Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...332...25g&link_type=abstract
Astronomy and Astrophysics, v.332, p.25-32 (1998)
Astronomy and Astrophysics
Astrophysics
32
Circumstellar Matter, Stars: Mass Loss, Stars: Agb, Magellanic Clouds, Infrared: Stars
Scientific paper
Near-infrared photometry is obtained of 30 IRAS sources in the direction of the Small Magellanic Cloud selected to be possible AGB stars. Low resolution 4000 to 10 000 Angstroms spectroscopy is presented for 10 of them, plus two AGB stars in the LMC. Improved IRAS fluxes are obtained using the gipsy package. Based on the optical spectra and analyses of colour-colour diagrams 9 are confirmed or likely carbon stars, and 8 are confirmed or likely oxygen-rich AGB stars. In three cases no near-infrared counterpart could be identified. The remaining 10 objects have the colours of mass-losing AGB stars, but not enough information is available to comment on the chemical type. In two of these cases there is a mismatch between the near-infrared and IRAS colours possibly indicating unusually large variability, or misidentification of the IRAS sources. Based on observations obtained at the European Southern Observatory at La Silla, Chile under programs 56.E-0325 and 58.E-0274
Blommaert Joris A. D. L.
Groenewegen Martin A. T.
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