Obscured Asymptotic Giant Branch stars in the Magellanic Clouds III. New IRAS counterparts

Details Obscured Asymptotic Giant Branch stars in the Magellanic Clouds III. New IRAS counterparts Obscured Asymptotic Giant Branch stars in the Magellanic Clouds III. New IRAS counterparts

1997-04-21

arxiv.org/abs/astro-ph/9704201v1

Astron.Astrophys.325:585-600,1997

Astronomy and Astrophysics

Astrophysics

17 pages (LaTeX source and 16 PostScript figures). Accepted for publication in Astronomy and Astrophysics Main Journal

Scientific paper

We have searched for near-infrared stellar counterparts of IRAS point sources in the Large Magellanic Cloud (LMC), in J and K-bands. This resulted in the detection of 21 counterparts, of which 19 are new discoveries. Using colour-magnitude and colour-colour diagrams, we identify 13 Asymptotic Giant Branch (AGB) stars with thick circumstellar dust envelopes, 7 possible early post-AGB stars or stars recovering from a thermal pulse, and 1 red supergiant or foreground star. For 10 of the IRAS targets we do not succeed in detecting and/or identifying a near-infrared counterpart. We serendipitously detect 14 other red sources, of which 2 are known Long Period Variables, and a few galaxies. The near-infrared and optical colours of the galaxies may indicate considerable interstellar extinction through the LMC, as much as A_V about 2-4 mag. The relative number of AGB carbon stars over oxygen stars is shown to decrease as the luminosity increases. Yet amongst the faintest mass-losing AGB stars oxygen-rich stars still exist, which puts constraints on current convection theories that predict the occurrence of third dredge-up and Hot Bottom Burning. We investigate the nature of some LMC stars that have infrared properties very similar to suspected Galactic post-AGB stars.

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