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
复制标题
银河系中心快速移动恒星S2的本质
DOI:
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复制
发表时间:
2007
期刊:
影响因子:
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通讯作者:
Berkeley
中科院分区:
文献类型:
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作者:
F. Martins;S. Gillessen;F. Eisenhauer;R. Genzel;T. Ott;S. M. Garching;Berkeley
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.
影响因子:
6.5
作者:
Dufton P
通讯作者:
Dufton P