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Photometry and astrometry with JWST - III. A NIRCam-Gaia DR3 analysis of the open cluster NGC 2506

Nardiello, D, Bedin, LR, Griggio, M, Salaris, M, Scalco, M and Cassisi, S (2023) Photometry and astrometry with JWST - III. A NIRCam-Gaia DR3 analysis of the open cluster NGC 2506. Monthly Notices of the Royal Astronomical Society, 525 (2). pp. 2585-2604. ISSN 0035-8711

Photometry and astrometry with JWST III A NIRCamGaia DR3 analysis of the open cluster NGC 2506.pdf - Published Version

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In the third paper of this series aimed at developing the tools for analysing resolved stellar populations using the cameras on board of the James Webb Space Telescope (JWST), we present a detailed multiband study of the 2 Gyr Galactic open cluster NGC 2506. We employ public calibration data sets collected in multiple filters to: (i) derive improved effective Point Spread Functions (ePSFs) for 10 NIRCam filters; (ii) extract high-precision photometry and astrometry for stars in the cluster, approaching the main sequence (MS) lower mass of ∼0.1 M·; and (iii) take advantage of the synergy between JWST and Gaia DR3 to perform a comprehensive analysis of the cluster's global and local properties. We derived a MS binary fraction of ∼57.5 per cent, extending the Gaia limit (∼0.8 M·) to lower masses (∼0.4 M·) with JWST. We conducted a study on the mass functions (MFs) of NGC 2506, mapping the mass segregation with Gaia data, and extending MFs to lower masses with the JWST field. We also combined information on the derived MFs to infer an estimate of the cluster present-day total mass. Lastly, we investigated the presence of white dwarfs (WDs) and identified a strong candidate. However, to firmly establish its cluster membership, as well as that of four other WD candidates and of the majority of faint low-mass MS stars, further JWST equally deep observations will be required. We make publicly available catalogues, atlases, and the improved ePSFs.

Item Type: Article
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: 0201 Astronomical and Space Sciences; Astronomy & Astrophysics
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press (OUP)
SWORD Depositor: A Symplectic
Date Deposited: 02 Oct 2023 12:35
Last Modified: 02 Oct 2023 12:45
DOI or ID number: 10.1093/mnras/stad2445
URI: https://researchonline.ljmu.ac.uk/id/eprint/21670
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