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Verfasst von:Lim, Dongwook [VerfasserIn]   i
 Chun, Sang-Hyun [VerfasserIn]   i
 Lee, Young-Wook [VerfasserIn]   i
 Chung, Chul [VerfasserIn]   i
 Koch-Hansen, Andreas [VerfasserIn]   i
 Hong, Seungsoo [VerfasserIn]   i
Titel:Two stellar populations with different metallicities in the low-mass globular cluster Gran 5
Verf.angabe:Dongwook Lim, Sang-Hyun Chun, Young-Wook Lee, Chul Chung, Andreas J. Koch-Hansen, Seungsoo Hong
E-Jahr:2024
Jahr:December 2024
Umfang:12 S.
Illustrationen:Illustrationen
Fussnoten:Veröffentlicht: 27. November 2024 ; Gesehen am 02.06.2025
Titel Quelle:Enthalten in: Astronomy and astrophysics
Ort Quelle:Les Ulis : EDP Sciences, 1969
Jahr Quelle:2024
Band/Heft Quelle:692(2024) vom: Dez., Artikel-ID A14, Seite 1-12
ISSN Quelle:1432-0746
Abstract:Context. With the increasing number of discoveries of globular clusters in the inner Milky Way, the need for spectroscopic confirmation and further investigation of their stellar populations and chemodynamical properties has become crucial. Aims. Gran 5 is a newly reported low-mass globular cluster located close to the Galactic center, and it is thought to be an accreted object associated with the Gaia-Enceladus structure. This study aims to investigate the stellar populations of Gran 5 and their detailed chemical properties. Methods. We performed high-resolution near-infrared spectroscopy on seven stars in the field of Gran 5 using IGRINS on the Gemini-South telescope. Results. We identified six stars as cluster members and reveal that they are divided into two stellar populations with different metallicities, with mean [Fe/H] values of −0.76 dex and −0.55 dex, respectively. In addition, the chemodynamical properties of Gran 5 agree with those of in situ globular clusters. Conclusions. Our findings represent the first detection of two stellar populations with different metallicities in a low-mass globular cluster. This suggests that the metallicity variation in Gran 5 may have arisen from processes different from those in other globular clusters with metallicity variation, or that it may have lost a substantial amount of its initial mass during its evolution.
DOI:doi:10.1051/0004-6361/202451876
URL:Bitte beachten Sie: Dies ist ein Bibliographieeintrag. Ein Volltextzugriff für Mitglieder der Universität besteht hier nur, falls für die entsprechende Zeitschrift/den entsprechenden Sammelband ein Abonnement besteht oder es sich um einen OpenAccess-Titel handelt.

kostenfrei: Volltext: https://doi.org/10.1051/0004-6361/202451876
 kostenfrei: Volltext: https://www.aanda.org/articles/aa/abs/2024/12/aa51876-24/aa51876-24.html
 DOI: https://doi.org/10.1051/0004-6361/202451876
Datenträger:Online-Ressource
Sprache:eng
K10plus-PPN:1927253071
Verknüpfungen:→ Zeitschrift

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