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Astron. Astrophys. 353, 322-334 (2000)

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Optical and near-infrared spectrophotometric properties of Long Period Variables and other luminous red stars

R. Alvarez 1, A. Lançon 2, B. Plez 3 and P.R. Wood 4

1 IAA, Université Libre de Bruxelles, C.P. 226, Bvd du Triomphe, 1050 Bruxelles, Belgium (ralvarez@astro.ulb.ac.be)
2 Observatoire de Strasbourg, UMR 7550, 11 Rue de l'Université, 67000 Strasbourg, France (lancon@astro.u-strasbg.fr)
3 GRAAL, Université Montpellier II, cc072, 34095 Montpellier cedex 05, France (plez@graal.univ-montp2.fr)
4 RSAA (ANU), Mount Stromlo Observatory, Private Bag, Weston Creek, ACT 2611, Australia (wood@mso.anu.edu.au)

Received 6 August 1999 / Accepted 29 October 1999

Abstract

Based on a new and large sample of optical and near-infrared spectra obtained at the Mount Stromlo and Siding Spring Observatories (Lançon & Wood 1998; Lançon & Wood, in preparation), spectrophotometric properties of cool oxygen- and carbon-rich Long Period Variables and supergiants are presented. Temperatures of oxygen-rich stars are assigned by comparison with synthetic spectra computed from up-to-date oxygen-rich model atmosphere grids. The existence of reliable optical and near-infrared temperature indicators is investigated. A narrow relation between the bolometric correction [FORMULA] and the broad-band colour I-J is obtained for oxygen-rich cool stars. The ability of specific near-infrared indices to separate luminosity classes, atmospheric chemistry or variability subtypes is discussed. Some comments are also given on extinction effects, water band strengths in Long Period Variables and the evaluation of [FORMULA] ratio in red giants.

Key words: stars: AGB and post-AGB – stars: carbon – stars: fundamental parameters – stars: late-type – stars: oscillations

Send offprint requests to: R. Alvarez

Correspondence to: ralvarez@astro.ulb.ac.be

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© European Southern Observatory (ESO) 2000

Online publication: December 8, 1999
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