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Astron. Astrophys. 327, 240-244

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Luminosity and related parameters of 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


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

© European Southern Observatory (ESO) 1997

Online publication: October 1, 1997
Last change: April 8, 1998