Eclipsing binary stars in the Large Magellanic Cloud. Results from the EROS-2, OGLE and VMC surveys ⋆
Eclipsing binary stars in the Large Magellanic Cloud. Results from the EROS-2, OGLE and VMC surveys ⋆
复制标题
DOI：
10.1093/mnras/stu1151
复制
发表时间：
2014-06
影响因子：
4.8
通讯作者：
T. Muraveva;G. Clementini;C. Maceroni;C. Evans;M. Moretti;M. Moretti;M. Cioni;J. Marquette;V. Ripepi;R. Grijs;M. Groenewegen;A. Piatti;J. V. Loon
中科院分区：
文献类型：
--
作者：
T. Muraveva;G. Clementini;C. Maceroni;C. Evans;M. Moretti;M. Moretti;M. Cioni;J. Marquette;V. Ripepi;R. Grijs;M. Groenewegen;A. Piatti;J. V. Loon
本文介绍了第二代EROS巡天在大麦哲伦星云（LMC）中发现的1768颗食双星（EBs）的星表，其中493颗是在大麦哲伦星云外围（中央条外）新发现的。这些来源最初被包括在从EROS-2星表中提取的候选经典造父变星（CC）列表中，该列表基于周期（0.89 < PEROS <15.85天）与光度（13.39 < hBEROSi < 17.82等）图。在光变曲线的视觉检查之后，我们将它们重新归类为食双星。它们有蓝色（BEROS −REROS < 0.2等），因此我们将它们归类为含有热质量成分的热食双星（HEB）：主序星（MS）或蓝巨星。我们目前的KS波段光变曲线999二进制从我们的样本，有一个对应的VISTA近红外ESO公众调查的麦哲伦云系统（VMC）。我们提供了13个HEB与现有的光谱学的光谱分类。我们把我们的样品分为接触式双星和分离/半分离系统的基础上，视觉检查和光变曲线的傅立叶分解的参数和分析的周期光度（PL）的关系的接触式系统使用的REROS和Ks的幅度在最大光。在我们的例子中，类接触二进制不遵循PL关系。我们分析了OGLE III目录中的接触双星样本，并证实PLI和PLK序列仅由包含红巨星成分的食双星定义。
We present a catalogue of 1768 eclipsing binary stars (EBs) detected in the Large Magellanic Cloud (LMC) by the second generation of the EROS survey (hereinafter EROS-2); 493 of them are new discoveries located in outer regions (out of the central bar) of the LMC. These sources were originally included in a list of candidate classical Cepheids (CCs) extracted from the EROS-2 catalogue on the basis of the period (0.89 < PEROS <15.85 days) versus luminosity (13.39 < hBEROSi < 17.82 mag) diagram. After visual inspection of the light curves we reclassified them as eclipsing binaries. They have blue colours (BEROS −REROS < 0.2 mag) hence we classed them as hot eclipsing binaries (HEBs) containing hot massive components: main sequence (MS) stars or blue giants. We present Ks-band light curves for 999 binaries from our sample that have a counterpart in the VISTA near-infrared ESO public survey of the Magellanic Clouds system (VMC). We provide spectral classifications of 13 HEBs with existing spectroscopy. We divided our sample into contact-like binaries and detached/semi-detached systems based on both visual inspection and the parameters of the Fourier decomposition of the light curves and analysed the period-luminosity (PL) relations of the contact-like systems using the REROS and Ks magnitudes at maximum light. The contact-like binaries in our sample do not follow PL relations. We analysed the sample of contact binaries from the OGLE III catalogue and confirmed that PLI and PLKs sequences are defined only by eclipsing binaries containing a red giant component.