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

Published online by Cambridge University Press:  25 May 2016

C. Loup ,
E. Josselin ,
M.-R. Cioni ,
H.J. Habing ,
J.A.D.L. Blommaert ,
N.R. Trams ,
M.A.T. Groenewegen ,
C. Alard ,
P. Fouqué  and
F. Kerschbaum
...Show all authors
C. Loup
Affiliation:
Institut d'Astrophysique de Paris, CNRS, 98bis bd Arago, F-75014 Paris, France
E. Josselin
Affiliation:
Institut d'Astrophysique de Paris, CNRS, 98bis bd Arago, F-75014 Paris, France
M.-R. Cioni
Affiliation:
Sterrewacht Leiden, Postbus 9513, 2300 RA Leiden, the Netherlands
H.J. Habing
Affiliation:
Sterrewacht Leiden, Postbus 9513, 2300 RA Leiden, the Netherlands
J.A.D.L. Blommaert
Affiliation:
ISO Data Centre, Astrophysics Div. of ESA, Villafranca, Spain
N.R. Trams
Affiliation:
ISO Data Centre, Astrophysics Div. of ESA, Villafranca, Spain
M.A.T. Groenewegen
Affiliation:
Max-Planck-Institut für Astrophysik, Garching, Germany
C. Alard
Affiliation:
Observatoire de Paris, France
P. Fouqué
Affiliation:
Observatoire de Paris, France
F. Kerschbaum
Affiliation:
Institut für Astronomie, A-1180 Wien, Austria
L.B.F.M. Waters
Affiliation:
University of Amsterdam, the Netherlands
J.Th. van Loon
Affiliation:
University of Amsterdam, the Netherlands
A.A. Zijlstra
Affiliation:
UMIST, Manchester, UK

Abstract

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We surveyed 0.5 square degrees in the Bar of the LMC with ISOCAM at 4.5 and 12 μm, 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⊙, 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⊙.

Type
Part 6. AGB Stars as a Population of Various Galaxies
Information
Symposium - International Astronomical Union , Volume 191: Asymptotic Giant Branch Stars , 1999 , pp. 561 - 566
Copyright
Copyright © Astronomical Society of the Pacific 1999 

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