Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-04-23
Astron.Astrophys. 393 (2002) 887-896
Astronomy and Astrophysics
Astrophysics
9 pages, 8 figures, accepted for publication in Astronomy and Astrophysics
Scientific paper
10.1051/0004-6361:20020916
Recently the OGLE experiment has provided accurate light curves and colours for about 2 millions stars in the Small Magellanic Cloud. We have examined this database for its content of Be stars, applying some selection criteria, and we have found a sample of $\sim$ 1000 candidates. Some of these stars show beautiful light curves with amazing variations never observed in any Galactic variable. We find outbursts in 13% of the sample (Type-1 stars), high and low states in 15%, periodic variations in 7%, and the usual variations seen in Galactic Be stars in 65% of the cases. The Galactic counterparts of Type-1 objects could be the outbursting Be stars found by Hubert & Floquet (1998) after the analysis of Hipparcos photometry. We discuss the possibility that Type-1 stars could correspond to Be stars with accreting white dwarf companions or alternatively, blue pre-main sequence stars surrounded by thermally unstable accretion disks. We provide coordinates and basic photometric information for these stars and some examples of light curves.
Gieren Wolfgang
Mennickent Ronald E.
Pietrzynski Grzegorz
Szewczyk Olaf
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