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arXiv 0707.3604astro-ph
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SDSS中一个新的低质量双星- II

A New Low-Mass Eclipsing Binary from SDSS-II

Cullen H. Blake, Guillermo Torres, Joshua S. Bloom, B. Scott Gaudi

摘要:

我们提出了一个新的低质量双线食双星系统的观测发现使用重复观测的天球赤道从斯隆数字巡天II。我们用近红外光度法和光谱法测量了这个短周期[P=0.407037(14)d]系统及其两个组分的性质。我们发现这两个分量的参数为:M_1=0.272+/-0.020 M_sun,R_1=0.268+/-0.010 R_sun,M_2=0.240+/-0.022M_sun,R_2 =0.248+/-0.0090 R_sun,T_1=3320+/-130K,T_2 =3300+/-130K。这个系统的两个组成部分的质量和半径与基于低质量恒星模型的理论预期吻合得很好,在公认的大误差范围内。未来的天气调查,如泛星和LSST将产生丰富的信息,低质量的食系统,并应使之成为可能,与后续观测的依赖增加,以检测许多系统与低质量和亚恒星的同伴。随着大量的对象,这些调查将产生高质量的测光,我们建议,它成为可能,以确定这样的系统,即使稀疏的时间采样和相对较少的个人观察。

英文摘要:

We present observations of a new low-mass double-lined eclipsing binary system discovered using repeat observations of the celestial equator from the Sloan Digital Sky Survey II. Using near-infrared photometry and optical spectroscopy we have measured the properties of this short-period [P=0.407037(14) d] system and its two components. We find the following parameters for the two components: M_1=0.272+/-0.020 M_sun, R_1=0.268+/-0.010 R_sun, M_2=0.240+/-0.022 M_sun, R_2=0.248+/-0.0090 R_sun, T_1=3320+/-130 K, T_2=3300+/-130 K. The masses and radii of the two components of this system agree well with theoretical expectations based on models of low-mass stars, within the admittedly large errors. Future synoptic surveys like Pan-STARRS and LSST will produce a wealth of information about low-mass eclipsing systems and should make it possible, with an increased reliance on follow-up observations, to detect many systems with low-mass and sub-stellar companions. With the large numbers of objects for which these surveys will produce high-quality photometry, we suggest that it becomes possible to identify such systems even with sparse time sampling and a relatively small number of individual observations.

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