Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-09-10
Astronomy and Astrophysics
Astrophysics
3 pages, 7 figures, to be published in ASP Conference Series, Interplay between periodic, cyclic and stochastic variability in
Scientific paper
The recent discovery, based on a search of public OGLE data, of Be star candidates in the Small Magellanic Cloud showing spectacular photometric variations (Mennickent et al. 2002), has motivated further analysis of their light curves. Here we report the results of a statistical study of the light curves of Type-1, Type-2 and Type-3 stars. Type-3 stars show a bimodal period distribution, with a main, broad peak, between 20 and 130 days, and a narrower, secondary peak, between 140 and 210 days. We also find that, among Type-3 stars, the maximum amplitude of oscillation correlates with the system luminosity, in the sense that only low luminosity systems show large amplitude oscillations. In general, the amplitude of these oscillations tends to increase with the photometric period. A parametric study shows no correlation between the amplitude, duration and asymmetry of Type-1 outbursts, and amplitude of Type-2 jumps, with the available stellar photometric parameters.
Gieren Wolfgang
Mennickent Ronald E.
Pietrzynski Grzegorz
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