Gaia 数据发布 2：观测赫罗图
太阳与恒星天体物理
2018-08-15 v2 星系天体物理
摘要
我们强调了 Gaia DR2 在研究赫罗图 (HRD) 许多精细结构方面的能力。Gaia 使我们能够呈现许多不同的 HRD，尤其取决于恒星族的选择。我们在此不追求恒星类型或恒星演化方面的完备性，而是选择了若干说明性示例。我们描述了在 Gaia DR2 中可做的某些选择以突出 Gaia HRD 的主要结构。我们选取了场星与星团（疏散星团和球状星团）恒星，将观测与先前的分类及恒星演化轨迹进行比较，并呈现 Gaia HRD 随年龄、金属丰度和运动学的变化。还分析了恒星演化的晚期阶段，如热亚矮星、后 AGB 星、行星状星云和白矮星，以及低质量棕矮星天体。Gaia HRD 在精度和银河系各恒星族及恒星演化阶段的覆盖面上均是前所未有的。呈现了 HRD 的许多精细结构。白矮星序列分裂为氢白矮星和氦白矮星的现象首次在 HRD 中得到呈现。运动学与 HRD 之间的关系得到了很好的说明。在一个经典的晕运动学选择中，两类不同的族群在 HRD 中被明确识别。提供了选定疏散星团列表的成员关系和平均参数。它们使得能够绘制非常详细的星团序列，突出精细结构，并提供极其精确的经验等时线，这将有助于深入理解恒星物理。Gaia DR2 展示了将精确天体测量与测光相结合用于大样本恒星演化与恒星族研究的潜力，并为基于 HRD 的研究开辟了全新领域。
引用
@article{arxiv.1804.09378,
title = {Gaia Data Release 2: Observational Hertzsprung-Russell diagrams},
author = {Gaia Collaboration and C. Babusiaux and F. van Leeuwen and M. A. Barstow and C. Jordi and A. Vallenari and D. Bossini and A. Bressan and T. Cantat-Gaudin and M. van Leeuwen and A. G. A. Brown and T. Prusti and J. H. J. de Bruijne and C. A. L. Bailer-Jones and M. Biermann and D. W. Evans and L. Eyer and F. Jansen and S. A. Klioner and U. Lammers and L. Lindegren and X. Luri and F. Mignard and C. Panem and D. Pourbaix and S. Randich and P. Sartoretti and H. I. Siddiqui and C. Soubiran and N. A. Walton and F. Arenou and U. Bastian and M. Cropper and R. Drimmel and D. Katz and M. G. Lattanzi and J. Bakker and C. Cacciari and J. Castañeda and L. Chaoul and N. Cheek and F. DeAngeli and C. Fabricius and R. Guerra and B. Holl and E. Masana and R. Messineo and N. Mowlavi and K. Nienartowicz and P. Panuzzo and J. Portell and M. Riello and G. M. Seabroke and P. Tanga and F. Thévenin and G. Gracia-Abril and G. Comoretto and M. Garcia-Reinaldos and D. Teyssier and M. Altmann and R. 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journal= {arXiv preprint arXiv:1804.09378},
year = {2018}
}
备注
Published in the A&A Gaia Data Release 2 special issue. Tables 2 and A.4 corrected. Tables available at http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/616/A10