EAS Publications Series

Table of Contents - 2002 - Volume 4, Infrared and Submillimeter Space Astronomy: An International Colloquium to Honor the Memory of Guy Serra  

Session II: Structure of the ISM and Star Formation

Stellar sources in the ISOGAL outer bulge fields (7 and 15 μm ISOCAM observations)

Infrared and Submillimeter Space Astronomy: An International Colloquium to Honor the Memory of Guy Serra, Toulouse, France.

D. K. Ojhaa1, A. Omonta2, F. Schullera2, G. Simona3 and the ISOGAL Collaboration

a1 Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai-400005, India

a2 Institut d'Astrophysique de Paris, CNRS, 98bis Bd. Arago, 75014 Paris, France

a3 DASGAL, Observatoire de Paris, 61 avenue de l'Observatoire, 75014 Paris, France

Abstract

We report the study of ISOGAL fields in the outer galactic bulge. We have combined 7 and 15 μm ISOCAM observations with DENIS IJKs near-infrared data to determine the nature of the sources and the interstellar extinction. Most of the ISOGAL sources show evolution of mass-loss rates in the range 10-8 to 10-6 M⊙/year. Most of the detected sources are red giants above the RGB tip; a few of them show an excess in and J - Ks-[15] colors. These sources are detected as AGB stars with large mass-loss rates.

(Online publication September 25 2002)