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arXiv 2409.03205astro-ph.SR
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YMDB星表:用于高精度绝对恒星参数测定的年轻大质量分离双星

The YMDB catalog: Young massive detached binaries for the determination of high-precision absolute stellar parameters

Pablo Martín-Ravelo, Roberto Gamen, Julia I. Arias, André-Nicolas Chené, Rodolfo H. Barbá

AI总结:

本文构建了YMDB星表,通过分析87颗O9-B1型年轻大质量分离食双星的TESS光变曲线并结合光谱分类,提供了高精度绝对恒星参数测定所需的高质量光变曲线和可靠分类资源。

摘要:

大质量恒星在星系的宇宙动力学和化学演化中发挥着至关重要的作用,然而我们对它们的演化和性质的理解仍然有限。准确测定恒星参数对于推进我们的认识至关重要。分离食双星(DEBs)由于其两子星之间的相互作用极小,能够实现精确测量,因此在这些参数测定中尤其有价值。本研究介绍了年轻大质量分离双星(YMDB)星表,旨在填补年轻大质量恒星高精度绝对参数测定方面的空白。通过聚焦于光谱型在O9-B1范围内的分离食双星,该星表力求为未来研究提供一个可靠的数据库,并增进我们对大质量恒星演化的理解。我们利用经过自定义流水线处理的TESS光变曲线(LCs),对87颗处于分离食双星中的年轻大质量恒星进行了测光分析。该分析包括确定星等变化幅度、轨道周期、极小时刻、偏心率,以及拱线运动和心跳现象的存在性。我们进行了全面的文献调研以获取MK光谱分类。我们还对19个系统进行了自己的光谱分类,以支持那些缺乏新分类或分类不明确的样本。分析识别出20个此前未报道的双星系统,其中13个新认定为变星。在所研究的87颗恒星中,30颗被确认为YMDB成员,25颗为待光谱分类确认的候选体。其余32颗恒星属于不适宜的光谱型或非分离双星性质。值得注意的发现包括新的光变曲线分类、13个系统中的偏心率,以及若干目标中的心跳现象。YMDB星表提供了高质量光变曲线和可靠恒星分类的资源。

英文摘要:

Massive stars play a crucial role in the cosmic dynamics and chemical evolution of galaxies, however our understanding of their evolution and properties remains limited. An accurate determination of stellar parameters is essential for advancing our knowledge. Detached eclipsing binaries (DEBs) are particularly valuable for these determinations due to the minimal interaction between their stellar components, allowing for precise measurements. This study introduces the Young Massive Detached Binary (YMDB) catalog, designed to address the gap in the high-precision absolute parameter determination for young massive stars. By focusing on DEBs within the spectral range O9-B1, this catalog seeks to provide a reliable database for future studies and improve our understanding of massive star evolution. We conducted a photometric analysis of 87 young massive stars in DEBs using TESS light curves (LCs) that were processed through a custom pipeline. This analysis involved determining the amplitude of magnitude variations, orbital periods, times of minima, eccentricities, and the presence of apsidal motion and heartbeat phenomena. A thorough literature review was performed to obtain MK spectral classifications. We performed our own spectral classification of 19 systems to support the sample where a new classification was lacking or inconclusive. The analysis identified 20 previously unreported binary systems, with 13 newly recognized as variables. Among the 87 stars examined, 30 are confirmed as YMDB members, and 25 are candidates pending spectral classification. The remaining 32 stars belong to unsuitable spectral types or nondetached binary nature. Notable findings include the identification of new LC classifications, eccentricities in 13 systems, and heartbeat phenomena in several targets. The YMDB catalog offers a resource of high-quality LCs and reliable stellar classifications.

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