Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...444..396w&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 444, no. 1, p. 396-404
Astronomy and Astrophysics
Astrophysics
6
Astronomical Spectroscopy, Emission Spectra, H Alpha Line, Mira Variables, S Stars, Stellar Spectra, H Beta Line, H Gamma Line, Radial Velocity, Stellar Oscillations
Scientific paper
High dispersion observations of the H alpha profile in S-type Mira stars have been obtained at a number of different phases. Because it is difficult to obtain wide phase coverage on individual stars (with typical periods of around 300 days), observations obtained from a number of different stars were combined and anylzed as if they were all from the same star. This procedure yielded quite consistent results. The profiles, considered by previous authors to consist of two components, have been modeled as the sum of three emission components of equal width, two of which are blended. Supplemental H beta anbd H gamma observations show a single feature close to the velocity of the middle H alpha emission component. The relative amplitudes of these components, as well as the velocity of the red component, vary smoothly with advancing phase. Although it is uncertain, the three components may correspond to physically distinct emitting regions.
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