Time-variable, excess radio emission from CYG OB2 No. 5

Details Time-variable, excess radio emission from CYG OB2 No. 5 Time-variable, excess radio emission from CYG OB2 No. 5

Jan 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...142..263p&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 142, no. 2, Jan. 1985, p. 263-267. Sponsorship: Consejo Nacional de Ciencia y

Astronomy and Astrophysics

Astronomy

21

Infrared Spectrophotometers, Light Curve, O Stars, Radio Sources (Astronomy), Radio Spectra, Stellar Winds, Antenna Arrays, Cygnus Constellation, Flux Density, Infrared Astronomy, Radio Astronomy

Scientific paper

VLA measurements of the 6 cm flux of Cyg OB2 No. 5 reveal that it has increased by a factor of 3 between 1980 and 1983. The spectral index of this excess radio emission is 0.2±0.1. The radio variability of this and other O-type stars recently reported appears to have time scales of months. The evidence of a 6.6 day periodicity found at 2.2 μm indicates that the IR variability observed in the contact binary system Cyg OB2 No. 5 originates from the eclipsing stars instead of from the expanding envelope. This result places important constraints on models where the mass loss rate of the star suffers changes. It is yet unclear if the radio emission has a thermal or a nonthermal nature. A model in terms of the ejection of a dense shell by the O-type stars is discussed.

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