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

Autor(es):Mostrar menos -

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

• Tipo de documento: Artigo Científico
• Fonte: Astronomy & Astrophysics; v. 648, p. 13-pg., 2021-04-07.

Resumo

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 angstrom, covering the wavelength range 15 525-15 590 angstrom. C, N, and O abundances are tentatively derived for the sample stars. (AU)

• Processo FAPESP: 18/03480-7 - Modelamento de espectros integrados de aglomerados globulares e galáxias
• Beneficiário: Tatiana Coelho de Moura Bastos
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 17/15893-1 - Órbitas de aglomerados globulares do bojo: formação e evolução da Via Láctea
• Beneficiário: Maria de Los Angeles Perez Villegas
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado