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Issue A&A Volume 393, Number 2, October II 2002 Page(s) 573 - 583 Section Formation, structure and evolution of stars DOI 10.1051/0004-6361:20021042

A&A 393, 573-583 (2002)
DOI: 10.1051/0004-6361:20021042

AGAPEROS: Searching for variable stars in the LMC Bar

II. Temporal and near-IR analysis of Long-Period Variables

T. Lebzelter¹, M. Schultheis² and A. L. Melchior<sup>3

1</sup>  Institut für Astronomie, Türkenschanzstr. 17, 1180 Wien, Austria
²  Institut d'Astrophysique de Paris, CNRS, 98bis Bd Arago, 75014 Paris, France
³  LERMA, Observatoire de Paris, 61 av. de l'Observatoire, 75014 Paris, France

(Received 21 May 2002 / Accepted 11 July 2002)

Abstract
We analysed the light curves of a large sample of long period variables in the LMC from the AGAPEROS catalogue. The (non)regularity of the light change is discussed in detail showing that the majority of the light curves cannot be described properly by a single period. We show that semiregular and small amplitude variability do not necessarily correlate as has been assumed in several previous studies. Using near-infrared data from the DENIS survey we correlate the light change with colours and luminosities of the objects. These results are used to compare long period variables in the LMC with LPVs in the Galactic Bulge and in the solar neighborhood.

Key words: stars: variables: general -- infrared: stars -- Magellanic Clouds -- stars: AGB and post-AGB

Offprint request: M. Schultheis, schulthe@iap.fr

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© ESO 2002

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