The WISE View of RV Tauri Stars
I. Gezer, H. Van Winckel, Z. Bozkurt, K. De Smedt, D. Kamath, M., Hillen, R. Manick

TL;DR
This study uses WISE infrared data to analyze Galactic RV Tauri stars, revealing their diverse IR properties, correlations with binarity, and insights into disc evolution and chemical depletion in post-AGB evolution.
Contribution
It extends previous IR studies of RV Tauri stars by utilizing WISE data to classify their IR properties and link them with binarity and chemical anomalies.
Findings
Disc sources are strongly correlated with binarity.
RV Tauri stars with variable mean magnitude are only found among disc sources.
Disc presence is necessary but not sufficient for chemical depletion.
Abstract
We present a detailed study based on infrared photometry of all Galactic RV Tauri stars from the General Catalogue of Variable Stars (GCVS). RV Tauri stars are the brightest among the population II Cepheids. They are thought to evolve away from the asymptotic giant branch (AGB) towards the white dwarf domain. IRAS detected several RV Tauri stars because of their large IR excesses and it was found that they occupy a specific region in the [12] - [25], [25] - [60] IRAS two-colour diagram. We used the all sky survey of WISE to extend these studies and compare the infrared properties of all RV Tauri stars in the GCVS with a selected sample of post-AGB objects with the goal to place the RV Tauri pulsators in the context of post-AGB evolution. Moreover, we correlated the IR properties of both the RV Tauri stars and the comparison sample with other observables like binarity and the presence of…
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