Ly-alpha and MG II H and K fluxes in a sample of dwarf M stars

Details Ly-alpha and MG II H and K fluxes in a sample of dwarf M stars Ly-alpha and MG II H and K fluxes in a sample of dwarf M stars

Feb 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...228..443d&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 228, no. 2, Feb. 1990, p. 443-446.

Astronomy and Astrophysics

Astrophysics

22

Dwarf Stars, Lyman Alpha Radiation, M Stars, Magnesium, Stellar Spectra, Chromosphere, Iue, Radiative Transfer, Stellar Models

Scientific paper

Ly-alpha and Mg II fluxes are given for a group of M dwarfs. The Ly-alpha and Mg II lines were extracted from low resolution spectra taken with the IUE satellite. The Ly-alpha line is shown to be an important source of radiative losses in dMe chromospheres, being at least a factor of two more important than Mg II. Overall it contributes approximately 25 percent of the total chromospheric losses, about the same as the more commonly observed H-alpha line. In order to have approximately equal contributions from these lines, one requires either a plateau region in the lower transition region or different filling factors for the two lines. In dM stars, Ly-alpha is approximately the same magnitude as Mg II.

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