Low-resolution MG II H and K observations of solar type stars

Details Low-resolution MG II H and K observations of solar type stars Low-resolution MG II H and K observations of solar type stars

Oct 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...261..220b&link_type=abstract

Astrophysical Journal, Part 1, vol. 261, Oct. 1, 1982, p. 220-227.

Astronomy and Astrophysics

Astrophysics

3

Chromosphere, Dwarf Stars, G Stars, Magnesium, Metallic Stars, Spectral Resolution, Ultraviolet Spectra, Calcium, Emission Spectra, F Stars, Giant Stars, Hydrogen, Iue, Line Spectra, Potassium, Radiative Heat Transfer, Star Clusters, Stellar Spectrophotometry, Stellar Temperature, Supergiant Stars

Scientific paper

Observations with the International Ultraviolet Explorer (IUE) have made possible a comparison between chromospheric radiative loss rates in the Mg II h and k lines and the Ca II H and K lines. Observations made by Stencel et al. (1980) confirm the findings of Linsky et al. (1979) that the chromospheric radiative loss rates in h and k and H and K are about equal for supergiants, but the h and k loss rate is greater than the H and K loss rate in giants. It is pointed out that this may result from physical differences between the lower chromospheres of giants and supergiants. The present investigation has the objective to explore the possibility of determining relative chromospheric radiative loss rates in F and G dwarf stars with low-resolution IUE spectra. It is found that this is possible. Cluster stars were selected to provide two temperature sequences at two slightly different metal abundances.

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