MG II absolute line profiles for late-type stars and for spatially-resolved solar regions

Details MG II absolute line profiles for late-type stars and for spatially-resolved solar regions MG II absolute line profiles for late-type stars and for spatially-resolved solar regions

Mar 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...256..185c&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 256, no. 1, p. 185-194.

Astronomy and Astrophysics

Astrophysics

13

Chromosphere, Late Stars, Line Shape, Line Spectra, Metallicity, Solar Atmosphere, Iue, Magnesium, Spatial Resolution

Scientific paper

We present the results of a comparison of Mg II h and k line profiles and fluxes for late-type stars observed with IUE and for spatially resolved solar regions observed at comparable resolution by the NRL Spectrograph on Skylab. We show that the spatially resolved solar observations are in good agreement with the disk integrated stellar observations, thus suggesting that different Mg II emission levels observed in stars of similar spectral type are due to different fractions of their surface covered by magnetic regions. We confirm that the Mg II stellar fluxes are well correlated with other chromospheric and transition-region fluxes, and we show that the spatially resolved solar data obey the same flux-flux relationships as the stellar data with virtually the same slope. We compare some important line diagnostic parameters in disk integrated stellar data and in spatially resolved solar regions, finding no significant discrepancies between the two cases. We discuss the possibility and limitations of using the comparison of solar and stellar Mg II fluxes to infer the fraction of a star's surface covered by magnetic regions.

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