Gemini/Phoenix H -band analysis of the globular cluster AL 3

B. Barbuy, H. Ernandes, S. O. Souza, R. Razera, T. Moura, J. Meléndez, A. Pérez-Villegas, M. Zoccali, D. Minniti, B. Dias, S. Ortolani, E. Bica

Research output: Contribution to journalArticlepeer-review

Abstract

Context. The globular cluster AL 3 is old and located in the inner bulge. Three individual stars were observed with the Phoenix spectrograph at the Gemini South telescope. The wavelength region contains prominent lines of CN, OH, and CO, allowing the derivation of C, N, and O abundances of cool stars. Aims. We aim to derive C, N, O abundances of three stars in the bulge globular cluster AL 3, and additionally in stars of NGC 6558 and HP 1. The spectra of AL 3 allows us to derive the cluster's radial velocity. Methods. For AL 3, we applied a new code to analyse its colour-magnitude diagram. Synthetic spectra were computed and compared to observed spectra for the three clusters. Results. We present a detailed identification of lines in the spectral region centred at 15 555 Å, covering the wavelength range 15 525-15 590 Å. C, N, and O abundances are tentatively derived for the sample stars.

Original languageEnglish
Article numberA16
JournalAstronomy and Astrophysics
Volume648
DOIs
Publication statusPublished - 1 Apr 2021

Keywords

  • Galaxy: bulge
  • Globular clusters: individual: AL 3
  • Globular clusters: individual: HP 1
  • Globular clusters: individual: NGC 6558
  • Stars: abundances
  • Stars: atmospheres

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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