vol. 39, p.772
Astronomy and Astrophysics
Astronomy
Scientific paper
H alpha and Ca II K are two of the strongest emission lines in M dwarf chromospheres, responsible for
cooling the atmosphere, balancing the magnetic heating, and determining the resulting equilibrium structure. To investigate the relationship between these two important lines, I captured simultaneous observations of Ca II K and H alpha for 85 dM3 stars of varying activity strength. The results of my observing program reveal a complex relationship between the two, where even so-called "inactive" stars (those with H alpha in absorption) may display substantial Ca II K emission. A new generation of quiescent model atmospheres is required to further investigate the chromospheric heating required to produce both of these lines at the observed levels. I present the observed results, and discuss their application as empirical constraints on static models of quiescent M dwarf atmospheres. I also present initial model calculations and place them in the context of the data.
Hawley Suzanne L.
Walkowicz Lucianne M.
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