Hipparcos, VLA and CCD Observations of CYG OB2 No. 5

Details Hipparcos, VLA and CCD Observations of CYG OB2 No. 5 Hipparcos, VLA and CCD Observations of CYG OB2 No. 5

Aug 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997esasp.402..401c&link_type=abstract

Proceedings of the ESA Symposium `Hipparcos - Venice '97', 13-16 May, Venice, Italy, ESA SP-402 (July 1997), p. 401-404

Computer Science

Scientific paper

Cyg OB2 No. 5 (BD+40deg4220; V729 Cyg) is known to be a contact binary system formed by two O-type stars. For this object a 6-cm radio emission has been detected at the optical position as well as an additional weak non-thermal radio source located at ~ 0.9 arcsec to the north east of the contact binary. It has been suggested that this radio component was possibly a third stellar object in the system. This was the first time that a radio companion was observed to be associated with the contact binary system. In this work we present new radio, CCD and Hipparcos observations that provide the basis for a plausible explanation of the origin of the non-thermal radiation emitted by the `third' component of this system and its nature.

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