Friedrich Anders, Chloé Padois, Marc Vilanova Sar, Marcin Semczuk, Marc del Alcázar-Julià, Francesca Figueras
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引用次数: 0
摘要
已知基模经典造父变星在银河系中的分布（数据来自Pietrukowicz et al. 2021）。上图：以银河系为中心的笛卡尔坐标的位置，按年龄用颜色编码；下图：年龄与星系中心距离，由金属丰度（用于光谱[Fe/H]测量的物体）进行颜色编码。造父变星的年龄分布在银河系天体物理学中是一个特别有趣和令人困惑的观测结果。在银河系内部发现最年轻的造父变星似乎与被广泛接受的由内而外形成的理论相冲突，在过去的10亿年里，恒星的形成逐渐到达银河系的外部区域。F. Anders等人在本期（e70009）发表的论文为这个难题提供了解决方案。
Distribution of known fundamental-mode classical Cepheids in the Milky Way (data from Pietrukowicz et al. 2021). Top: positions in Galactocentric Cartesian coordinates, colour-coded by age; bottom: Age versus Galactocentric distance, colour-coded by metallicity (for objects with spectroscopic [Fe/H] measurements). The age distribution of Milky Way Cepheids is a particularly interesting and puzzling observable in the Galactic astrophysics context. Finding the youngest Cepheids in the inner Galaxy seems to be in conflict with the widely accepted inside-out formation scenario where by star formation progressively reached the outer regions of the Galaxy over the past billion years. A solution of this puzzle is offered in the paper by F. Anders et al. published in this issue (e70009).
期刊介绍：
Astronomische Nachrichten, founded in 1821 by H. C. Schumacher, is the oldest astronomical journal worldwide still being published. Famous astronomical discoveries and important papers on astronomy and astrophysics published in more than 300 volumes of the journal give an outstanding representation of the progress of astronomical research over the last 180 years. Today, Astronomical Notes/ Astronomische Nachrichten publishes articles in the field of observational and theoretical astrophysics and related topics in solar-system and solar physics. Additional, papers on astronomical instrumentation ground-based and space-based as well as papers about numerical astrophysical techniques and supercomputer modelling are covered. Papers can be completed by short video sequences in the electronic version. Astronomical Notes/ Astronomische Nachrichten also publishes special issues of meeting proceedings.
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