All-sky RR Lyrae Stars in the Gaia Data
Lorenzo Rimoldini, Laurent Eyer, Nami Mowlavi, Dafydd W. Evans,, Krzysztof Nienartowicz, Berry Holl, Marc Audard, Leanne P. Guy, Gr\'egory, Jevardat de Fombelle, Isabelle Lecoeur-Ta\"ibi, Olivier Marchal, Gisella, Clementini, Vincenzo Ripepi, Alessia Garofalo, Roberto Molinaro
TL;DR
This paper discusses the creation of a full-sky map of RR Lyrae stars using Gaia's second data release, addressing challenges in identifying these variables with limited observations and outlining future improvements.
Contribution
It provides the first comprehensive all-sky map of RR Lyrae stars from Gaia data and analyzes the limitations of current detection methods with sparse sampling.
Findings
Identification challenges with fewer than 20 transits
Limitations in Fourier decomposition for sparse data
Prospects for improved detection in future Gaia releases
Abstract
The second Gaia data release is expected to contain data products from about 22 months of observation. Based on these data, we aim to provide an advance publication of a full-sky Gaia map of RR Lyrae stars. Although comprehensive, these data still contain a significant fraction of sources which are insufficiently sampled for Fourier series decomposition of the periodic light variations. The challenges in the identification of RR Lyrae candidates with (much) fewer than 20 field-of-view transits are described. General considerations of the results, their limitations, and interpretation are presented together with prospects for improvement in subsequent Gaia data releases.
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Taxonomy
TopicsStellar, planetary, and galactic studies · Astro and Planetary Science · Astronomy and Astrophysical Research