Volume 493, Number 3, January III 2009
|Page(s)||1075 - 1080|
|Section||Stellar structure and evolution|
|Published online||06 November 2008|
II. The local group galaxies IC 1613 and NGC 3109
INAF, Osservatorio Astronomico di Roma Viale del Parco Mellini 84, 00136 Roma, Italy e-mail: email@example.com
2 Département de Physique, Université de Montréal, C.P. 6128, Succursale Centre-Ville, Montréal, Qc, H3C 3J7, Canada e-mail: firstname.lastname@example.org
Accepted: 3 October 2008
Context. Thousands of C stars have been identified in Local Group galaxies using narrow band photometry. To survey C stars at larger distances and alternative to the narrow-band approach is needed.
Aims. We obtain, from ESO Archive data, NIR magnitudes and colours of previously known C stars in two dwarf irregular Local Group galaxies, namely IC 1613 and NGC 3109.
Methods. We compare the NIR magnitudes and colours of the C star populations, previously identified from narrow band techniques to estimate the star formation history of their intermediate-age populations.
Results. We demonstrate that the photometric properties of C stars show a wider range in the NIR than in the optical. As confirmed by models we see, among the four galaxies investigated with a 0.7 dex metallicity range, little if any metallicity effect in the C star colour distribution.
Key words: stars: AGB and post-AGB / stars: carbon / galaxies: dwarf
© ESO, 2009
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.