Cover Picture: Astron. Nachr. 1/2025

IF 1 4区物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS Astronomische Nachrichten Pub Date : 2025-02-02 DOI:10.1002/asna.20259010

S. Friedrich, C. Maitra, K. Dennerl, A. Schwope, K. Werner, B. Stelzer

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Abstract

Hunting for white dwarfs in eROSITA surveys 1-4 with special processing. The Gaia color-magnitude diagram shows all white dwarf candidates from the Gaia white dwarf catalogue (Gentile Fusillo et al. 2021), colour-coded with the probability of being a white dwarf. Black circles mark sources in the ROSAT white dwarf catalogue (Fleming et al. 1996) that match entries in the Gaia white dwarf catalogue (light blue crosses indicate those in the German half of the eROSITA sky). Orange crosses mark eROSITA sources with a hardness ratio of ≤ −0.94 and with counterparts in the Gaia white dwarf catalogue. Those highlighted with a dark green circle have a probability larger than 90 % of being a white dwarf in that catalogue. The cooling tracks of white dwarfs with masses between 0.4 and 1.2 solar masses are shown as gray lines in steps of 0.1 solar masses (top to bottom). For more details see the related paper by S. Friedrich et al. published in this issue e240139.

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封面图片：Astron。乙酰。1/2025

在eROSITA调查1-4中寻找白矮星，并进行特殊处理。盖亚彩色星等图显示了盖亚白矮星目录（Gentile Fusillo et al. 2021）中所有候选白矮星的颜色，以成为白矮星的概率进行了颜色编码。黑色圆圈表示ROSAT白矮星目录（Fleming et al. 1996）中与盖亚白矮星目录中的条目相匹配的来源（浅蓝色十字表示在ROSAT白矮星天空的德国部分）。橙色叉标记了硬度比≤- 0.94的eROSITA源与盖亚白矮星目录中的对应源。那些用深绿色圆圈突出显示的恒星在该星表中成为白矮星的概率大于90%。质量在0.4到1.2太阳质量之间的白矮星的冷却轨迹以灰色线条表示，以0.1太阳质量为阶梯（从上到下）。更多详细信息请参见S. Friedrich et al.在本期e240139上发表的相关论文。

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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.

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