Problem of hydrogen emission lines in long-period variables

Details Problem of hydrogen emission lines in long-period variables Problem of hydrogen emission lines in long-period variables

Apr 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977azh....54..340b&link_type=abstract

Astronomicheskii Zhurnal, vol. 54, Mar.-Apr. 1977, p. 340-353. In Russian.

Astronomy and Astrophysics

Astronomy

2

H Lines, Shock Wave Propagation, Stellar Atmospheres, Stellar Models, Stellar Spectra, Variable Stars, Chromosphere, Doppler Effect, Emission Spectra, Mira Variables, Stellar Magnetic Fields

Scientific paper

Two models for emission-line formation in Mira-type long-period variables are examined: emission behind a shock front and chromospheric heating due to dissipation of acoustic and MHD waves. Calculations are performed which show that the shock-wave model encounters three specific difficulties and that the hypothesis of chromospheric heating by waves generated beneath the photosphere is inapplicable to Miras. A model is proposed whereby hydrogen emission lines originate in hot spots formed by the reconnection of oppositely directed magnetic-field lines in regions above the photosphere. It is found that both the absolute intensity of emission lines and their variation with a characteristic time scale of several days can be explained in the framework of this model.

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