The line H-alpha in chromospheric diagnostics

Details The line H-alpha in chromospheric diagnostics The line H-alpha in chromospheric diagnostics

Jul 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987afz....26...61k&link_type=abstract

(Astrofizika, vol. 26, Jan.-Feb. 1987, p. 61-67) Astrophysics (ISSN 0571-7132), vol. 26, no. 1, July 1987, p. 35-39. Translation

Astronomy and Astrophysics

Astrophysics

Chromosphere, Giant Stars, H Alpha Line, Photosphere, Stellar Models, Atmospheric Models, Atmospheric Pressure, Atmospheric Temperature, Balmer Series, Late Stars, Spectral Line Width

Scientific paper

The profile of the line H-alpha is investigated on the basis of a chromospheric and photospheric model of Arcturus (Alpha Boo, K2 III). It is shown that the central parts of the line are formed in the upper part of the chromosphere and in the transition region. From the width of the line H-alpha it is possible to determine the nonthermal velocity of the gas at the base of the transition region. The H-alpha profile depends weakly on the temperature and pressure in the chromosphere. From the appearance of an emission core in the theoretical H-alpha profiles it is possible to estimate an upper limit of the pressure at the base of the transition region.

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