Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...280..671a&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 280, May 15, 1984, p. 671-678.
Astronomy and Astrophysics
Astrophysics
92
Binary Stars, Nonthermal Radiation, O Stars, Radiant Flux Density, Radio Stars, Stellar Radiation, Stellar Winds, B Stars, Early Stars, Radial Velocity, Radio Emission, Thermal Radiation, Wolf-Rayet Stars
Scientific paper
The stars 9 Sgr (O4 V) and Cyg OB2 No. 9 (O5f) were monitored over a 2 yr period at 2 cm, 6 cm, and 20 cm. A nonthermal source of unknown origin contributes most of the observed emission from both stars. Both sources coincide with the stellar optical position to within 0.15 arcsec, which effectively eliminates the possibility that the radio emission comes from an unrelated background source. Between 1982 October and 1983 May the nonthermal component from Cyg OB2 No. 9 turned off, leaving only the thermal emission from the stellar wind, which was observed. It is speculated that the nonthermal emission may come from accretion onto an undetected compact companion, which would provide the first evidence for the existence of a predicted class of 'X-ray-quiet' binary systems.
Abbott David C.
Bieging John H.
Churchwell Edward
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