Finest light curve details, physical parameters, and period fluctuations of CoRoT RR Lyrae stars

Abstract

The CoRoT satellite supplied the scientific community with a huge data base of variable stars. Among them the RR Lyrae stars have intensively been discussed in numerous papers in the last few years, but the latest runs have not been checked to find RR Lyrae stars up to now. Our main goal was to fill this gap and complete the CoRoT RR Lyrae sample. We found nine unstudied RR Lyrae stars. Seven of them are new discoveries. We identified three new Blazhko stars. The Blazhko effect shows non-strictly repetitive nature for all stars. The frequency spectrum of the Blazhko star CoRoT 104948132 contains second overtone frequency with the highest known period ratio. The harmonic amplitude and phase declines with the harmonic order were studied for non-Blazhko stars. We found a period dependent but similar shape amplitude decline for all stars. We discovered significant random period fluctuation for one of the two oversampled target, CM Ori. After a successful transformation of the CoRoT band parameters to the Johnson V values we estimated the basic physical properties such as mass, luminosity, metallicity. The sample can be divided into two subgroups with respect to the metallicity but otherwise the physical parameters are in the canonical range of RR Lyrae stars.

12 pages, 11 figures, 2 tables; accepted for publication in MNRAS

References in corpus (11)

• Kepler photometry of RRc stars: peculiar double-mode pulsations and period doubling
• Stellar evolution through the ages: period variations in galactic RRab stars as derived from the GEOS database and TAROT telescopes
• Long time-scale behavior of the Blazhko effect from rectified Kepler data
• Revisiting CoRoT RR Lyrae stars: detection of period doubling and temporal variation of additional frequencies
• RR Lyrae stars in Galactic globular clusters. VI. The Period-Amplitude relation
• The shortest modulation period Blazhko RR Lyrae star: SS Cnc
• CoRoT Data Reduction By Example
• Characteristics of bright ab-type RR Lyrae stars from the ASAS and WASP surveys
• Radial Stellar Pulsation and Three-Dimensional Convection. IV. Full Amplitude Three-Dimensional Solutions
• Fundamental parameters of RR Lyrae stars from multicolour photometry and Kurucz atmospheric models -- III. SW And, DH Peg, CU Com, DY Peg
• Fundamental parameters of RR Lyrae stars from multicolour photometry and Kurucz atmospheric models. I. Theory and practical implementation

Cited by in corpus (11)

• TESS observations of Cepheid stars: first light results
• First results on RR Lyrae stars with the TESS space telescope: untangling the connections between mode content, colors and distances
• Blazhko effect in the Galactic bulge fundamental mode RR~Lyrae stars I: Incidence rate and differences between modulated and non-modulated stars
• Revisiting the Kepler non-Blazhko RR Lyrae sample: Cycle-to-cyle variations and additional modes
• Time series analysis of bright TESS RRc stars: Additional modes, phase variations and more
• On the connection between almost periodic functions and Blazhko light curves
• Detection of Gravity Modes in RR Lyrae Stars
• Type II and anomalous Cepheids in the Kepler K2 mission
• Connections between the cycle-to-cycle light curve and O-C variations of the non-Blazhko RR Lyrae stars
• Harmonics as a Hidden Window into the Turbulent Convective Envelope of non-Blazhko RRab Stars
• Pushing the Limit of Asteroseismic Detection for Cool Dwarfs using TESS and Deep Learning