منابع مشابه
New very massive stars in Cygnus OB2
Context. The compact association Cygnus OB2 is known to contain a large population of massive stars, but its total mass is currently a matter of debate. While recent surveys have uncovered large numbers of OB stars in the area around Cyg OB2, detailed study of the optically brightest among them suggests that most are not part of the association. Aims. We observed an additional sample of optical...
متن کاملA New TeV Source in the Vicinity of Cygnus OB2
TeV Observations (during 1999, 2000 & 2001) of the Cygnus region using the HEGRA stereoscopic system of air Cherenkov telescopes have serendipitously revealed a signal positionally inside the core of the OB association Cygnus OB2, and ∼ 0.5◦ north of Cyg X-3. The source appears steady, has a post-trial significance of +4.6σ, indication for extension with radius 5.6′ at the ∼ 3σ level, and has a...
متن کاملNew Very Massive Stars in Cygnus Ob2 Journal Article Astrophysics New Very Massive Stars in Cygnus Ob2
Context. The compact association Cygnus OB2 is known to contain a large population of massive stars, but its total mass is currently a matter of debate. While recent surveys have uncovered large numbers of OB stars in the area around Cyg OB2, detailed study of the optically brightest among them suggests that most are not part of the association. Aims. We observed an additional sample of optical...
متن کاملCygnus OB2 – a young globular cluster in the Milky Way
The morphology and stellar content of the Cygnus OB2 association has been determined using 2MASS infrared observations in the J , H , and K bands. The analysis reveals a spherically symmetric association of ∼ 2◦ in diameter with a half light radius of 13′, corresponding to Rh = 6.4 pc at an assumed distance of 1.7 kpc. The interstellar extinction for member stars ranges from AV ≈ 5m to 20m, whi...
متن کاملNew Very Massive Stars in Cygnus Ob2 Journal Article
Context. The compact association Cygnus OB2 is known to contain a large population of massive stars, but its total mass is currently a matter of debate. While recent surveys have uncovered large numbers of OB stars in the area around Cyg OB2, detailed study of the optically brightest among them suggests that most are not part of the association. Aims. We observed an additional sample of optical...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2016
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361/201527517