Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...117...53v&link_type=abstract
Astronomy and Astrophysics, vol. 117, no. 1, Jan. 1983, p. 53-59.
Astronomy and Astrophysics
Astrophysics
16
A Stars, B Stars, Hertzsprung-Russell Diagram, Magellanic Clouds, O Stars, Stellar Luminosity, Stellar Spectrophotometry, Early Stars, Stellar Color, Stellar Envelopes, Stellar Mass Ejection, Stellar Temperature, Supergiant Stars
Scientific paper
A comparison is presented of the photometric characteristics of O to A0 stars of high luminosity in the Large Magellanic Cloud which exhibit or do not exhibit P Cygni characteristics. VBLUW observations were made of 29 OBA stars and 15 OBA stars with P Cygni characteristics (OBA/PC/ stars). Examination of the three two-color diagrams in the system indicates that the OBA(PC) stars are slightly bluer than the OBA stars, which may be explained by a higher luminosity for the OBA(PC) stars at a given temperature. Computations of the free-free emission from the extended envelopes of OBA(PC) stars show the contribution of such emission to the spectral energy distribution to be negligible in the absence of extreme conditions in the shell. Comparison of observed with theoretical colors reveals the reddening in OBA(PC) stars to be on the average 0.07 magnitudes greater than in OBA stars. Results suggest that OBA supergiants start to exhibit P Cygni characteristics when the mass loss rate becomes greater than or equal to 2 x 10 to the -6th solar mass/year.
Groot M.
Thé Pik-Sin
van Genderen Arnout M.
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