Stellar sources in the ISOGAL intermediate bulge fields

Ojha, D. K. ; Omont, A. ; Schuller, F. ; Simon, G. ; Ganesh, S. ; Schultheis, M. (2003) Stellar sources in the ISOGAL intermediate bulge fields Astronomy & Astrophysics, 403 (1). pp. 141-154. ISSN 0004-6361

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Official URL: http://www.aanda.org/articles/aa/abs/2003/19/aah37...

Related URL: http://dx.doi.org/10.1051/0004-6361:20030208

Abstract

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. 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])0and (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 10−5 M yr−1.

Item Type:Article
Source:Copyright of this article belongs to European Southern Observatory.
Keywords:Stars: AGB and Post-AGB; Stars: Circumstellar Matter; Stars: Mass-Loss; Dust: Extinction; Infrared: Stars; Galaxy: Bulge
ID Code:105299
Deposited On:26 Apr 2017 17:07
Last Modified:26 Apr 2017 17:07

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