Stellar sources in the ISOGAL intermediate bulge fields

作者：Ojha DK^*; Omont A; Schuller F; Simon G; Ganesh S; Schultheis M

来源：Astronomy & Astrophysics, 2003, 403(1): 141-154.

DOI：10.1051/0004-6361:20030208

• stars : AGB and post-AGB
• stars : circumstellar matter
• stars : mass-loss
• dust : extinction
• infrared : stars
• Galaxy : bulge

We present a study of ISOGAL sources in the "intermediate" galactic bulge (\l\<2 degrees, vertical bar b vertical bar similar to 1 degrees-4 degrees), observed by ISOCAM at 7 and 15 mu m. In combination with near-infrared (I, J, K(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(s)-[15])(0) colours, characteristic of mass-loss. The latter, especially (K(s)-[15])(0), provide estimates of the mass-loss rates and show their distribution in the range 10(-8) to 10(-5) M(circle dot) yr(-1).

• 出版日期2003-5