Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...190..200g&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 190, no. 1-2, Jan. 1988, p. 200-214.
Astronomy and Astrophysics
Astrophysics
15
H Alpha Line, Mira Variables, Propagation Velocity, Shock Wave Propagation, Emission Spectra, Photosphere, Radial Velocity
Scientific paper
New high resolution (5 - 14 km s-1) profiles of Hα emission of eight bright Mira stars are reported. The observations suggest that the nature of the Hα-double structure is common to all Mira stars. The origin of the absorption within the Hα emission is discussed. Presently, two interpretations seem plausible. There are the Hα self-reversal model (Bidelman and Ratcliffe, 1954) and the geometric model (Willson, 1976) in which the shock runs far above the photosphere. The origin of the large Hα width is also discussed. It can be due to Hα scattering or it may be the consequence of a high shock velocity. In the framework of these models, the author discusses the estimation of the shock front velocity.
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