Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...192..206g&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 192, no. 1-2, March 1988, p. 206-220.
Astronomy and Astrophysics
Astrophysics
21
Balmer Series, Emission Spectra, Mira Variables, Stellar Spectra, Shock Waves, Spectrum Analysis, Stellar Composition, Stellar Luminosity, Stellar Models
Scientific paper
High resolution (4.3 km/s or R = H-gamma 70,000) profiles of Balmer emission at luminosity maximum from H-alpha to H 12 of the bright and hot Mira star S Car are reported. Only H-alpha and H-beta show double-emission structure whereas H-gamma-H 12 present strong asymmetric profiles. All these emissions are interpreted in the framework of a single spherical shock model propagating above the photosphere. The double-emission structure is interpreted either as the variation of the optical depth in the shock deexcitation zone (geometric model) or as a true absorption, caused by the presence of cool hydrogen above the shock front (self-reversal model). The strong departure of the emission intensity from LTE conditions is understood as the consequence of the TiO line absorption together with hydrogen scattering. The weakening of the redshifted hydrogen emission component as the phase advances is interpreted as an enlargement of the atmospheric absorption.
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