2008A&A...483..585V


C.D.S. - SIMBAD4 rel 1.7 - 2020.11.30CET23:04:21

2008A&A...483..585V - Astronomy and Astrophysics, volume 483, 585-590 (2008/5-4)

Non-thermal radio emission from O-type stars. III. Is Cygnus OB2 No. 9 a wind-colliding binary?

VAN LOO S., BLOMME R., DOUGHERTY S.M. and RUNACRES M.C.

Abstract (from CDS):

The star Cyg OB2 No. 9 is a well-known non-thermal radio emitter. Recent theoretical work suggests that all such O-stars should be in a binary or a multiple system. However, there is no spectroscopic evidence of a binary component. Re-analysis of radio observations from the VLA of this system over 25 years has revealed that the non-thermal emission varies with a period of 2.35±0.02yr. This is interpreted as a strong suggestion of a binary system, with the non-thermal emission arising in a wind-collision region. We derived some preliminary orbital parameters for this putative binary and revised the mass-loss rate of the primary star downward from previous estimates.

Abstract Copyright:

Journal keyword(s): stars: individual: Cyg OB2 No. 9 - stars: early-type - stars: mass-loss - radiation mechanisms: non-thermal

CDS comments: Table A1 : Notes : Several sources not identified.

Simbad objects: 11

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Number of rows : 11

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 RX J015720.8+375632 X 01 57 20.9 +37 56 32           ~ 2 0
2 V* V712 Car bL* 10 23 58.0120989646 -57 45 48.938103165 15.466 15.473 13.5 12.6   O3If*/WN6+O3If*/WN6 148 1
3 QSO B2005+40 QSO 20 07 44.9443187008 +40 29 48.601470737   18.5 19 20.3   ~ 272 1
4 HD 193793 WR* 20 20 27.9763345925 +43 51 16.289775091 6.90 7.25 6.85 4.58   WC7p+O5 654 1
5 BD+40 4212 EB* 20 31 37.5055016113 +41 13 20.999123545 12.46 11.5 10.214     O9: 70 1
6 BD+40 4220 EB* 20 32 22.4241357648 +41 18 18.942382590 11.32 10.79 9.185     O6.5-7f+O5.5-6f 372 0
7 V* V1521 Cyg HXB 20 32 25.78 +40 57 27.9           WN4/5-6/7 1787 2
8 Schulte 9 s*b 20 33 10.7366753544 +41 15 08.222187463 13.38 12.77 10.96     O4.5If 209 0
9 Ass Cyg OB 2 As* 20 33.2 +41 19           ~ 810 0
10 BD+40 4227A SB* 20 33 15.0780900764 +41 18 50.478859468 10.42 10.27 8.98 8.03 6.83 O6Ib(fc)+O4.5:III:(fc) 219 0
11 EM* AS 431 WR* 20 36 43.6345223872 +40 21 07.453291511       12.51   WN8(h)+B0.5V 211 0

    Equat.    Gal    SGal    Ecl

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2020.11.30-23:04:21

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