Role of nonthermal velocity fields in determining the H-alpha widths in supergiant chromospheres

Details Role of nonthermal velocity fields in determining the H-alpha widths in supergiant chromospheres Role of nonthermal velocity fields in determining the H-alpha widths in supergiant chromospheres

Oct 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990pasp..102.1148m&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 102, Oct. 1990, p. 1148-1152.

Astronomy and Astrophysics

Astronomy

5

Chromosphere, H Alpha Line, Spectral Line Width, Supergiant Stars, Velocity Distribution, G Stars, K Stars, Radiative Transfer, Stellar Models, Stellar Spectra

Scientific paper

Radiative transfer calculations of the H-alpha line in spherically symmetric, expanding chromospheres explain the large widths of the line observed in late G and K supergiants. The role of various dynamical processes as well as that of opacity in determining the H-alpha width is illustrated. The H-alpha line profile is basically characterized by large optical depths and large Doppler broadening velocity. The calculations show that the existence of large microturbulence has to be invoked in the chromosphere to understand the observed widths.

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