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A&A Supplement Ser., Vol. 124, July 1997, 143-151

Received September 13; accepted November 16, 1996

Mean light curves of long-period variables and discrimination between carbon- and oxygen-rich stars

M.O. Mennessiertex2html_wrap1568, H. Boughalebtex2html_wrap1570, and J.A. Matteitex2html_wrap1572

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tex2html_wrap1574  Université Montpellier II, Groupe de Recherche en Astronomie et Astrophysique du Languedoc, Unité associée au CNRS, F-34095 Montpellier Cedex 5, France
tex2html_wrap1576  American Association of Variable Star Observers, 25 Birch Street, Cambridge, Massachusetts 02138-1205, U.S.A.
tex2html_wrap1578  Université des Sciences El Jadida, Maroc


Using 75 years of AAVSO data, mean light curve parameters of a sample of 355 long period M, S, and C mira and semi-regular variable stars are investigated. We present a classification of the light curves of LPVs into 6 distinct groups. Combining this classification with IRAS colors makes it possible to distinguish oxygen-rich from carbon-rich miras.gif

keywords: stars: AGB, post-AGB -- methods: data analysis -- stars: carbon -- stars: variables

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