SIMBAD references

2010ApJ...719..634N - Astrophys. J., 719, 634-641 (2010/August-2)

First orbital solution for the non-thermal emitter Cyg OB2 no. 9.

NAZE Y., DAMERDJI Y., RAUW G., KIMINKI D.C., MAHY L., KOBULNICKY H.A., MOREL T., DE BECKER M., EENENS P. and BARBIERI C.

Abstract (from CDS):

After the first detection of its binary nature, the spectroscopic monitoring of the non-thermal radio emitter Cyg OB2 No. 9 (P = 2.4 yr) has continued, doubling the number of available spectra of the star. Since the discovery paper of 2008, a second periastron passage has occurred in 2009 February. Using a variety of techniques, the radial velocities could be estimated and a first, preliminary orbital solution was derived from the He I λ5876 line. The mass ratio appears close to unity and the eccentricity is large, i.e., 0.7-0.75. X-ray data from 2004 and 2007 are also analyzed in quest of peculiarities linked to binarity. The observations reveal neither large overluminosity nor strong hardness, but it must be noted that the high-energy data were taken after the periastron passage, at a time where colliding wind emission may be low. Some unusual X-ray variability is however detected, with a 10% flux decrease between 2004 and 2007. To clarify their origin and find a more obvious signature of the wind-wind collision, additional data, taken at periastron and close to it, are needed.

Abstract Copyright:

Journal keyword(s): binaries: spectroscopic - stars: early-type - stars: emission-line, Be - stars: individual: Cyg OB2 No. 9 (read: Schulte 9) - X-rays: stars

Status at CDS:  

Simbad objects: 8

goto Full paper

goto View the reference in ADS

To bookmark this query, right click on this link: simbad:2010ApJ...719..634N and select 'bookmark this link' or equivalent in the popup menu


2020.06.03-22:43:48

© Université de Strasbourg/CNRS

    • Contact