Stellar sources in the ISOGAL intermediate bulge fields

Abstract

We present a study of ISOGAL sources in the "intermediate" galactic bulge ($|$$l$$|$ $<$ 2${}^{\circ }$, $|$$b$$|$ $\sim$ 1${}^{\circ }$--4${}^{\circ }$), observed by ISOCAM at 7 and 15 $\mu m$. In combination with near-infrared (I, J, K${}_{\mathrm{s}}$) 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 $\mu m$ are AGB stars above the RGB tip, a number of them show an excess in ([7]-[15])${}_0$ and (K${}_{\mathrm{s}}$-[15])${}_0$ colours, characteristic of mass-loss. The latter, especially (K${}_{\mathrm{s}}$-[15])${}_0$, provide estimates of the mass-loss rates and show their distribution in the range 10${}^{-8}$ to 10${}^{-5}$ M${}_{\odot }$/yr.

16 pages, accepted for publication in Astronomy and Astrophysics

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• 86 GHz SiO maser survey of late-type stars in the Inner Galaxy III. Interstellar extinction and colours of the SiO targets
• New galactic star clusters discovered in the VVV survey. Candidates projected on the inner disk and bulge
• Three dimensional interstellar extinction map towards the Galactic Bulge
• Interstellar Extinction and Long-Period Variables in the Galactic Center
• Explanatory Supplement of the ISOGAL-DENIS Point Source Catalogue
• Near-IR spectra of ISOGAL sources in the Inner Galactic Bulge
• ISO Mid-Infrared Spectroscopy of Galactic Bulge AGB Stars
• 86 GHz SiO maser survey of late-type stars in the Inner Galaxy II. Infrared photometry of the SiO Target Stars
• Late-type giant variables in NGC6522, LMC and SMC: How do they differ?
• The ISOGAL field FC--01863+00035: Mid-IR interstellar extinction and stellar populations
• Understanding AGB evolution in Galactic bulge stars from high-resolution infrared spectroscopy
• Recent star formation in the inner Galactic Bulge seen by ISOGAL. I - Classification of bright mid-IR sources in a test field
• Polycyclic aromatic hydrocarbon emission toward the Galactic bulge
• Infrared colours and bolometric corrections of SiO masing stars in the inner Milky Way
• Stellar populations in a standard ISOGAL field in the Galactic disk