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arXiv 0908.3751astro-ph.SRastro-ph.EP
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vB 10的红外径向速度

Infrared radial velocities of vB 10

M. R. Zapatero Osorio, E. L. Martin, C. del Burgo, R. Deshpande, M. M. Montgomery

摘要:

我们目前的径向速度的M8 V型,非常低的质量恒星VB 10已获得在2001年和2008年之间的四个不同时期的观测。我们使用高分辨率(R ~ 20,000)近红外(J波段)光谱与凯克II望远镜上的NIRSPEC仪器。我们的数据表明,vB 10的径向速度变化幅度约为1 km/s,这一结果与Pravdo & Shaklan(2009)最近发现的恒星周围有一颗大质量行星伴星的结果一致。需要更多的速度测量和更好的轨道相位采样,以精确地限制轨道参数和对的单个质量。

英文摘要:

We present radial velocities of the M8V-type, very low-mass star vB 10 that have been obtained at four different epochs of observations between 2001 and 2008. We use high-resolution (R ~ 20,000) near-infrared (J-band) spectra taken with the NIRSPEC instrument on the Keck II telescope. Our data suggest that vB 10 shows radial velocity variability with an amplitude of ~1 km/s, a result that is consistent with the recent finding of a massive planet companion around the star by Pravdo & Shaklan (2009). More velocity measurements and a better sampling of the orbital phase are required to precisely constrain the orbital parameters and the individual masses of the pair.

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