Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-12-09
Astron.Astrophys. 399 (2003) L47
Astronomy and Astrophysics
Astrophysics
submitted to A&A letters
Scientific paper
10.1051/0004-6361:20030106
We report the discovery, based on an inspection of the OGLE-II database, of a group of blue variables in the Magellanic Clouds showing simultaneously two kinds of photometric variability: a short-term cyclic variability with typical amplitude $\Delta I \sim$ 0.05 mag and period $P_{1}$ between 4 and 16 days and a sinusoidal, long-term cyclic oscillation with much larger amplitude $\Delta I \sim$ 0.2 mag with period $P_{2}$ in the range of 150-1000 days. We find that both periods seems to be coupled through the relationship $P_{2}$ = 35.2 $\pm$ 0.8 $P_{1}$. In general, the short term variability is reminiscent of those shown by Algol-type binaries. We propose that the long-term oscillation could arise in the precession of a elliptical disc fed by a Roche-lobe filling companion in a low mass ratio Algol system.
Díaz Marco
Gieren Wolfgang
Mennickent Ronald E.
Pietrzynski Grzegorz
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