Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...316l...1m&link_type=abstract
Astronomy and Astrophysics, Vol. 316, No. 1, p. L1 - L4
Astronomy and Astrophysics
Astrophysics
30
Magellanic Clouds -- Galaxies: Star Clusters: -- Stars: Evolution -- Stars: Agb And Post-Agb Stars: Carbon, Magellanic Clouds: Carbon Stars, Magellanic Clouds: Star Clusters, Magellanic Clouds: Stellar Evolution, Magellanic Clouds: Agb Stars
Scientific paper
Examining the available data for AGB stars in the Large Magellanic Cloud (LMC) clusters, the authors address the question about the mass interval of low- and intermediate-mass stars which eventually evolve into carbon stars (C stars) during the TP-AGB phase. They combine the data compiled by Frogel, Mould and Blanco (1990) - near infrared photometry and spectral classification for luminous AGB stars in clusters - with the ages for individual clusters derived from independent methods. The resulting distribution of C stars in the Mbol-log(age) plane shows that the upper and the lower limits of the mass range for the formation of C stars cannot be derived from cluster data. The explanation of this resides in the presence of two different periods of quiescence in the cluster formation history of the LMC, shaping the age (and progenitor mass) distribution of C stars. The most recent of these quiescence episodes could also explain the lack of very luminous AGB stars (with -6 > Mbol > -7) in the clusters, contrary to what is observed in the field. Finally the authors compare the distribution of C stars in the Mbol-log(age) diagram with synthetic models of AGB evolution which were previously constrained to reproduce the observed luminosity function of C stars in the field. These models provide a good description of the relative frequency of M-type versus C-type stars.
Chiosi Cesare
Girardi Leo
Marigo Paola
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