ISOCAM and DENIS Survey of 0.5 square degrees in the Bar of the LMC. Detection of the whole TP-AGB Star Population

Author(s): Cecile Loup, E. Josselin, Maria-Rosa Cioni, Harm J. Habing, Joris A D L Blommaert, Franz Kerschbaum
Abstract: We surveyed 0.5 square degrees in the Bar of the LMC with ISOCAM at 4.5 and 12 microns, and with DENIS in the I, J, and KS bands. Our goal was to build a complete sample of Thermally-Pulsing AGB stars. Here we present the first analysis of 0.14 square degrees. In total we find about 300 TP-AGB stars. Among these TP-AGB stars, 9% are obscured AGB stars (high mass-loss rates); 9 of them were detected by IRAS, and only 1 was previously identified. Their luminosities range from 2,500 to 14,000 L_odot, with a distribution very similar to the one of optical TP-AGB stars (i.e. those with low mass-loss rates). Such a luminosity distribution, as well as the percentage of obscured stars among TP-AGB stars, is in very good agreement with the evolutionary models of Vassiliadis & Wood (1993) if most of the TP-AGB stars that we find have initial masses smaller than 1.5 to 2 M_odot.
Organisation(s): Department of Astrophysics
External organisation(s): Centre National De La Recherche Scientifique (CNRS), Leibniz-Institut für Astrophysik Potsdam, Leiden University, Katholieke Universiteit Leuven
Pages: 561
Publication date: 1999
Austrian Fields of Science 2012: 103003 Astronomy, 103004 Astrophysics
Portal url: https://ucrisportal.univie.ac.at/en/publications/isocam-and-denis-survey-of-05-square-degrees-in-the-bar-of-the-lmc-detection-of-the-whole-tpagb-star-population(2daf5242-e2e6-435f-8b91-22dff82701a8).html

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