Chromosphere emission in late main sequence stars of different masses and ages

Details Chromosphere emission in late main sequence stars of different masses and ages Chromosphere emission in late main sequence stars of different masses and ages

Sep 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esasp.263...61m&link_type=abstract

In ESA Proceedings of an International Symposium on New Insights in Astrophysics. Eight Years of UV Astronomy with IUE p 61-64

Astronomy and Astrophysics

Astrophysics

1

Chromosphere, Emission Spectra, Late Stars, Main Sequence Stars, Stellar Evolution, Stellar Mass, Stellar Spectra, Abundance, Iue, Stellar Composition, Stellar Luminosity

Scientific paper

Results on observations of emission components in the H and K lines of Ca II and in the h and k lines of Mg II of main sequence late type stars, belonging to the young Hyades and Coma clusters and the old moving groups, Zeta Her, epsilon Ind, sigma Pup, and Arcturus are presented. An approach to obtain integrated emission fluxes of Mg II lines from IUE low resolution spectra of solar and late type MS stars is proposed. From a preliminary analysis of the Ca II and Mg II emission luminosity, the relation L(chrom) alpha mass upsilon is found to be valid at least for young cluster stars, with upsilon = 4.34 for the Hyades. A probable dependence of the chromospheric emission luminosity from the metallic abundance in the old disk population stars is discussed.

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