2004A&A...424L..39D

Query : 2004A&A...424L..39D

2004A&A...424L..39D - Astronomy and Astrophysics, volume 424, L39-42 (2004/9-4)

A Spectroscopic study of the non-thermal radio emitter CygOB2#8A: Discovery of a new binary system.

DE BECKER M., RAUW G. and MANFROID J.

Abstract (from CDS):

We present the results of a spectroscopic campaign revealing that the non-thermal radio emitter CygOB2#8A is an O6+O5.5 binary system. We propose the very first orbital solution indicating a period of about 21.9 days. The system appears to be eccentric (0.24±0.04) and is likely seen under a rather low inclination angle. The mass ratio of the components is close to unity. The impact of the binarity of this star in the framework of our understanding of non-thermal radio emission from early-type stars is briefly discussed.

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Journal keyword(s): binaries: spectroscopic - stars: early-type - stars: fundamental parameters - stars: individual: CygOB2#8A

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 BD+60 497 Y*O 02 31 57.0901516200 +61 36 43.948697940 10.466 9.39 8.85     O6.5V((f))+O8/B0V 104 0
2 [MT91] 213 Psr 20 32 13.1247390384 +41 27 24.346666440 13.12 13.08 11.266     B0Vp 290 0
3 Ass Cyg OB 2 As* 20 33.2 +41 19           ~ 943 0
4 BD+40 4227A SB* 20 33 15.0781182864 +41 18 50.479292556 10.42 10.27 8.98 8.03 6.83 O6Ib(fc)+O4.5:III:(fc) 246 0

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