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

Autor(en)

Cecile Loup, E. Josselin, Maria-Rosa Cioni, Harm J. Habing, Joris A D L Blommaert, Franz Kerschbaum

Abstrakt

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(en)

Institut für Astrophysik

Externe Organisation(en)

Centre National De La Recherche Scientifique (CNRS), Leibniz-Institut für Astrophysik Potsdam, Leiden University, Katholieke Universiteit Leuven

Seiten

561

Publikationsdatum

1999

ÖFOS 2012

103003 Astronomie, 103004 Astrophysik

Link zum Portal

https://ucrisportal.univie.ac.at/de/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