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arXiv 1412.2736astro-ph.SR
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含OSIRIS/GTC的超冷矮星的低分辨光谱

Low-resolution optical spectra of ultracool dwarfs with OSIRIS/GTC

Yanina Metodieva, Antoaneta Antonova, Valeri Golev, Dinko Dimitrov, David García-Álvarez, John Gerard Doyle

摘要:

我们提出的低分辨率光谱与OSIRIS/GTC(光学系统成像和低分辨率集成光谱/大加那利望远镜)的超冷矮星的样品的结果。对于七个物体的子样本,基于2 MASS近红外光度颜色,确定“光度”光谱类型,并将其与光谱学的结果进行比较。对发射H $α$谱线的恒星,测量了谱线的等效宽度,并计算了H $α$谱线与辐射光度的比值。我们发现,两个矮星表现出长期存在的磁活动,LP 326-21 --类准常数,和2 MASS J17071830+6439331 --变量。

英文摘要:

We present the results of low-resolution optical spectroscopy with OSIRIS/GTC (Optical System for Imaging and Low Resolution Integrated Spectroscopy / Gran Telescopio Canarias) for a sample of ultracool dwarfs. For a subsample of seven objects, based on 2MASS NIR photometric colours, a 'photometric' spectral type is determined and compared to the results of the optical spectroscopy. For the stars, showing H$α$ line in emission, equivalent widths were measured, and the ratio of H$α$ to bolometric luminosity were calculated. We find that two dwarfs show the presence of magnetic activity over long periods, LP 326-21 -- quasi-constant-like, and 2MASS J17071830+6439331 -- variable.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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