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

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

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011bsrsl..80..709n&link_type=abstract

Société Royale des Sciences de Liège, Bulletin, vol. 80, p. 709-713 (Proceedings of the 39th Liège Astrophysical Colloquium, hel

Astronomy and Astrophysics

Astrophysics

1

Scientific paper

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.

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