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

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

doi:10.1002/asna.20240125

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

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

Research output: Contribution to journal › Article › peer-review

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.

Original language	English (US)
Article number	e20240125
Journal	Astronomische Nachrichten
Volume	346
Issue number	2
DOIs	https://doi.org/10.1002/asna.20240125
State	Published - Feb 2025

Keywords

astrometry
globular cluster (individual): M4 (NGC 6121)
photometry: white dwarfs

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1002/asna.20240125

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@article{a8fd4a0e1e2c43eebf8730d46eaa6c9f,

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

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.",

keywords = "astrometry, globular cluster (individual): M4 (NGC 6121), photometry: white dwarfs",

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

note = "Publisher Copyright: {\textcopyright} 2025 The Author(s). Astronomische Nachrichten published by Wiley-VCH GmbH.",

year = "2025",

month = feb,

doi = "10.1002/asna.20240125",

language = "English (US)",

volume = "346",

journal = "Astronomische Nachrichten",

issn = "0004-6337",

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number = "2",

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TY - JOUR

T1 - JWST Imaging of the Closest Globular Clusters—V. The White Dwarfs Cooling Sequence of M4

AU - Bedin, Luigi R.

AU - Libralato, Mattia

AU - Salaris, Maurizio

AU - Nardiello, Domenico

AU - Scalco, Michele

AU - Griggio, Massimo

AU - Anderson, Jay

AU - Bergeron, Pierre

AU - Bellini, Andrea

AU - Gerasimov, Roman

AU - Burgasser, Adam J.

AU - Apai, Daniel

PY - 2025/2

Y1 - 2025/2

N2 - 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.

AB - 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.

KW - astrometry

KW - globular cluster (individual): M4 (NGC 6121)

KW - photometry: white dwarfs

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U2 - 10.1002/asna.20240125

DO - 10.1002/asna.20240125

M3 - Article

AN - SCOPUS:85216337846

SN - 0004-6337

VL - 346

JO - Astronomische Nachrichten

JF - Astronomische Nachrichten

IS - 2

M1 - e20240125

ER -

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

Abstract

Keywords

ASJC Scopus subject areas

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