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First detection of period doubling in a BL Herculis type star. Observations and theoretical models
R. Smolec, I. Soszynski, P. Moskalik +9
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,…
Discovery of period doubling in BL Herculis stars of the OGLE survey. Observations and theoretical models
R. Smolec, I. Soszynski, P. Moskalik +9
We report the discovery of a period doubling behaviour in a 2.4d BL Herculis-type variable of the Galactic bulge. Another bulge BL Her-type star (P=2.25d) is a strong period doubli…
Non-Blazhko RR Lyrae Stars Observed with the KEPLER Space Telescope
J. M. Nemec, R. Smolec, J. M. Benko +22
This paper summarizes the main results of our recent study of the non-Blazhko RR Lyrae stars observed with the Kepler space telescope. These stars offer the opportunity for studyin…
Fourier analysis of non-Blazhko ab-type RR Lyrae stars observed with the Kepler space telescope
J. M. Nemec, R. Smolec, J. M. Benko +22
Nineteen of the ~40 RR Lyr stars in the Kepler field have been identified as candidate non-Blazhko (or unmodulated) stars. In this paper we present the results of Fourier decomposi…
Variable turbulent convection as the cause of the Blazhko effect - testing the Stothers model
R. Smolec, P. Moskalik, K. Kolenberg +3
The amplitude and phase modulation observed in a significant fraction of the RR Lyrae variables - the Blazhko effect - represents a long-standing enigma in stellar pulsation theory…
Cepheid investigations using the Kepler space telescope
R. Szabó, L. Szabados, C. -C. Ngeow +35
We report results of initial work done on selected candidate Cepheids to be observed with the Kepler space telescope. Prior to the launch 40 candidates were selected from previous…