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arXiv 2108.07866astro-ph.SR
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前主序星向主序星过渡阶段发射线星的识别

Identification of emission-line stars in transition phase from pre-main sequence to main sequence

Suman Bhattacharyya, Blesson Mathew, Gourav Banerjee, R. Anusha, KT Paul, Sreeja S Kartha

摘要:

前主序星(PMS)经过一段时间演化到主序星(MS)阶段。有趣的是,我们发现现有文献中缺乏研究,这些研究旨在更好地了解PMS到MS过渡阶段的恒星。本研究的目的是检测这种罕见的恒星,我们将其命名为“过渡阶段”(TP)候选者-从PMS阶段发展到MS阶段的恒星。我们确定了98 TP候选人使用光度分析的样本2167经典Be(CBe)和225赫比格Ae/Be(HAeBe)的恒星。这种识别是通过分析近红外和中红外过量以及它们在光学色星等图中的位置来完成的。这些TP候选者中的58个的年龄和质量分别被确定为0.1-5百万年和2-10.5百万$_\odot$。TP候选人被发现拥有旋转速度和颜色过剩值之间的CBe和HAeBe的明星,这是重新确认通过使用机器学习方法生成一组合成样本。

英文摘要:

Pre-main sequence (PMS) stars evolve into main sequence (MS) phase over a period of time. Interestingly, we found a scarcity of studies in existing literature that examines and attempts to better understand the stars in PMS to MS transition phase. The purpose of the present study is to detect such rare stars, which we named as 'Transition Phase' (TP) candidates - stars evolving from the PMS to the MS phase. We identified 98 TP candidates using photometric analysis of a sample of 2167 classical Be (CBe) and 225 Herbig Ae/Be (HAeBe) stars. This identification is done by analyzing the near- and mid-infrared excess and their location in the optical color-magnitude diagram. The age and mass of 58 of these TP candidates are determined to be between 0.1-5 Myr and 2-10.5 M$_\odot$, respectively. The TP candidates are found to possess rotational velocity and color excess values in between CBe and HAeBe stars, which is reconfirmed by generating a set of synthetic samples using the machine learning approach.

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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