Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...219..239r&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 219, no. 1-2, July 1989, p. 239-252. Research supported by ASTRON, NWO, and Sa
Astronomy and Astrophysics
Astrophysics
45
Cool Stars, Dwarf Stars, Late Stars, M Stars, Stellar Magnetic Fields, Stellar Radiation, Chromosphere, H Alpha Line, Radiant Flux Density, Spectral Line Width, Stellar Activity
Scientific paper
Consideration is given to emission from the outer atmospheres of M-type dwarfs in several spectral lines originating from the chromosphere, the transition-region, and the soft X-ray emission from the corona. It is shown that M-type dwarfs systematically deviate from relations between flux densities in soft X-rays and chromospheric and transition-region emission lines. The quantitative relation between the equivalent width of H-alpha and the Ca II, H, and K emission index is determined. It is suggested that the emission in the Balmer spectrum may result from back heating by coronal soft X-rays.
Duncan Douglas K.
Mewe Rolf
Rutten Rene G. M.
Schrijver Carolus J.
Zwaan Cornelis
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