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Bedin, LR, Libralato, M, Salaris, M, Nardiello, D, Scalco, M, Griggio, M, Anderson, J, Bergeron, P, Bellini, A, Gerasimov, R, Burgasser, AJ and Apai, D (2025) JWST Imaging of the Closest Globular Clusters—V. The White Dwarfs Cooling Sequence of M4. Astronomical Notes, 346 (2). ISSN 0004-6337
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JWST Imaging of the Closest Globular Clusters—V. The White Dwarfs Cooling Sequence of M4.pdf - Published Version Available under License Creative Commons Attribution. Download (5MB) | Preview |
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.
| Item Type: | Article |
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| Uncontrolled Keywords: | 5101 Astronomical Sciences; 51 Physical Sciences; 0201 Astronomical and Space Sciences; Astronomy & Astrophysics; 5101 Astronomical sciences; 5109 Space sciences |
| Subjects: | Q Science > QB Astronomy Q Science > QC Physics |
| Divisions: | Astrophysics Research Institute |
| Publisher: | Wiley |
| SWORD Depositor: | A Symplectic |
| Date Deposited: | 25 Apr 2025 15:06 |
| Last Modified: | 25 Apr 2025 15:15 |
| DOI or ID number: | 10.1002/asna.20240125 |
| URI: | https://researchonline.ljmu.ac.uk/id/eprint/26266 |
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