Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2011-11-30
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
Proceedings of the 20th Stellar Pulsation Conference Series: "Impact of new instrumentation & new insights in stellar pulsatio
Scientific paper
We report on the discovery of the first BL Herculis star displaying period-doubling behaviour as predicted by the hydrodynamic models of Buchler & Moskalik. The star, with P=2.4d, is located in the Galactic bulge and was discovered with OGLE-III photometry. We present new nonlinear convective models, which, together with recent evolutionary tracks, put constraints on the stellar parameters. In particular, we estimate the mass and metallicity of the object.
Kozlowski Stanislaw
Kubiak Mateo M. M.
Moskalik Pawel
Pietrukowicz Pawel
Pietrzynski Grzegorz
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