Physical properties of galactic RV Tauri stars from Gaia DR2 data

Abstract

We present the first period-luminosity and period-radius relation of Galactic RV Tauri variable stars. We have surveyed the literature for all variable stars belonging to this class and compiled the full set of their photometric and spectroscopic measurements. We cross-matched the final list of stars with the Gaia DR2 database and took the parallaxes, G-band magnitudes and effective temperatures to calculate the distances, luminosities and radii using a probabilistic approach. As it turned out, the sample was very contaminated and thus we restricted our study to those objects for which the RV Tau-nature was securely confirmed. We found that several stars are located outside the red edge of the classical instability strip, which implies a wider pulsational region for RV Tau stars. The period-luminosity relation of galactic RV Tauri stars is steeper than that of the shorter-period Type II Cepheids, in agreement with previous result obtained for the Magellanic Clouds and globular clusters. The median masses of RVa and RVb stars were calculated to be 0.45-0.52 M${}_{\odot }$ and 0.83 M${}_{\odot }$, respectively.

10 pages, accepted to ApJ

References in corpus (10)

• The Gaia mission
• Asteroseismology and Gaia: Testing Scaling Relations Using 2200 Kepler Stars with TGAS Parallaxes
• Estimating distances from parallaxes. II. Performance of Bayesian distance estimators on a Gaia-like catalogue
• Optically visible post-AGB/RGB stars and young stellar objects in the Small Magellanic Cloud: candidate selection, spectral energy distributions and spectroscopic examination
• The period-luminosity relation for type II Cepheids in globular clusters
• Establishing binarity amongst Galactic RV Tauri stars with a disc
• Defining the instability strip of pulsating post-AGB binary stars from ASAS and NSVS photometry
• The period-luminosity and period-radius relations of Type II and anomalous Cepheids
• Amplitude variations of modulated RV Tauri stars support the dust obscuration model of the RVb phenomenon
• Periodicities of the RV Tau-type pulsating star DF Cygni: a combination of Kepler data with ground-based observations

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• Three-dimensional orbit of AC Her determined: Binary-induced truncation cannot explain the large cavity in this post-AGB transition disk
• Multiwavelength Observations of the RV Tauri Variable System U Monocerotis: Long-Term Variability Phenomena That Can Be Explained by Binary Interactions with a Circumbinary Disk
• New theoretical predictions on Type II Cepheids: towards a self consistent Pop. II distance scale
• SPHERE/ZIMPOL insights into discs around evolved stars: arcs, asymmetries and dust properties
• Spectroscopy of a sample of RV Tauri stars without IR excess
• Variable Stars in M31 Stellar Clusters from the Panchromatic Hubble Andromeda Treasury