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arXiv 2009.14784astro-ph.SR
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在NGC 2403的字段中共生候选物2 MASS J07363415 +6538548的性质

The nature of the symbiotic candidate 2MASS J07363415+6538548 in the field of NGC 2403

Jaroslav Merc, Rudolf Gális, Jan Kára, Marek Wolf, Martin Vrašťák

摘要:

新的共生变量在线数据库包括几个特征不佳的物体和候选共生星,不仅在银河系,而且在其他星系。本文研究的目的是揭示2 MASS J 07363415 +6538548的性质,该天体是在NGC 2403领域发现的X射线源,并暂时被归类为共生候选者或灾难性变量。通过分析地面测量的可用光度数据,以及TESS的高精度光度测量,盖亚卫星的显着天体测量,以及从X射线到红外线的其他测量的观测结果,我们发现该物体不是共生星,也不是灾变变星,而是一个活跃的K型矮星。这颗恒星的距离为415 pc,有效温度为4 275 K,光度为0.14 L $\odot$,质量为0.7 M $\odot$,半径为0.7 R $\odot$。它的自转周期约为3天,是一个强X射线源,其X射线光度为~ $10^{30}$ erg/s。陀螺年代学和等时线拟合证实该恒星是年轻的。

英文摘要:

New Online Database of Symbiotic Variables includes several poorly characterised objects and candidate symbiotic stars, not only in the Milky Way but also in other galaxies. The goal of the research presented in this paper was to reveal the nature of 2MASS J07363415+6538548, the object discovered as an X-ray source in the field of NGC 2403, and tentatively classified as a symbiotic candidate or a cataclysmic variable. By analysis of available photometric data from ground-based surveys, together with high precision photometry from TESS, remarkable astrometric measurements of the Gaia satellite, and observations of other surveys spanning from X-rays to infrared, we have found that the object is not a symbiotic star nor a cataclysmic variable but rather an active K-type dwarf. The star is located in the distance of 415 pc, has an effective temperature of 4 275 K, luminosity of 0.14 L$\odot$, a mass of 0.7 M$\odot$, and radius of 0.7 R$\odot$. It has a rotational period ~ 3 days and is a strong X-ray source with the X-ray luminosity of ~ $10^{30}$ erg/s. Gyrochronology and isochrone fitting confirmed that the star is young.

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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