Mechanism of excitation of chromospheric emission of pulsating stars of the type of Delta Scuti

Details Mechanism of excitation of chromospheric emission of pulsating stars of the type of Delta Scuti Mechanism of excitation of chromospheric emission of pulsating stars of the type of Delta Scuti

Sep 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986afz....25..251g&link_type=abstract

(Astrofizika, vol. 25, Sept.-Oct. 1986, p. 251-259) Astrophysics (ISSN 0571-7132), vol. 25, no. 2, March 1987, p. 498-503. Trans

Astronomy and Astrophysics

Astrophysics

3

Cepheid Variables, Chromosphere, Shock Wave Propagation, Stellar Oscillations, Atmospheric Ionization, Flux Density, Gas Heating, Iue, Magnesium, Temperature Distribution

Scientific paper

A mechanism is proposed to explain the occurrence and variability of the chromospheric emission in the center of the Mg II h and k lines in the spectra of pulsating stars of the type of Delta Scuti. According to the model, the emission is due to the radiation of gas heated by a shock wave propagating in the outer layers of the atmosphere of the star at phases near maximal light. The variability of the flux in the Mg II h and k lines is due to the motion of a shock wave in an inhomogeneous medium with decreasing density.

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