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Griggio, M, Salaris, M, Nardiello, D, Bedin, LR, Cassisi, S and Anderson, J (2023) Exploring the origin of the extended main-sequence turn off in M37 through the white dwarf cooling sequence. Monthly Notices of the Royal Astronomical Society, 524 (1). pp. 108-117. ISSN 0035-8711
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Exploring the origin of the extended main-sequence turn-off in M37 through the white dwarf cooling sequence.pdf - Published Version Download (1MB) | Preview |
Abstract
We use new observations from the Canada-France-Hawaii Telescope to study the white dwarf cooling sequence of the open cluster M37, a cluster that displays an extended main sequence turn-off and, according to a recent photometric analysis, also a spread of initial chemical composition. By taking advantage of a first epoch collected in 1999 with the same telescope, we have been able to calculate proper motions for sources as faint as g ∼ 26 (about ∼ 6 magnitudes fainter than the Gaia limit), allowing us to separate cluster members from field stars. This has enabled us to isolate a sample of the white dwarf population of M37, reaching the end of the cooling sequence (at g ∼ 23.5). The here-derived atlas and calibrated catalogue of the sources in the field of view is publicly released as supplementary on-line material. Finally, we present an exhaustive comparison of the white dwarf luminosity function with theoretical models, which has allowed us to exclude the age-spread scenario as the main responsible for the extended turnoff seen in the cluster colour-magnitude-diagram.
| Item Type: | Article |
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| Additional Information: | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2023 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
| Uncontrolled Keywords: | astro-ph.SR; astro-ph.SR; astro-ph.GA |
| Subjects: | Q Science > QB Astronomy Q Science > QC Physics |
| Divisions: | Astrophysics Research Institute |
| Publisher: | Oxford University Press |
| Related URLs: | |
| SWORD Depositor: | A Symplectic |
| Date Deposited: | 26 Jun 2023 11:42 |
| Last Modified: | 10 Jul 2023 09:30 |
| DOI or ID number: | 10.1093/mnras/stad1843 |
| URI: | https://researchonline.ljmu.ac.uk/id/eprint/20065 |
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