Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...128..384g&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 128, no. 2, Dec. 1983, p. 384-390.
Astronomy and Astrophysics
Astrophysics
34
Emission Spectra, H Alpha Line, Mira Variables, Omicron Ceti Star, Shock Wave Propagation, Stellar Atmospheres, Stellar Spectra, Variable Stars, Doppler Effect, Molecular Absorption, Red Shift, Spherical Waves, Stellar Luminosity
Scientific paper
Observations of the H-alpha emission profile of Mira at phases between -0.05 and +0.60 are reported. At a resolution of 56 mA, two real emission components are distinguished, while the apparent number of components is larger due to superimposed variable molecular absorption lines. The second redshifted emission component appears at phase +0.14. A qualitative interpretation in the framework of the spherical shock theory is given. The redshifted emission is explained as due to the shock in the hemisphere opposite the observer. The shock is initially optically thick; it becomes gradually thinner as the phase increases. Comparison of the observations and the present interpretation is made with the models of Hinkle et al. (1982) and of Wilson et al. (1982).
Baade Dietrich
Gillet Denis
Maurice Eric
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