Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26as...88....1m&link_type=abstract
Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 88, no. 1, April 1991, p. 1-17. Fondo Nacional de Ciencia y
Astronomy and Astrophysics
Astrophysics
8
Astronomical Spectroscopy, B Stars, Emission Spectra, Line Spectra, Stellar Envelopes, Stellar Spectra, Radial Velocity, Southern Sky, Spectrum Analysis, Stellar Rotation
Scientific paper
The results of spectroscopic observations of six B0-B4e and one B7e stars at the Manuel Foster Observatory (Chile) during 1984-87 are reported. By means of photographic spectroscopy (20 A/mm), equivalent widths, peak separations, and V/R ratios were obtained for a total of 106 H-beta and 7 H-gamma line profiles. Emission episodes in H-beta were detected in 27 CMa and Lambda Pav, lasting at least 5 months and 18 days respectively. Significant variations in the equivalent width of the H-beta emission line, W beta, in time scales of months were found in Kappa CMa, PP Car, and QY Car. On the other hand, Alpha Ara and Epsilon PsA showed a relatively constant strength of emission. The variations in W beta were interpreted as the cumulative effect of several individual ejections from the stellar surface with mass loss rates of the order of 10 to the -10th solar mass/yr.
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