论文标题

VVVX附近恒星Gaia EDR3目录中99个低质量星的近IIR光度法

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

论文作者

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

论文摘要

可以在样本更完整的太阳能街区中进行详细研究,以银河系为75%的红矮星。我们打算通过使用VVVX调查,Decaps,Pan-Starrs和Wise从附近恒星的Gaia目录中选出的红色矮人候选者进行更好的表征。我们在VVVX调查中的颜色选择的M矮人样本和附近恒星的Gaia EDR3子录像带中进行了交叉匹配程序。我们使用VOSA探索了他们的出色参数和光谱类型。还使用Stefan-Boltzmann方程获得了半径。使用进化轨道和等环对某些对象计算质量和年龄。通过MK -M*关系获得了其他质量估计。然后,我们通过在Soar望远镜处使用TriplesPec仪器获得的光谱以及通过与文献中的独立样本直接比较的三颗仪器以及我们的总恒星中的光谱以及我们的总恒星中的光谱验证了我们的两个对象的恒星参数。我们修改了样本中的对象,并将其适当的运动向量与30英寸内的其他来源进行了比较,以识别可能的伴侣并探测其ruwe值以识别未解决的伴侣。我们提出了99个低质量物体的物理参数目录,其距离为43.2的距离为43.2到111.3pc。teffsgood compate compatible vefs good compatible compy weffs in 2500至3400 k的范围内,we we we we we we we we we we we we we we we we we we we we we。当与文献中的独立样本进行比较时,用VOSA计算的恒星参数与观察到的光谱进行了比较。

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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