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arXiv 2203.00786astro-ph.SRastro-ph.GA
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盖亚EDR3近星表中99颗低质量恒星的VVVX近红外测光

VVVX near-IR photometry for 99 low-mass stars in the Gaia EDR3 Catalog of Nearby Stars

Andrea Mejías, Dante Minniti, Javier Alonso-García, Juan Carlos Beamín, Roberto K. Saito, Enrique Solano

备注：
11 pages, 9 figures
发表信息：
A&A 660, A131 (2022)
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摘要：

红矮星占银河系恒星的75%，可以在样本更完整的太阳附近进行详细研究。我们打算使用VVVX调查，DECaPS，Pan-STARRS和WISE的光学和近红外测光来更好地描述从盖亚附近恒星目录中选择的红矮星候选者。我们在VVVX调查和盖亚EDR 3附近恒星子目录中的M矮星的颜色选择样本的位置之间进行了交叉匹配。我们利用VOSA探测了它们的恒星参数和光谱类型。还使用Stefan-Boltzmann方程获得半径。使用演化轨迹和等时线计算了一些天体的质量和年龄。用MKs - M* 关系获得了额外的质量估计。然后，我们验证了我们的两个对象的恒星参数与光谱的TripleSpec仪器在SOAR望远镜，以及我们的恒星总量通过直接比较与一个独立的样本从文献中。我们修改了样本中的对象，并将它们的自行向量与30”以内的其他源进行比较，以识别可能的同伴，并探测它们的RUWE值，以识别未解决的同伴。我们提出了一个目录的物理参数为99个低质量物体的距离从43.2到111.3 pc。Teff的范围从2500到3400 K，样本中的大多数恒星都是M4矮星。我们得到了一个很好的协议与VOSA计算的恒星参数和观测光谱的估计，也与一个独立的样本从文献中比较。VOSA得到的质量分布集中在非常低的质量区域。8个天体的RUWE值>= 1.4，7个符合双星系统的一部分。

英文摘要：

Red dwarf stars, which represent 75% of stars in the Milky Way, can be studied in great detail in the solar neighborhood where the sample is more complete. We intend to better characterize red dwarf candidates selected from the Gaia Catalog of Nearby Stars using optical and near-infrared photometry from the VVVX Survey, DECaPS, Pan-STARRS, and WISE. We performed a cross-matching procedure among the positions of a color-selected sample of M dwarfs in the VVVX Survey and the Gaia EDR3 sub-catalog of nearby stars. We explored their stellar parameters and spectral types using VOSA. Radii were also obtained using the Stefan-Boltzmann equation. Masses and ages were computed for some of the objects using evolutionary tracks and isochrones. Additional mass estimations were obtained with the MKs - M* relation. We then validated our results for the stellar parameters of two of our objects with spectra obtained with the TripleSpec instrument at the SOAR telescope, as well as those of our total amount of stars through a direct comparison with an independent sample from the literature. We revised the objects in our sample and compared their proper motion vectors with other sources within 30" to identify possible companions and probed their RUWE values to identify unresolved companions. We present a catalog of physical parameters for 99 low-mass objects with distances from 43.2 to 111.3 pc. Teffs range from 2500 to 3400 K, with the majority of stars in the sample compatible with being M4 dwarfs. We obtained a good agreement between the stellar parameters computed with VOSA and the estimations from observed spectra, also when comparing with an independent sample from the literature. The distribution of masses obtained with VOSA is concentrated toward the very low-mass regime. Eight objects present values of RUWE >= 1.4 and seven are consistent with being part of a binary system.

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