Stellar sources in the ISOGAL intermediate bulge fields

Details Stellar sources in the ISOGAL intermediate bulge fields Stellar sources in the ISOGAL intermediate bulge fields

2003-03-06

arxiv.org/abs/astro-ph/0303137v1

Astron.Astrophys. 403 (2003) 141-154

Astronomy and Astrophysics

Astrophysics

16 pages, accepted for publication in Astronomy and Astrophysics

Scientific paper

10.1051/0004-6361:20030208

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$_{\rm s}$) 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])$_{\rm 0}$ and (K$_{\rm s}$-[15])$_{\rm 0}$ colours, characteristic of mass-loss. The latter, especially (K$_{\rm s}$-[15])$_{\rm 0}$, provide estimates of the mass-loss rates and show their distribution in the range 10$^{-8}$ to 10$^{-5}$ M$_{\rm \odot}$/yr.

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