Detailed Information on Publication Record
2016
Cyclic variations in O-C diagrams of field RR Lyrae stars as a result of LiTE
LIŠKA, Jiří, Marek SKARKA, Miloslav ZEJDA, Zdeněk MIKULÁŠEK, S. N. DE VILLIERS et. al.Basic information
Original name
Cyclic variations in O-C diagrams of field RR Lyrae stars as a result of LiTE
Authors
LIŠKA, Jiří (203 Czech Republic, guarantor, belonging to the institution), Marek SKARKA (203 Czech Republic, belonging to the institution), Miloslav ZEJDA (203 Czech Republic, belonging to the institution), Zdeněk MIKULÁŠEK (203 Czech Republic, belonging to the institution) and S. N. DE VILLIERS (710 South Africa)
Edition
Monthly Notices of the Royal Astronomical Society, Priestley and Weale, 2016, 0035-8711
Other information
Language
English
Type of outcome
Článek v odborném periodiku
Field of Study
10308 Astronomy
Country of publisher
United Kingdom of Great Britain and Northern Ireland
Confidentiality degree
není předmětem státního či obchodního tajemství
References:
Impact factor
Impact factor: 4.961
RIV identification code
RIV/00216224:14310/16:00090007
Organization unit
Faculty of Science
UT WoS
000379830700072
Keywords in English
methods: data analysis; techniques: photometric; binaries: general; stars: horizontal branch; stars: variables: RR Lyrae
Změněno: 31/3/2017 10:50, Ing. Andrea Mikešková
Abstract
V originále
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.
Links
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