Thermal and non-thermal radio emission from Cygnus OB2 No. 5

Details Thermal and non-thermal radio emission from Cygnus OB2 No. 5 Thermal and non-thermal radio emission from Cygnus OB2 No. 5

Dec 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...240...93p&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 240, no. 1, Dec. 1990, p. 93-97.

Astronomy and Astrophysics

Astronomy

23

B Stars, Emission Spectra, O Stars, Radio Stars, Stellar Spectra, Stellar Winds, Eclipsing Binary Stars, Infrared Sources (Astronomy), Stellar Models

Scientific paper

A comprehensive radio and infrared monitoring of the luminous contact binary Cyg OB2 No. 5 spanning over eight years is presented. The 10 microns excess, attributed to free-free radiation in the expanding stellar wind, remains constant over this period, while the 6 cm continuum emission presented variations of a factor of 4.3 with timescales of months. The radio spectral index was also found to vary with time and was found to be positive from 2 to 6 cm while at the same time being negative from 6 to 20 cm. Both thermal and variable nonthermal radio emission components are present in this star.

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