Volume 416, Number 1, March II 2004
|Page(s)||111 - 118|
|Published online||26 February 2004|
X. Wolf-Lundmark-Melotte a galaxy with an extreme C/M ratio
INAF, Osservatorio Astronomico di Roma Viale del Parco Mellini 84, 00136 Roma, Italia
2 Département de Physique, Université de Montréal, CP 6128, Succursale Centre-Ville, Montréal, Québec H3C 3J7, Canada e-mail: firstname.lastname@example.org
Corresponding author: P. Battinelli, email@example.com
Accepted: 26 November 2003
We used the CFH12K wide field camera to survey the carbon star population of the Wolf-Lundmark-Melotte system using the CN–TiO technique. 149 C stars are identified with a mean , corresponding to , a mean luminosity similar to what we found in other irregular galaxies. Star counts in and around the main body of WLM reveal that its stellar distribution is quite elliptical (ϵ = 0.58) with major and minor axes of 26' and 11'. Comparison of the density profile of C stars and old red giants shows that their scale lengths differ by only 15% pointing to mixed populations. WLM is found to be unique among dwarf irregular galaxies by having essentially a handful of early-type AGB M stars thus leading to an extreme C/M ratio. We conclude that like NGC 3109, WLM is a disk shaped galaxy, seen at an inclination of and devoid of an extended spherical stellar halo.
Key words: galaxies: individual: Wolf-Lundmark-Melotte
Based on observations carried out at the Canada-France-Hawaii Telescope, operated by the National Research Council of Canada, the Centre National de la Recherche Scientifique de France, and the University of Hawaii.
© ESO, 2004
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.