Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...224..179m&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 224, no. 1-2, Oct. 1989, p. 179-186.
Astronomy and Astrophysics
Astronomy
28
Dwarf Stars, K Stars, M Stars, Metallicity, Stellar Spectra, X Ray Astronomy, Magnesium, Radiant Flux Density
Scientific paper
Surface X-ray and Mg II h and k fluxes are presented for a group of dMe, dKe, dM, and dK stars. No correlation is apparent between the fluxes for the group of stars as a whole, although a good correlation is present for a subgroup, i.e., the dMe/dKe's. The Mg II and X-ray luminosities for these active stars define an upper boundary, which is dependent upon the stellar radii. The Mg II luminosity from the less active dM/dK stars are also radii-dependent, but this is not the case for the X-ray luminosity. This may indicate a difference in the heating mechanisms for the chromosphere and corona, with acoustic wave heating being an important contributor in the chromosphere and/or a difference in the plage filling factors in the two regions.
Doyle Gerry J.
Mathioudakis Michail
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