Model chromospheres of RS CVn stars - Balmer line profiles in Gamma Andromedae

Details Model chromospheres of RS CVn stars - Balmer line profiles in Gamma Andromedae Model chromospheres of RS CVn stars - Balmer line profiles in Gamma Andromedae

Publishing date

Apr 1982

URL

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...108..251m&link_type=abstract

Journals

Astronomy and Astrophysics, vol. 108, no. 2, Apr. 1982, p. 251-255.

Science

Astronomy and Astrophysics

Field

Astrophysics

Additional info 2

9

Additional info 3

Andromeda, Balmer Series, Chromosphere, Late Stars, Stellar Atmospheres, Stellar Models, Atmospheric Models, Atmospheric Pressure, H Alpha Line, High Pressure, Low Pressure, Magnetic Flux, Normal Density Functions, Spectral Line Width, Stellar Magnetic Fields

Type

Scientific paper

Abstract

Two models have been constructed for the chromosphere of the RS CVn star Gamma And, one with a low-pressure transition zone, and one with a high pressure transition zone. The high pressure model predicts an H alpha line profile which agrees fairly well with high resolution observations of Gamma And, without the need to include nonthermal line broadening. The low pressure model predicts an H alpha profile which agrees very well with the observations, after application of macroturbulent broadening with a gaussian velocity parameter of about 30 km/sec. Methods which could distinguish between the two alternatives are discussed, and it is suggested that if the low-pressure model is valid, the large macroturbulence may be associated with unstable magnetic flux loops in the atmosphere.

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