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@article{1368359,
author = {Smolec, Radoslaw and Prudil, Zdeněk and Skarka, Marek and Bakowska, Karolina},
article_number = {3},
doi = {http://dx.doi.org/10.1093/mnras/stw1519},
keywords = {methods: data analysis; stars: horizontal branch; stars: oscillations; stars: variables: RR Lyrae},
language = {eng},
issn = {0035-8711},
journal = {Monthly Notices of the Royal Astronomical Society},
title = {Peculiar double-periodic pulsation in RR Lyrae stars of the OGLE collection - I. Long-period stars with dominant radial fundamental mode},
url = {http://adsabs.harvard.edu/abs/2016MNRAS.461.2934S},
volume = {461},
year = {2016}
}
TY - JOUR
ID - 1368359
AU - Smolec, Radoslaw - Prudil, Zdeněk - Skarka, Marek - Bakowska, Karolina
PY - 2016
TI - Peculiar double-periodic pulsation in RR Lyrae stars of the OGLE collection - I. Long-period stars with dominant radial fundamental mode
JF - Monthly Notices of the Royal Astronomical Society
VL - 461
IS - 3
SP - 2934-2943
EP - 2934-2943
PB - Priestley and Weale
SN - 00358711
KW - methods: data analysis
KW - stars: horizontal branch
KW - stars: oscillations
KW - stars: variables: RR Lyrae
UR - http://adsabs.harvard.edu/abs/2016MNRAS.461.2934S
L2 - http://adsabs.harvard.edu/abs/2016MNRAS.461.2934S
N2 - We present the discovery of a new, peculiar form of double-periodic pulsation in RR Lyrae stars. In four, long-period (P > 0.6 d) stars observed by the Optical Gravitational Lensing Experiment, and classified as fundamental mode pulsators (RRab), we detect additional, low-amplitude variability, with period shorter than fundamental mode period. The period ratios fall in a range similar to double-mode fundamental and first overtone RR Lyrae stars (RRd), with the exception of one star, in which the period ratio is significantly lower and nearly exactly equals 0.7. Although period ratios are fairly different for the four stars, the light-curve shapes corresponding to the dominant, fundamental mode are very similar. The peak-to-peak amplitudes and amplitude ratios (Fourier parameters R-21 and R-31) are among the highest observed in RRab stars of similar period, while Fourier phases (phi(21) and phi(31)) are among the lowest observed in RRab stars. If the additional variability is interpreted as due to radial first overtone, then, the four stars are the most extreme RRd variables of the longest pulsation periods known. Indeed, the observed period ratios can be well modelled with high-metallicity pulsation models. However, at such long pulsation periods, first overtone is typically damped. Five other candidates, with weak signature of additional variability, sharing the same characteristics, were also detected and are briefly discussed.
ER -
SMOLEC, Radoslaw, Zdeněk PRUDIL, Marek SKARKA and Karolina BAKOWSKA. Peculiar double-periodic pulsation in RR Lyrae stars of the OGLE collection - I. Long-period stars with dominant radial fundamental mode. \textit{Monthly Notices of the Royal Astronomical Society}. Priestley and Weale, 2016, vol.~461, No~3, p.~2934-2943. ISSN~0035-8711. Available from: https://dx.doi.org/10.1093/mnras/stw1519.
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