Bibcode
Dell'Agli, F.; Di Criscienzo, M.; Ventura, P.; Limongi, M.; García-Hernández, D. A.; Marini, E.; Rossi, C.
Referencia bibliográfica
Monthly Notices of the Royal Astronomical Society, Volume 479, Issue 4, p.5035-5048
Fecha de publicación:
10
2018
Número de citas
19
Número de citas referidas
17
Descripción
We study the evolved stellar population of the Local Group galaxy IC10,
with the aim of characterizing the individual sources observed and to
derive global information on the galaxy, primarily the star-formation
history and the dust production rate. To this aim, we use evolutionary
sequences of low- and intermediate-mass (M < 8 M_{⊙}) stars,
evolved through the asymptotic giant branch phase, with the inclusion of
the description of dust formation. We also use models of higher mass
stars. From the analysis of the distribution of stars in the
observational planes obtained with infrared bands, we find that the
reddening and distance of IC10 are E(B - V) = 1.85 mag and d = 0.77 Mpc,
respectively. The evolved stellar population is dominated by carbon
stars that account for 40{ per cent} of the sources brighter than the
tip of the red giant branch. Most of these stars descend from {˜ }
1.1-1.3 M_{⊙} progenitors, formed during the major epoch of star
formation, which occurred ˜2.5 Gyr ago. The presence of a
significant number of bright stars indicates that IC10 has been the site
of significant star formation in recent epochs and currently hosts a
group of massive stars in the core helium-burning phase. Dust production
in this galaxy is largely dominated by carbon stars; the overall dust
production rate estimated is 7× 10^{-6} M_{⊙} yr-1.
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