H-alpha observations of early-type stars

Details H-alpha observations of early-type stars H-alpha observations of early-type stars

Jun 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...392..201s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 392, no. 1, June 10, 1992, p. 201-208. Research supported by MURST.

Astronomy and Astrophysics

Astrophysics

26

Early Stars, H Alpha Line, Stellar Mass, Stellar Models, Supergiant Stars, Charge Coupled Devices, Emission Spectra, Stellar Winds

Scientific paper

Results are presented of a first session of a program run at the Catania Astrophysical Observatory to study and monitor the H-alpha emission from early-type stars, and the properties of their mass loss are determined. Twelve early-type supergiants in the Cygnus region were observed repeatedly in 1988 July. From these observations, evidence is found for short-term variability of the mass-loss rate. Also, a comparison with literature data reveals strong long-term variations for some of the stars. In addition, simplified models were developed to describe the H-alpha profile resulting from the combination of photospheric absorption with emission and scattering in the wind. By fitting the observed profiles with the models, the mass-loss rates and the velocity fields are determined for all stars with accuracies generally better than 25 percent.

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