2000/09/26 by Leticia Carigi, Carigi, Leticia, Gustavo Bruzual +1
Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysics #Astrophysics (astro-ph) #Chemical evolution #Demography #FOS: Physical sciences #Galaxy #Galaxy formation and evolution #Physics #Population #Star formation #Stellar mass #Stellar population #Stellar, planetary, and galactic studies #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/0009419
published in arXiv (Cornell University) (Cornell University) · 2 pages, for ASP Conf. Ser.:"Galaxy Disks and Disk Galaxies", eds. J.G. Funes S.J. and E.M . Corsini
arxiv created 2000/09/26 · openalex publication_date 2000/09/26 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
Photometric properties of stellar populations that evolve according to chemical evolution models developed by Carigi, Colin, & Peimbert (1999) and Carigi & Peimbert (2001) are explored. Models explain the oxygen abundance and gas mass fraction of irregular galaxies NGC 1560, I Zw 18, NGC 2366, and a typical irregular galaxy. The photometric predictions help to narrow down the range of possible chemical evolution models. Observed colors of I Zw 18 imply an age of 108 - 109 yr for its dominant population, while 109 - 1010 yr is an older age preferred by the rest of the galaxy sample. Observed colors are in general, within errors, close to predicted. There is a tendency for the observed (B-V) color to imply higher metallicities at a fixed age than (U-B) (equivalently, (U-B) implies younger ages than (B-V)).