Computer Science
Scientific paper
Mar 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985msngr..39...38g&link_type=abstract
ESO Messenger (ISSN 0722-6691), March 1985, p. 38-40.
Computer Science
1
Absorption Spectra, Emission Spectra, Mira Variables, Shock Wave Propagation, Stellar Atmospheres, Stellar Spectra, Variable Stars, H Alpha Line, Infrared Spectra, Line Spectra, Photosphere, Stellar Models
Scientific paper
Empirical models explaining the double H-alpha emission line and absorption-line doubling seen in the spectra of Mira variables are discussed on the basis of ESO coude echelle spectrometer observations of Omicron Cet (Gillet et al., 1983) and S Car (Gillet et al., 1985). Typical spectra are shown, and the strong absorption seen at the H-alpha wavelength in the blueshifted spectra is found to be apparent in nature, the result of geometric effects associated with the 70-80-km/s propagation of the shock front in the stellar atmosphere. The P-Cyg-type profiles of Ca II and Ti I and the profile of Fe I seen in the near IR just after maximum luminosity for S Car are found to originate near the photosphere and attributed to ballistic motions resulting from shock-wave propagation (rather than the presence of two components, as proposed by Wing, 1980).
Bouchet Patrice
Ferlet Roger
Gillet Denis
Maurice Eric
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