Kepler Pixel Project: Background RR Lyrae Stars in the Primary Kepler Mission Field of View

In this paper, we describe a project we initiated to investigate individual pixels in downloaded Kepler apertures in order to find objects in the background of the main targets with variable brightness. In the first paper of this series, we discovered and investigated 547 short-period eclipsing bina...

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Bibliographic Details
Published in:The Astrophysical journal. Supplement series 2022-05, Vol.260 (1), p.20
Main Authors: Forró, Adrienn, Szabó, Róbert, Bódi, Attila, Császár, Kornél
Format: Article
Language:English
Subjects:
Double-mode variable stars
Field of view
Horizontal branch stars
Light curve
Light curves
Photometry
Pixels
Pulsating variable stars
Pulsation modes
RR Lyrae variable stars
Space telescopes
Stellar photometry
Stellar pulsations
Time domain astronomy
Time series analysis
Variable stars
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Summary:In this paper, we describe a project we initiated to investigate individual pixels in downloaded Kepler apertures in order to find objects in the background of the main targets with variable brightness. In the first paper of this series, we discovered and investigated 547 short-period eclipsing binaries. Here we present the independent discovery of 26 new RR Lyrae stars in the Kepler background pixels obtained during the primary mission and provide continuous and precise photometry for these objects. Twenty-one of these stars were already noted by the Gaia or the Pan-STARRS survey. This new population of dominantly faint and distant RR Lyrae stars increases by 50% and complements nicely the 52 already known main target RR Lyrae stars in the original Kepler field. Despite their faintness, the four-year quasi-uninterrupted light curves of these stars allow an unprecedented view of these faint halo objects. We present an analysis of the light curves of the new RR Lyrae sample, verify their classification using Fourier parameters, and discuss the properties of these newly found pulsating variable stars. Most notably, this is the first time that such faint RR Lyrae stars have been investigated with the help of a photometric data set with outstanding cadence and precision. Interestingly, these objects share the properties of their brighter siblings in terms of subclass characteristics, additional mode content, and modulation occurrence rates.
ISSN:0067-0049
1538-4365
DOI:10.3847/1538-4365/ac5e9e