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Long term CCD photometry of the distant cluster NGC2419: The CMD revisited

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dc.contributor.author Arellano Ferro, A
dc.contributor.author Muneer, S
dc.contributor.author Giridhar, S
dc.contributor.author Bustos Fierro, I
dc.contributor.author Yepez, M. A
dc.contributor.author Garcia Perez, G. A
dc.contributor.author Rios Segura, G
dc.date.accessioned 2024-11-29T05:10:44Z
dc.date.available 2024-11-29T05:10:44Z
dc.date.issued 2024-10
dc.identifier.citation Revista Mexicana de Astronomía y Astrofísica, Vol. 60,No. 2, pp. 277-292 en_US
dc.identifier.issn 0185-1101
dc.identifier.uri http://hdl.handle.net/2248/8584
dc.description Open Access en_US
dc.description.abstract Employing VI images of NGC 2419 acquired over 17 years, light curves for most of the known variables in the field of the cluster are produced. A cluster membership analysis for about 3100 stars in the cluster field with proper motions from Gaia-DR3 revealed the presence of member stars as far as 140 pc from the cluster center and enabled the construction of a cleaner CMD free of field stars. It was found that RRab and RRc stars share the inter-order region in the instability strip, which is unusual for OoII clusters. Theoretical considerations confirm that Pop II cepheids are descendants of extreme ZAHB blue tail stars with very thin envelopes of about 10% of the total mass. Member RR Lyrae stars were employed to calculate independent estimates of the mean cluster metallicity and distance; we found [Fe/H]UV = −1.90 ± 0.27 and D = 86.3 ± 5.0 kpc from the RRab and [Fe/H]UV = −1.88 ± 0.30 and D = 83.1 ± 8.1 kpc from the RRc light curves. en_US
dc.language.iso en en_US
dc.publisher Instituto de Astronomıa, Universidad Nacional Autonoma de Mexico en_US
dc.relation.uri https://doi.org/10.22201/ia.01851101p.2024.60.02.06
dc.rights © 2024: Instituto de Astronom´ıa, Universidad Nacional Aut´onoma de M´exico
dc.subject Globular clusters: general en_US
dc.subject Globular clusters: individual: NGC 2419 en_US
dc.subject Stars: distances en_US
dc.subject Stars: fundamental parameters en_US
dc.subject Stars: horizontal branch en_US
dc.subject Stars: variables: RR Lyrae en_US
dc.title Long term CCD photometry of the distant cluster NGC2419: The CMD revisited en_US
dc.type Article en_US


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