Gaia Data Release 3: The second Gaia catalogue of Long-Period Variable candidates
T. Lebzelter, N. Mowlavi, I. Lecoeur-Taibi, M. Trabucchi, M. Audard,, P. Garc\'ia-Lario, P. Gavras, B. Holl, G. Jevardat de Fombelle, K., Nienartowicz, L. Rimoldini, and L. Eyer

TL;DR
The Gaia DR3 catalogue of over 1.7 million long-period variable stars offers extensive data on their variability, periods, and carbon star classification, significantly expanding the known LPV population with high completeness and low contamination.
Contribution
This paper presents the second Gaia catalogue of LPVs, including new methods for variability analysis and C-star identification, increasing the known LPV count and improving classification accuracy.
Findings
Catalogue contains 1,720,558 LPV candidates.
80% completeness compared to literature data.
Contamination estimated below 2%.
Abstract
The third Gaia Data Release, covering 34 months of data, includes the second Gaia catalogue of long-period variables (LPVs), with G variability amplitudes larger than 0.1 mag (5-95% quantile range). The paper describes the production and content of this catalogue, and the methods used to compute the published variability parameters and identify C-star candidates. We applied various filtering criteria to minimise contamination by other kinds of variables. The variability parameters, period and amplitude, were derived from model fits to the G-band light curves, wherever possible. C stars were identified using their molecular signature in the low-resolution RP spectra. The catalogue contains 1 720 558 LPV candidates, including 392 240 stars with published periods (ranging from 35 to1000 days) and 546 468 stars classified as C-stars candidates. Comparison with literature data (OGLE and…
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Taxonomy
TopicsStellar, planetary, and galactic studies · Astronomy and Astrophysical Research
