Cover Picture: Astron. Nachr. 6/2024

IF 1.1 4区物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS

Astronomische Nachrichten Pub Date : 2024-06-17 DOI:10.1002/asna.20249014

Michele Scalco, Roman Gerasimov, Luigi R. Bedin, Enrico Vesperini, Domenico Nardiello, Maurizio Salaris, Adam Burgasser, Jay Anderson, Mattia Libralato, Andrea Bellini, Piero Rosati

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Abstract

Color-magnitude diagram of the lower mass end of the Main Sequence of globular cluster NGC 6752, as derived from NIR images of a deep field observed under a HST Large Programme led by L.R.Bedin. Three main stellar populations can be reliably distinguished within this cluster. The three isochrones (blue, green, and red lines) were computed with different chemical compositions, adjusted to match the observed colors of the different generations of stars at an age of 12.63 Gy. In the lower left part of the plot, the corresponding isochrone for the White Dwarfs (at an age of 12.5 Gy) is shown in purple, together with the three WD candidates shown as orange crosses. For each isochrone, specific mass values are marked by labeled filled dots. A detailed analysis of the HST data and a discussion of possible scenarios for the formation of multiple stellar populations within NGC 6752 is presented in the article by Scalco et al., this issue e240018.

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封面图片：Astron.Nachr.6/2024

球状星团NGC 6752主序低质量端的色星图，由L.R.Bedin领导的HST大型计划观测到的深视场近红外图像得出。在这个星团中可以可靠地区分出三大恒星群。三条等时线（蓝线、绿线和红线）是根据不同的化学成分计算出来的，经过调整后与年龄为 12.63 Gy 时观测到的不同代恒星的颜色相匹配。在图的左下方，白矮星（年龄为 12.5 Gy）的相应等时线以紫色显示，三个候选白矮星则以橙色交叉显示。每个等时线的具体质量值都用标注的填充点标出。对 HST 数据的详细分析，以及对 NGC 6752 内多个恒星群形成的可能情况的讨论，见 Scalco 等人的文章，本期 e240018。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Astronomische Nachrichten 地学天文-天文与天体物理

CiteScore

1.80

自引率

11.10%

发文量

审稿时长

4-8 weeks

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.