A first orbital solution for the non-thermal radio emitter Cyg OB2 #9

Y. Nazé; Y. Damerdji; G. Rauw; D.C. Kiminki; L. Mahy; H.A. Kobulnicky; T. Morel; M. De Becker; P. Eenens; C. Barbieri

Bulletin de la Société Royale des Sciences de Liège

0037-9565 1783-5720

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Y. Nazé, Y. Damerdji, G. Rauw, D.C. Kiminki, L. Mahy, H.A. Kobulnicky, T. Morel, M. De Becker, P. Eenens & C. Barbieri

A first orbital solution for the non-thermal radio emitter Cyg OB2 #9

(Volume 80 - Année 2011)

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Abstract

We reported in 2008 the first detection of the binary nature of Cyg OB2 #9. Since then, we have continued our spectroscopic monitoring of this object, doubling the number of available spectra of the star while covering a second periastron passage. Using a variety of techniques, the radial velocities were estimated and a first, preliminary orbital solution was derived (P=2.4 yrs). The mass ratio appears close to unity and the eccentricity is large, 0.7-0.75.

To cite this article

Y. Nazé, Y. Damerdji, G. Rauw, D.C. Kiminki, L. Mahy, H.A. Kobulnicky, T. Morel, M. De Becker, P. Eenens & C. Barbieri, «A first orbital solution for the non-thermal radio emitter Cyg OB2 #9», Bulletin de la Société Royale des Sciences de Liège [En ligne], Volume 80 - Année 2011, 709 - 713 URL : http://popups.ulg.be/0037-9565/index.php?id=3182.