Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...110..272s&link_type=abstract
Astronomy and Astrophysics, vol. 110, no. 2, June 1982, p. 272-280.
Astronomy and Astrophysics
Astrophysics
29
A Stars, High Dispersion Spectrographs, Magellanic Clouds, Spectral Energy Distribution, Stellar Spectra, Variable Stars, Balmer Series, H Lines, Stellar Mass Ejection, Supergiant Stars
Scientific paper
Extensive high-dispersion spectroscopy of the luminous Hubble-Sandage variable S Dor was carried out during its maximum phase from 1973 to 1981 at ESO, La Silla. The spectrum is characterized by strong P Cygni type profiles of the Balmer lines H-alpha to H9 and of singly ionized metallic lines. Attention is given to the considerable spectroscopic variations occurring during the maximum phase. The continuum energy distribution can be explained by a superposition of an early A-type supergiant photospheric energy distribution and the radiation of a dense, rather cool envelope. The terminal velocity of the envelope is low (132 km/s) and seems to be reached rapidly in the inner parts of the envelope. The mass loss of S Dor during maximum phase was found to be approximately 0.00005 solar mass per year.
Stahl Otmar
Wolf Bernd
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