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Title:
Carbon stars and C/M ratio in the WLM dwarf irregular galaxy
Authors:
Valcheva, A. T.; Ivanov, V. D.; Ovcharov, E. P.; Nedialkov, P. L.
Affiliation:
AA(Department of Astronomy, University of Sofia, 5 James Bourchier, Sofia 1164, Bulgaria ), AB(European Southern Observatory, Ave. Alonso de Cordova 3107, Casilla 19, Santiago 19001, Chile ), AC(Department of Astronomy, University of Sofia, 5 James Bourchier, Sofia 1164, Bulgaria ), AD(Department of Astronomy, University of Sofia, 5 James Bourchier, Sofia 1164, Bulgaria )
Publication:
Astronomy and Astrophysics, Volume 466, Issue 2, May I 2007, pp.501-507 (A&A Homepage)
Publication Date:
05/2007
Origin:
EDP Sciences
Keywords:
galaxies: individual: WLM, stars: AGB and post-AGB, stars: carbon, galaxies: irregular, Local Group
DOI:
10.1051/0004-6361:20054536
Bibliographic Code:
2007A&A...466..501V

Abstract

We identify the rich carbon star population of the Magellanic-type dwarf irregular galaxy WLM (Wolf-Lundmark-Melotte) and study its photometric properties from deep near-IR observations. The galaxy also exhibits a clear presence of oxygen-rich population. We derive a carbon to M-star ratio of C/M = 0.56±0.12, relatively high in comparison with many galaxies. The spatial distribution of the AGB stars in WLM hints at the presence of two stellar complexes with a size of a few hundred parsecs. Using the H I map of WLM and the derived gas-to-dust ratio for this galaxy N(H I)/E(B-V) = 60±10 [ 1021 at. cm-2 mag-1] we re-determined the distance modulus of WLM from the IR photometry of four known Cepheids, obtaining (m-M)0 = 24.84±0.14 mag. In addition, we determine the scale length of 0.75±0.14 kpc of WLM disk in the J-band.

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