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arXiv 1901.09302astro-ph.GA
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APOGEE和GALAH中的疏散星团:结合盖亚和地面光谱观测

Open clusters in APOGEE and GALAH: Combining Gaia and ground-based spectroscopic surveys

R. Carrera, A. Bragaglia, T. Cantat-Gaudin, A. Vallenari, L. Balaguer-Núñez, D. Bossini, L. Casamiquela, C. Jordi, R. Sordo, C. Soubiran

摘要:

内容:疏散星团是研究各种天体物理学课题的理想实验室,从银河系盘的性质到恒星演化模型。因此,了解它们的金属丰度和可能的详细化学丰度非常重要。然而,具有由高分辨率光谱学确定的化学丰度的系统的数量仍然很少。目的:为了增加具有径向速度和化学丰度的疏散星团的数量,我们使用了公开可用的巡天目录和盖亚数据。研究方法:疏散星团恒星是在APOGEE和GALAH光谱巡天中通过交叉匹配它们最新发布的数据与根据盖亚第二次发布的数据在许多星团中推导出高概率天体测量成员的恒星来识别的。结果:分别从APOGEE和GALAH数据中确定了131个和14个星系团的径向速度。这是第一次用高分辨率谱对16个星系的径向速度进行测定。铁丰度已获得90和14个系统从APOGEE和GALAH样品,分别。据我们所知,其中66个星团(57个在APOGEE,9个在GALAH)在文献中没有先前的测定。对于90和7集群中的APOGEE和GALAH样品,分别,我们还确定了平均丰度为Na,Mg,Al,Si,Ca,Cr,Mn和Ni。

英文摘要:

Context: Open clusters are ideal laboratories to investigate a variety of astrophysical topics, from the properties of the Galactic disk to stellar evolutionary models. Knowing their metallicity and possibly detailed chemical abundances is therefore important. However, the number of systems with chemical abundances determined from high resolution spectroscopy is still small.\\ Aims: To increase the number of open clusters with radial velocities and chemical abundances determined from high resolution spectroscopy we used publicly available catalogues of surveys in combination with Gaia data.\\ Methods: Open cluster stars have been identified in the APOGEE and GALAH spectroscopic surveys by cross-matching their latest data releases with stars for which high-probability astrometric membership has been derived in many clusters on the basis of the Gaia second data release.\\ Results: Radial velocities have been determined for 131 and 14 clusters from APOGEE and GALAH data, respectively. This is the first radial velocity determination from high resolution spectra for 16 systems. Iron abundances have been obtained for 90 and 14 systems from APOGEE and GALAH samples, respectively. To our knowledge 66 of these clusters (57 in APOGEE and 9 in GALAH) do not have previous determinations in the literature. For 90 and 7 clusters in the APOGEE and GALAH samples, respectively, we have also determined average abundances for Na, Mg, Al, Si, Ca, Cr, Mn, and Ni.

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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