Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...291..805w&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 291, no. 3, p. 805-810
Astronomy and Astrophysics
Astronomy
27
Binary Stars, Interstellar Extinction, O Stars, Radio Astronomy, Stellar Envelopes, Stellar Winds, Wolf-Rayet Stars, Flux Density, Opacity, Radio Observation, Stellar Motions, Synchrotron Radiation
Scientific paper
New observations of the colliding wind Wolf-Rayet WC7+O4-5 binary HD 193793 (WR 140) at 6 cm and 21 cm with the Westerbrook Synthesis Radio Telescope are presented. They show that the 21 cm flux, in particular, rose to a sharp maximum in 1992, lagging about a year behind the 6 cm flux. After maximum, both fell simultaneously. The data are interpreted in terms of the varying circumstellar extinction to a non-thermal source where the WC and O winds collide. The rising branch of the flux curve is determined mostly by extinction in the WC stellar wind and the fading branch mostly by that in the O star wind.
Spoelstra Titus A. Th.
van der Hucht Karel A.
Williams Peredur M.
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