Monitoring Period Variations of Variable Stars using Precise Photometric Surveys

0521629 - ASÚ 2020 RIV GB eng C - Conference Paper (international conference)
Mikulášek, Z. - Zejda, M. - Hümmerich, S. - Krtička, J. - Bernhard, K. - Paunzen, E. - Skarka, Marek - de Villiers, S. - Jagelka, M. - Bakiș, V.
Monitoring Period Variations of Variable Stars using Precise Photometric Surveys.
Southern Horizons in Time-Domain Astronomy. Cambridge: Cambridge University Press, 2019, s. 310-313. Proceedings of the International Astronomical Union, IAU S339. ISBN 9781107192638. ISSN 1743-9213. E-ISSN 1743-9221.
[Symposium of the International Astronomical Union /339./. Cape Town (ZA), 13.11.2017-17.11.2017]
R&D Projects: GA ČR(CZ) GC17-01752J
Institutional support: RVO:67985815
Keywords : statistical methods * surveys * stars
OECD category: Astronomy (including astrophysics,space science)

This artical described a universal method for de-trending and re-scalingprecise photometric data (Kepler, MOST, CoRoT, OGLE, ...) appropriate for period-changediagnostics of periodic variables. We demonstrated the potential of the method by analysing theperiod variability of one of the newly-identifiedKeplermagnetic chemically-peculiar (mCP)stars. We showed that, surprisingly, our target star displays near-sinusoidal changes in itsobserved light-variations, with a period of 2.85(6) years, which is apparently the result of thepresence of a nearby stellar companion. The expected long-term changes of the rotational period,as have been observed in several mCP stars, have not been identified among the sample ofKeplermCP stars.
Permanent Link: http://hdl.handle.net/11104/0306225