First detection of period doubling in a BL Herculis type star. Observations and theoretical models
R. Smolec, I. Soszynski, P. Moskalik, A. Udalski, M. K. Szymanski, M., Kubiak, G. Pietrzynski, L. Wyrzykowski, K. Ulaczyk, R. Poleski, S. Kozlowski, and P. Pietrukowicz
TL;DR
This paper reports the first observed period-doubling in a BL Herculis star, supported by new models and observations, providing insights into its stellar parameters and behavior.
Contribution
It presents the first detection of period doubling in a BL Herculis star, confirmed by observations and supported by new theoretical models.
Findings
First detection of period doubling in a BL Herculis star
Star located in Galactic bulge with P=2.4 days
Constraints on stellar parameters like mass and metallicity
Abstract
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.
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