A&A Supplement series, Vol. 122, May I 1997, 489-494
Received June 13; accepted August 21, 1996
F. Guglielmo, N. Epchtein, F. Arditti, - F. Sèvre
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Leiden Observatory, NL-2300 RA Leiden, The Netherlands
Observatoire de Paris, Département de Recherche Spatiale, URA CNRS 264, F-92195 Meudon Principal Cedex, France
Université de Paris X-Nanterre, F-92000 Nanterre Cedex, France
Institut d'Astrophysique de Paris, CNRS UPR 341, F-75014 Paris, France
We present new results of a search for infrared carbon stars (IRCS) based on the combination of IRAS and near infrared colours. A sample of 207 stars with IRAS colours that characterize IRCS is selected and measured in the JHKL photometric bands. Using a [12 - 25] vs. K - L colour diagram, 20 new IRCS candidates are proposed. Medium resolution spectra in the Å range of 8 of these candidates confirm their carbon rich nature. In addition we propose a few stars with LRS class "4n" as oxygen-rich candidates, and a few stars with LRS classes "0n" and "1n" as carbon-rich.
keywords: stars: carbon -- stars: late-type -- stars: AGB and Post-AGB -- galaxy: stellar content -- infrared: stars -- stars: circumstellar matter