JWST Imaging of the Closest Globular Clusters—V. The White Dwarfs Cooling Sequence of M4

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

Astronomische Nachrichten Pub Date : 2025-01-28 DOI:10.1002/asna.20240125

Luigi R. Bedin, Mattia Libralato, Maurizio Salaris, Domenico Nardiello, Michele Scalco, Massimo Griggio, Jay Anderson, Pierre Bergeron, Andrea Bellini, Roman Gerasimov, Adam J. Burgasser, Daniel Apai

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Abstract

We combine infrared (IR) observations collected by the James Webb Space Telescope with optical deep images by the Hubble Space Telescope taken ~20 years earlier to compute proper-motion membership for the globular cluster (GC) M4 (NGC 6121) along its entire white dwarf (WD) cooling sequence (CS). These new IR observations allow us, for only the second time in a GC, to compare WD models with observations over a wide range of wavelengths, constraining fundamental astrophysical properties of WDs. Furthermore, we investigate the presence of WDs with IR excess along the WD CS of M4, similar to the recent study conducted on the GC NGC 6397. We also determine the age difference between M4 and NGC 6397 by comparing the absolute F150W2 magnitudes of the luminosity function peak at the bottom of the observed WD CS and find that M4 is slightly younger, by 0.8 ± 0.5 Gyr.

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最近球状星团的JWST成像- v。M4的白矮星冷却序列

我们将詹姆斯韦伯太空望远镜收集的红外（IR）观测数据与哈勃太空望远镜拍摄的约20年前的光学深度图像相结合，计算了球状星团（GC） M4 （NGC 6121）沿其整个白矮星（WD）冷却序列（CS）的自运动隶属度。这些新的红外观测使我们能够在GC中第二次将WD模型与广泛波长范围内的观测结果进行比较，从而限制了WD的基本天体物理特性。此外，我们还研究了沿M4的WD CS存在IR过量的WDs，类似于最近对GC NGC 6397的研究。我们还通过比较观测到的WD CS底部亮度函数峰的绝对F150W2等，确定了M4与NGC 6397的年龄差异，发现M4略年轻，相差0.8±0.5 Gyr。

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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.