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
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- colors. These sources are detected as AGB stars with large mass-loss rates.
(Online publication September 25 2002)