H-band discovery of additional second-generation stars in the Galactic bulge globular cluster NGC 6522 as observed by APOGEE and Gaia
- Creators
- Fernández-Trincado, J.
- Zamora, O.
- Souto, Diogo
- Cohen, R.
- Dell'agli, F.
- García-Hernández, D.
- Masseron, T.
- Schiavon, R.
- Mészáros, Sz.
- Cunha, K.
- Hasselquist, S.
- Shetrone, M.
- Schiappacasse Ulloa, J.
- Tang, B.
- Geisler, D.
- Schleicher, D.
- Villanova, S.
- Mennickent, R.
- Minniti, D.
- Alonso-García, J.
- Manchado, A.
- Beers, T.
- Sobeck, J.
- Zasowski, G.
- Schultheis, M.
- Majewski, S.
- Rojas-Arriagada, A.
- Almeida, A.
- Santana, F.
- Oelkers, R.
- Longa-Peña, P.
- Carrera, R.
- Burgasser, A.
- Lane, R.
- Roman-Lopes, A.
- Ivans, I.
- Hearty, F.
- Others:
- Univers, Transport, Interfaces, Nanostructures, Atmosphère et environnement, Molécules (UMR 6213) (UTINAM) ; Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Franche-Comté (UFC) ; Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC)
- Instituto de Astronomia y ciencias Planetarias de Atacama (INCT) ; Universidad de Atacama
- Universidad de Concepción [Chile]
- Instituto de Astrofisica de Canarias (IAC)
- Universidad de La Laguna [Tenerife - SP] (ULL)
- Universidad Andrés Bello [Santiago] (UNAB)
- Vatican Observatory ; Vatican Observatory
- Instituto de Astrofísica de Canarias and Consejo Superior de Investigaciones Científicas ; Instituto de Astrofísica de Canarias and Consejo Superior de Investigaciones Científicas
- Center for the Study of Cosmic Evolution (CSCE) ; Michigan State University [East Lansing] ; Michigan State University System-Michigan State University System
- University of Notre Dame [Indiana] (UND)
- Joseph Louis LAGRANGE (LAGRANGE) ; Université Nice Sophia Antipolis (1965 - 2019) (UNS) ; COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur ; COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS)
- Pontificia Universidad Católica de Chile (UC)
- Facultad de Ciencias, Universidad de La Serena ; Universidad de La Serena (USERENA)
Description
We present an elemental abundance analysis of high-resolution spectra for five giant stars spatially located within the innermost regions of the bulge globular cluster NGC 6522 and derive Fe, Mg, Al, C, N, O, Si, and Ce abundances based on H-band spectra taken with the multi-object APOGEE-north spectrograph from the SDSS-IV Apache Point Observatory Galactic Evolution Experiment (APOGEE) survey. Of the five cluster candidates, two previously unremarked stars are confirmed to have second-generation (SG) abundance patterns, with the basic pattern of depletion in C and Mg simultaneous with enrichment in N and Al as seen in other SG globular cluster populations at similar metallicity. In agreement with the most recent optical studies, the NGC 6522 stars analyzed exhibit (when available) only mild overabundances of the s-process element Ce, contradicting the idea that NGC 6522 stars are formed from gas enriched by spinstars and indicating that other stellar sources such as massive AGB stars could be the primary polluters of intra-cluster medium. The peculiar abundance signatures of SG stars have been observed in our data, confirming the presence of multiple generations of stars in NGC 6522.
Abstract
International audience
Additional details
- URL
- https://hal.archives-ouvertes.fr/hal-02468405
- URN
- urn:oai:HAL:hal-02468405v1
- Origin repository
- UNICA