Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975mnras.172..617g&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 172, Sept. 1975, p. 617-621.
Astronomy and Astrophysics
Astronomy
5
Chromosphere, Late Stars, Line Spectra, Stellar Spectra, Ultraviolet Spectra, Emissivity, Stellar Spectrophotometry, Stellar Temperature
Scientific paper
The emission lines 2800 Mg II and 3080 Ti II of chromospheric origin have been observed in the ultraviolet Orion-2 spectra of three, G5, K5 and M3 type, stars. This proves the existence of a chromosphere around these stars. The relative radiation powers of the 'magnesium' chromosphere for these stars, as well as for the three OAO-2 stars, are obtained. The data obtained strongly indicate the existence of stellar chromospheres in the late-type stars with the radiation power much higher than the radiative emissivity of the solar chromosphere. The relative emissivity of the stellar chromospheres itself is independent from the spectral type or effective temperature of the star.
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