Electron density in photospheres of F-G-K stars

Details Electron density in photospheres of F-G-K stars Electron density in photospheres of F-G-K stars

Nov 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976afz....12..647e&link_type=abstract

Astrofizika, vol. 12, Nov. 1976, p. 647-656. In Russian.

Astronomy and Astrophysics

Astronomy

Electron Density (Concentration), F Stars, G Stars, K Stars, Photosphere, Stellar Atmospheres, Stellar Spectra, Absorption Spectra, Iron, Spaceborne Astronomy, Spectral Line Width

Scientific paper

Measurements of the equivalent widths of the Fe II absorption line at 2755 A and the Fe I absorption line at 2967 A in Orion-2 UV spectra of more than 60 stars of spectral types F0 to K2 are used to construct an empirical relation between the ratio of the equivalent widths of the two iron absorption lines and stellar spectral type. The relation is applied to obtain upper limits on the electron density in the photospheres of stars in the cited spectral-type range. The results show that the electrom density is highest in photosphere of O5 stars and decreases continuously with progressively later spectral types; the gradient of the decrease is found to be very small in the interval from O5 to F0 and very large in the range from F0 to K2 and later

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