Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai 400 005, India
2 Institut d'Astrophysique de Paris, CNRS, 98bis Bld. Arago, 75014 Paris, France e-mail: firstname.lastname@example.org
3 GEPI, Observatoire de Paris, 61 Av. de l'Observatoire, 75014, Paris, France
4 Physical Research Laboratory, Navarangpura, Ahmedabad 380009, India
Corresponding author: D. K. Ojha, email@example.com
Accepted: 11 February 2003
We present a study of ISOGAL sources in the “intermediate” galactic bulge (, –4°), observed by ISOCAM at 7 and 15 μm. In combination with near-infrared (I, J, Ks) data of DENIS survey, complemented by 2MASS data, we discuss the nature of the ISOGAL sources, their luminosities, the interstellar extinction and the mass-loss rates. A large fraction of the 1464 detected sources at 15 μm are AGB stars above the RGB tip, a number of them show an excess in (–)0 and (Ks–)0 colours, characteristic of mass-loss. The latter, especially (Ks–)0, provide estimates of the mass-loss rates and show their distribution in the range 10-8 to 10 yr-1.
Key words: stars: AGB and post-AGB / stars: circumstellar matter / stars: mass-loss / dust: extinction / infrared: stars / Galaxy: bulge
Based on observations with ISO, an ESA project with instruments funded by ESA Member States (especially the PI countries: France, Germany, The Netherlands and the UK) and with the participation of ISAS and NASA.
© ESO, 2003