On the Nature of the Fast-Moving Star S2 in the Galactic Center

On the Nature of the Fast-Moving Star S2 in the Galactic Center
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银河系中心快速移动恒星S2的本质

DOI:
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发表时间:
2007
期刊:
影响因子:
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通讯作者:
Berkeley
Berkeley
中科院分区:
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文献类型:
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作者:
F. Martins;S. Gillessen;F. Eisenhauer;R. Genzel;T. Ott;S. M. Garching;Berkeley

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我们分析了围绕银河系中心超大质量黑洞运行的恒星S2的性质。通过2004-2007年间23.5小时的联合观测获得的高质量SINFONI H带和K带光谱表明,S2是一颗早期的B矮星(B0-B2.5V)。使用模型大气,我们约束了它的恒星和风的性质。我们证明了S2是一颗真正的大质量恒星,而不是像人们有时推测的那样,是一颗剥离巨星的核心,以解决离超大质量黑洞如此近的恒星形成的问题。我们给出了它的质量损失率的上限,并表明它是富集的,可能是因为磁场的存在。
We analyze the properties of the star S2 orbiting the supermassive black hole at the center of the Galaxy. A high-quality SINFONI H- and K-band spectrum obtained from co-adding 23.5 hr of observation between 2004 and 2007 reveals that S2 is an early B dwarf (B0-B2.5 V). Using model atmospheres, we constrain its stellar and wind properties. We show that S2 is a genuine massive star and not the core of a stripped giant star, as sometimes speculated to resolve the problem of star formation so close to the supermassive black hole. We give an upper limit on its mass-loss rate and show that it is He enriched, possibly because of the presence of a magnetic field.
大质量恒星的 VLT-FLAMES 巡天:NGC 3293、NGC 4755 和 NGC 6611 中的恒星参数和旋转速度
DOI: 10.1051/0004-6361:20065392
发表时间: 2006
影响因子: 6.5
作者:
Dufton P
通讯作者: Dufton P