A spectroscopic study of the non-thermal radio emitter Cyg OB2#8A: Discovery of a new binary system

被引：56
|
作者：
De Becker, M [1 ]
Rauw, G [1 ]
Manfroid, J [1 ]
机构：
[1] Univ Liege, Inst Astrophys & Geophys, B-4000 Sart Tilman Par Liege, Belgium
来源：
ASTRONOMY & ASTROPHYSICS | 2004年 / 424卷 / 03期
关键词：
binaries : spectroscopic; stars : early-type; stars : fundamental parameters; stars : individual : Cyg OB2#8A;
D O I：
10.1051/0004-6361:200400049
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We present the results of a spectroscopic campaign revealing that the non-thermal radio emitter Cyg OB2 #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.
引用
收藏
页码：L39 / L42
页数：4
相关论文
共 16 条
  • [1] A binary signature in the non-thermal radio-emitter Cyg OB2 #9
    Naze, Y.
    De Becker, M.
    Rauw, G.
    Barbieri, C.
    [J]. ASTRONOMY & ASTROPHYSICS, 2008, 483 (02) : 543 - 546
  • [2] A binary signature in the non-thermal radio-emitter Cyg OB2 #9: (Research note)
    Nazé, Y.
    De Becker, M.
    Rauw, G.
    Barbieri, C.
    [J]. Astronomy and Astrophysics, 2008, 483 (02): : 543 - 546
  • [3] XMM-Newton observations of the massive colliding wind binary and non-thermal radio emitter Cyg OB2#8A [O6If+O5.5III(f)]
    De Becker, M.
    Rauw, G.
    Sana, H.
    Pollock, A. M. T.
    Pittard, J. M.
    Blomme, R.
    Stevens, I. R.
    Van Loo, S.
    [J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2006, 371 (03) : 1280 - 1294
  • [4] Non-thermal emission in Cyg OB2
    Fenech, D.
    Morford, J.
    Prinja, R.
    [J]. FORMATION, EVOLUTION, AND SURVIVAL OF MASSIVE STAR CLUSTERS, 2017, 12 (S316): : 139 - 140
  • [5] 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.
    Barbieri, C.
    [J]. ASTROPHYSICAL JOURNAL, 2010, 719 (01): : 634 - 641
  • [6] ON THE SIZE OF THE NON-THERMAL COMPONENT IN THE RADIO EMISSION FROM CYG OB2 #5
    Rodriguez, Luis F.
    Gomez, Yolanda
    Loinard, Laurent
    Mioduszewski, Amy J.
    [J]. REVISTA MEXICANA DE ASTRONOMIA Y ASTROFISICA, 2010, 46 (02) : 215 - 219
  • [7] EXTENDED NON-THERMAL EMISSION POSSIBLY ASSOCIATED WITH CYG OB2 #5
    Ortiz-Leon, Gisela N.
    Rodriguez, Luis F.
    Tapia, Mauricio
    [J]. REVISTA MEXICANA DE ASTRONOMIA Y ASTROFISICA, 2012, 48 (01) : 85 - 93
  • [8] Non-thermal radio emission from colliding-wind binaries: modelling Cyg OB2 No. 8A and No. 9
    Volpi, Delia
    Blomme, Ronny
    De Becker, Michael
    Rauw, Gregor
    [J]. ACTIVE OB STARS: STRUCTURE, EVOLUTION, MASS-LOSS, AND CRITICAL LIMITS, 2011, (272): : 638 - +
  • [9] A NEW NON-THERMAL GALACTIC RADIO-SOURCE WITH A POSSIBLE BINARY-SYSTEM
    FURST, E
    REICH, W
    REICH, P
    SOFUE, Y
    HANDA, T
    [J]. NATURE, 1985, 314 (6013) : 720 - 721
  • [10] THE NON-THERMAL, TIME-VARIABLE RADIO EMISSION FROM Cyg OB2 #5: A WIND-COLLISION REGION
    Ortiz-Leon, Gisela N.
    Loinard, Laurent
    Rodriguez, Luis F.
    Mioduszewski, Amy J.
    Dzib, Sergio A.
    [J]. ASTROPHYSICAL JOURNAL, 2011, 737 (01):
12