On the Interpretation of the Long-Term Cyclic Period Variations in RR Lyrae Stars

0499851 - ASÚ 2019 RIV PL eng C - Konferenční příspěvek (zahraniční konf.)
Skarka, Marek - Liška, J. - Sódor, A. - Guggenberger, E. - Dřevěný, R. - Barnes, T. - Kolenberg, B.
On the Interpretation of the Long-Term Cyclic Period Variations in RR Lyrae Stars.
The RR Lyrae 2017 Conference. Revival of the Classical Pulsators: from Galactic Structure to Stellar Interior Diagnostics. Warszawa: Polskie Towarzystwo Astronomiczne, 2018 - (Smolec, R.), June (2018), s. 243-247. Proceedings of the Polish Astronomical Society, Vol. 6. ISBN 9788393827992. ISSN 2545-1022.
[The RR Lyrae 2017 Conference. Niepołomice (PL), 17.09.2017-21.09.2017]
Grant CEP: GA ČR(CZ) GC17-01752J
Institucionální podpora: RVO:67985815
Klíčová slova: RR Lyrae * LTTE hypothesis * black hole range
Obor OECD: Astronomy (including astrophysics,space science)
https://www.pta.edu.pl/pliki/proc/vol6/v6p243.pdf

Many RR Lyrae stars show long-term variations of their pulsation period, some of them in a cyclic way. Such behaviour can be attributed to the light-travel time effect (LTTE) caused by an unseen companion. Solutions of the LTTE often suggest very eccentric orbits and minimal mass of the companion on the order of several solar masses, thus, in the black hole range. We discuss the possibility of the occurrence of the RR Lyrae-black hole pairs, and on the case of Z CVn, demonstrate that the LTTE hypothesis can be false in some of the binary candidates.
Trvalý link: http://hdl.handle.net/11104/0292043