Volume 399, Number 3, March I 2003
|Page(s)||L47 - L50|
|Published online||14 February 2003|
Letter to the Editor
Double-periodic blue variables in the Magellanic Clouds
Universidad de Concepción, Departamento de Física, Casilla 160–C, Concepción, Chile e-mail: email@example.com, firstname.lastname@example.org
2 Warsaw University Observatory, Al. Ujazdowskie 4,00-478, Warsaw, Poland
3 Instituto Astronômico e Geofísico, Universidade de São Paulo, Brazil e-mail: email@example.com
Corresponding author: R. E. Mennickent, firstname.lastname@example.org
Accepted: 24 January 2003
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 mag and period P1 between 4 and 16 days and a sinusoidal, long-term cyclic oscillation with much larger amplitude mag with period P2 in the range of 150–1000 days. We find that both periods seems to be coupled through the relationship . 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.
Key words: stars: binaries: eclipsing / stars: binaries: close / stars: variable: general / stars: early-type
© ESO, 2003
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