2003/12/18 by Jun Ma, Xu Zhou, Jiansheng Chen
Physics and Astronomy · #Astronomy #Astronomy and Astrophysical Research #Astrophysics #Galaxies: Formation, Evolution, Phenomena #Galaxy #Globular cluster #Metallicity #Physics #Spiral galaxy #Star cluster #Star formation #Stellar population #Stellar, planetary, and galactic studies #astro-ph
paper · pdf · doi:10.1051/0004-6361:20031556
published as Astron.Astrophys.413:563-570,2004 · Accepted for Publication in A&A, 13 pages, 7 figures (1 figure of jpg)
openalex publication_date 2003/12/18 · arxiv created 2005/03/29 · arxiv updated 2014/10/13 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Using the theoretical stellar population synthesis models of BC96, Kong et al. (2003) showed that some BATC colors and color indices could be used to disentangle the age and metallicity effect. They found that there is a very good relation between the flux ratio of and the metallicity for stellar populations older than 1 Gyr. In this paper, based on the Kong et al. results and on the multicolor spectrophotometry of Ma et al. ([CITE], [CITE]a,b,c), we estimate the metallicities of 31 old star clusters in the nearby spiral galaxy M 33, 23 of which are “true” globular clusters. The results show that most of these old clusters are metal poor. We also find that the ages and metal abundance for these old star clusters of M 33 do not vary with deprojected radial position.