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@article{1345872,
author = {Liška, Jiří and Skarka, Marek and Zejda, Miloslav and Mikulášek, Zdeněk and de Villiers, S. N.},
article_number = {4},
doi = {http://dx.doi.org/10.1093/mnras/stw851},
keywords = {methods: data analysis; techniques: photometric; binaries: general; stars: horizontal branch; stars: variables: RR Lyrae},
language = {eng},
issn = {0035-8711},
journal = {Monthly Notices of the Royal Astronomical Society},
title = {Cyclic variations in O-C diagrams of field RR Lyrae stars as a result of LiTE},
url = {http://adsabs.harvard.edu/abs/2016MNRAS.459.4360L},
volume = {459},
year = {2016}
}
TY - JOUR
ID - 1345872
AU - Liška, Jiří - Skarka, Marek - Zejda, Miloslav - Mikulášek, Zdeněk - de Villiers, S. N.
PY - 2016
TI - Cyclic variations in O-C diagrams of field RR Lyrae stars as a result of LiTE
JF - Monthly Notices of the Royal Astronomical Society
VL - 459
IS - 4
SP - 4360-4377
EP - 4360-4377
PB - Priestley and Weale
SN - 00358711
KW - methods: data analysis
KW - techniques: photometric
KW - binaries: general
KW - stars: horizontal branch
KW - stars: variables: RR Lyrae
UR - http://adsabs.harvard.edu/abs/2016MNRAS.459.4360L
L2 - http://adsabs.harvard.edu/abs/2016MNRAS.459.4360L
N2 - This paper presents an extensive overview of known and proposed RR Lyrae stars in binaries. The aim is to revise and extend the list with new Galactic field systems. We utilized maxima timings for 11 RRab type stars with suspicious behaviour from the GEOS data base, and determined maxima timings from data of sky surveys and our own observations. This significantly extended the number of suitable maxima timings. We modelled the proposed Light Time Effect (LiTE) in O-C diagrams to determine orbital parameters for these systems. In contrast to recent studies, our analysis focused on decades-long periods instead of periods in the order of years. Secondary components were found to be predominantly low-mass objects. However, for RZ Cet and AT Ser the mass of the suspected companion of more than one solar mass suggests that it is a massive white dwarf, a neutron star or even a black hole. We found that the semimajor axes of the proposed orbits are between 1 and 20 au. Because the studied stars belong to the closest RR Lyraes, maximal angular distances between components during orbit should at least be between 1 and 13 mas and this improves the chance to detect both stars using current telescopes. However, our interpretation of the O-C diagrams as a consequence of the LiTE should be considered as preliminary without reliable spectroscopic measurements. On the other hand, our models give a prediction of the period and radial velocity evolution which should be sufficient for plausible proof of binarity.
ER -
LIŠKA, Jiří, Marek SKARKA, Miloslav ZEJDA, Zdeněk MIKULÁŠEK and S. N. DE VILLIERS. Cyclic variations in O-C diagrams of field RR Lyrae stars as a result of LiTE. \textit{Monthly Notices of the Royal Astronomical Society}. Priestley and Weale, 2016, vol.~459, No~4, p.~4360-4377. ISSN~0035-8711. Available from: https://dx.doi.org/10.1093/mnras/stw851.
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