BriteStars2024
Published October 14, 2024 | Version v1
Poster Open

The Apparent Non-Variable Stars from the Kepler Mission

Authors/Creators

  • 1. Department of Theoretical Physics and Astrophysics, Masaryk University, Brno, Czechia

Description

The analysis of non-variable stars are mostly neglected in the literature. However such objects are not only needed for many calibration purposes, but also for testing pulsational models, for example. The photometric time-series of the Kepler satellite mission are still the most accurate available and excellently suited to search for non-variable stars. We analysed all Long Cadence light curves for stars not reported as variable so far from the Kepler satellite mission. Using the known characteristics and flaws of these data sets, we defined three different frequency ranges in which we searched for nonvariability. We used the Lomb-Scargle periodogram and the False-Alarm probability (FAP) to analyse the cleaned data sets of 138 451 light curves. We then used log FAP ≥ −2 for defining a star not being variable in the ranges of below 0.1 c/d, 0.1 to 2.0 c/d, and 2.0 to 25.0 c/d, respectively. Furthermore, we also calculated the standard deviation of the mean light curve to provide another parameter. In total, we found 14 154 stars which fulfil the set criteria. These objects are mainly cooler than 7000K populating the whole Main Sequence to the Red Giant Branch.

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Additional details

Related works

Is described by
Publication: 10.1051/0004-6361/202244572 (DOI)

References

  • Paunzen, E., et al., 2024, A&A, 687, A208