The shock-induced variability of emission profiles in S CAR

Details The shock-induced variability of emission profiles in S CAR The shock-induced variability of emission profiles in S CAR

Jul 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...148..155g&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 148, no. 1, July 1985, p. 155-164.

Astronomy and Astrophysics

Astrophysics

25

H Alpha Line, Shock Waves, Stellar Luminosity, Stellar Mass Ejection, Variable Stars, Absorption Spectra, Ballistic Trajectories, High Resolution, Light Curve, Line Spectra, Mira Variables, Stellar Spectrophotometry

Scientific paper

High resolution observations of H-beta, H-alpha, P-delta, Ca II, Ti I, Fe I, and K I emission and absorption lines of the bright Mira star S Car are reported. Throughout the whole luminosity period, the H-alpha profiles are strikingly variable. Ti I inverse P Cygni profiles are observed after luminosity minimum and interpreted as indicating important ballistic motions within the atmosphere of S Car. Double absorptions by K I, Fe I, and Ti I are demonstrated not to be real double lines as previously assumed in the literature and their classical interpretation is thus completely revised. The Ca II inverse P Cygni profiles are also only apparent and are the consequence, like the double lines, of ballistic motions near to the photosphere. A qualitative interpretation of all these observations in the framework of the single spherical shock theory developed for Omicron Ceti is given. In S Car, the shock front velocity varies with phase and is relatively high at luminosity maximum (approximately 90 km/s). During a luminosity period, the shock runs over only half the stellar radius and thus does not leave the dense atmosphere.

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