ISO observations of the Magellanic Clouds globular clusters

Details ISO observations of the Magellanic Clouds globular clusters ISO observations of the Magellanic Clouds globular clusters

Mar 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999esasp.427..409t&link_type=abstract

The Universe as Seen by ISO. Eds. P. Cox & M. F. Kessler. ESA-SP 427., p. 409

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Agb And Post-Agb, Carbon Stars, Stellar Evolution, Magellanic Clouds

Scientific paper

We here present the results of our systematic observations of AGB stars in the intermediate-age Magellanic Clouds clusters. Mid-infrared stars discovered in NGC 419 and NGC 1978 are very red and must be undergoing intense mass-loss (comparable to superwinds). Their CAM CVF spectra show that they are carbon stars. Three optically visible carbon stars as well as (at least) 2 near-infrared carbon stars observed with PHOT seem to show 60 μm excesses which may indicate mass-loss in the past, while mid-infrared stars do not seem to show any far-infrared excess. It seems that the mid-infrared stars are fainter than the AGB tip luminosity and that their luminosities are close to those of the transition luminosity from M type to C stars. Therefore, these obscured mid-infrared stars may not be in the final stage of the AGB phase. This may suggest that AGB stars lose mass heavily at some other time, possibly during the transition from M type to C stars.

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