The mid- and far-infrared colours of AGB and post-AGB stars

Free access article

Issue		A&A Volume 448, Number 1, March II 2006


Page(s)		181 - 187
Section		Galactic structure, stellar clusters and populations
DOI		http://dx.doi.org/10.1051/0004-6361:20054163

A&A 448, 181-187 (2006)
DOI: 10.1051/0004-6361:20054163

The mid- and far-infrared colours of AGB and post-AGB stars

M. A. T. Groenewegen

Instituut voor Sterrenkunde, Katholieke Universiteit Leuven, Celestijnenlaan 200B, 3001 Leuven, Belgium
e-mail: groen@ster.kuleuven.be

(Received 6 September 2005 / Accepted 27 October 2005 )

Abstract
With the advent of space missions, like SPITZER and ASTRO-F, with sensitive detectors in the near- and mid-infra red covering a reasonable field-of-view and having a good spatial resolution, it will be possible to detect individual AGB stars in Local Group galaxies. The filters used by these missions are non-standard and different from mission to mission. In this paper, the colours of mass-losing AGB and post-AGB stars are calculated in the broad-band filters of the SPITZER and ASTRO-F missions, as well as Bessell V,I and 2MASS J,H,K to connect these results to existing ground-based data. The models are calculated for carbon- and oxygen-rich chemistry and cover different effective temperatures and dust compositions.

Key words: stars: circumstellar matter -- stars: mass-loss -- stars: AGB and post-AGB

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