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

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003assl..283...35o&link_type=abstract

In: Mass-losing pulsating stars and their circumstellar matter. Workshop, May 13-16, 2002, Sendai, Japan, edited by Y. Nakada, M

Astronomy and Astrophysics

Astrophysics

Stars: Agb And Post-Agb, Stars: Circumstellar Matter, Galaxy: Bulge

Scientific paper

We present a study of ISOGAL sources in the "intermediate" galactic bulge (|l| < 2°, |b| ~ 1°-4°), observed by ISOCAM at 7 and 15 μm (Ojha et al. 2002). In combination with near-infrared (IJKs) data of DENIS survey, we discuss the nature of the ISOGAL sources, their luminosities, the interstellar extinction and the mass-loss rates. A large fraction of the 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 colors, characteristic of mass-loss. The latter, especially (Ks-[15])0, allow estimation of the mass-loss rates and show their distribution in the range 10-8 to 10-5 Msolar/yr.

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