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Astron. Astrophys. 327, 240-244 (1997)

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Luminosity and related parameters of [FORMULA] Scuti stars
from Hipparcos parallaxes

General properties of luminosity *

E. Antonello and L. Mantegazza

Osservatorio Astronomico di Brera, Via E. Bianchi 46, I-22055 Merate, Italy (elio@merate.mi.astro.it)

Received 24 April 1997 / Accepted 16 June 1997

Abstract

The absolute magnitudes of [FORMULA] Scuti stars derived from parallaxes measured by the Hipparcos astrometric satellite are discussed and compared with the previous estimates based on photometric [FORMULA] indices. There are significant differences which are related to photometric effects of metallicity and rotational velocity, but the possible effect of a close companion on the measured apparent magnitude should be also taken into account. The possibility of different groupings of [FORMULA] Scuti stars based on the absolute magnitudes is briefly discussed. Some high amplitude [FORMULA] Scuti stars with intermediate or normal metallicity and small and uncertain parallax have apparently a very low luminosity; this could be a systematic effect related to the observational errors.

Key words: stars: distances - stars: fundamental parameters - [FORMULA] Sct

* Based on data from Hipparcos astrometry satellite

Send offprint requests to: E. Antonello

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© European Southern Observatory (ESO) 1997

Online publication: April 8, 1998
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