Membership of 23 stars towards the bulge globular clusters NGC 6528 and NGC 6553
| Autor: | M. N. Perrin, Beatriz Barbuy, Thais Eunice Pires Idiart, Sergio Ortolani, Paula Coelho, Ricardo P. Schiavon, E. Bica |
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| Rok vydání: | 2001 |
| Předmět: |
Physics
Low resolution Astrophysics (astro-ph) FOS: Physical sciences Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Composicao estelar Horizontal branch Aglomerados estelares globulares Espectros estelares Spectral line Red-giant branch Stars Space and Planetary Science Bulge abundances [Stars] Globular cluster Astrophysics::Solar and Stellar Astrophysics Astrophysics::Earth and Planetary Astrophysics globular: NGC 6528 NGC 6553 [Clusters] Spectroscopy Astrophysics::Galaxy Astrophysics |
| Zdroj: | Scopus-Elsevier Repositório Institucional da UFRGS Universidade Federal do Rio Grande do Sul (UFRGS) instacron:UFRGS |
| ISSN: | 1432-0746 0004-6361 |
| DOI: | 10.1051/0004-6361:20010976 |
| Popis: | Low resolution spectra of 23 stars towards the bulge globular clusters NGC 6528 and NGC 6553 are analysed. Radial velocities and atmospheric parameters are derived in order to check their membership in the clusters. Effective temperatures were obtained from photometric data for stars with Teff > 3800 K, whereas for cooler stars, they were derived from equivalent widths of TiO bands. Calibrations of W(TiO) as a function of stellar parameters based on a grid of synthetic spectra are presented. Metallicities were derived from a comparison of the observed spectra to a grid of synthetic spectra. The sample comprises evolutionary stages from the Red Giant Branch to the Horizontal Branch, with parameters in the range 3200 Accepted for publication in A&A |
| Databáze: | OpenAIRE |
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