Chromospheric variability of M giant semiregular variables

Details Chromospheric variability of M giant semiregular variables Chromospheric variability of M giant semiregular variables

Nov 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...364..259e&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 364, Nov. 20, 1990, p. 259-265. Research supported by the Research Corp.

Astronomy and Astrophysics

Astrophysics

6

Chromosphere, Giant Stars, M Stars, Semiregular Variable Stars, High Dispersion Spectrographs, Iue, Stellar Atmospheres, Stellar Luminosity, Stellar Oscillations

Scientific paper

The results of monitoring the chromospheric emission from three M giant semiregular variables, W Cyg, NU Pav, and Theta Aps at low dispersion with the IUE satellite are reported along with high-dispersion IUE spectra for R Lyr and Delta(2) Lyr. The chromospheric emission is variable in all of the first three stars, and the Mg II strength generally follows changes in the continuum. However, the changes are not directly proportional, and there is a phase lag between the emission in the continuum and that in the Mg II lines, at least in W Cyg and probably in NU Pav. R Lyr showed changes in Mg II lines strengths and profiles uncorrelated with Al II 2669 A strength or with the strengths of fluorescent Fe I lines. The chromospheres of all these stars are clearly modified by stellar pulsation. The position and extent of the emitting layers of the chromospheres of the stars are estimated.

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