| Issue |
A&A
Volume 403, Number 1, May III 2003
|
|
|---|---|---|
| Page(s) | 141 - 154 | |
| Section | Stellar structure and evolution | |
| DOI | https://doi.org/10.1051/0004-6361:20030208 | |
| Published online | 29 April 2003 | |
Stellar sources in the ISOGAL intermediate bulge fields *,**,***
1
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: This email address is being protected from spambots. You need JavaScript enabled to view it.
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, This email address is being protected from spambots. You need JavaScript enabled to view it.
Received:
3
June
2002
Accepted:
11
February
2003
Abstract
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
([7]–[15])0 and (Ks–[15])0 colours,
characteristic of
mass-loss. The latter, especially (Ks–[15])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
This is paper No. 14 in a refereed journal based on data from the ISOGAL project.
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.
Based on observations collected at the European Southern Observatory, La Silla, Chile.
© ESO, 2003
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