High dispersion spectroscopy of the LMC star S Doradus mduring maximum light.
Abstract
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.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- June 1982
- Bibcode:
- 1982A&A...110..272S
- Keywords:
-
- A Stars;
- High Dispersion Spectrographs;
- Magellanic Clouds;
- Spectral Energy Distribution;
- Stellar Spectra;
- Variable Stars;
- Balmer Series;
- H Lines;
- Stellar Mass Ejection;
- Supergiant Stars;
- Astronomy