Modelling depletion by re-accretion of gas from a dusty disc in post-AGB stars

Abstract

Many disc-type post-asymptotic giant branch (post-AGB) stars are chemically peculiar, showing underabundances of refractory elements in their photospheres that correlate with condensation temperature. The aim of this paper is to investigate how accretion from a circumbinary disc can cause this phenomenon of depletion and how this impacts the evolution of post-AGB stars. We used the \texttt{MESA} code to evolve stars in the post-AGB phase, while including accretion of metal-poor gas. We compared the models to a sample of 58 observed disc-type post-AGB stars with chemical abundance data. For each of these stars, we estimated the luminosity and the mass using the Gaia distance. We modelled the accretion rate onto the binary from a viscously evolving disc for a range of initial accretion rates and disc masses. We find that large initial accretion rates ($\gtrsim 3\times 10^{-7}$ $M_{\odot }$/yr) and large initial disc masses ($\sim 10^{-2}$ $M_{\odot }$) are needed to reproduce the observed depleted post-AGB stars. Based on these high accretion rates, the evolution timescale of post-AGB stars can be significantly extended by a factor between two and five. We distinguish depletion patterns that are unsaturated (plateau profile) from those that are saturated, and we expect that post-red giant branch (post-RGB) stars are much more likely to show an unsaturated abundance pattern compared to post-AGB stars. Finally, because of the slower evolution of the low-mass post-RGB stars, we find that these systems can become depleted at lower effective temperatures ($<5000$ K). We conclude that accretion from a circumbinary disc successfully accounts for the chemical peculiarity of post-AGB stars.

arXiv comment20 pages, 16 figures, accepted for publication in Astronomy and Astrophysics

References in corpus (58)

• The chemical composition of the Sun
• Gaia Data Release 2. Summary of the contents and survey properties
• Modules for Experiments in Stellar Astrophysics (MESA)
• Modules for Experiments in Stellar Astrophysics (MESA): Giant Planets, Oscillations, Rotation, and Massive Stars
• Modules for Experiments in Stellar Astrophysics (MESA): Binaries, Pulsations, and Explosions
• Modules for Experiments in Stellar Astrophysics (MESA): Convective Boundaries, Element Diffusion, and Massive Star Explosions
• Gaia Data Release 2: The astrometric solution
• Estimating distances from parallaxes IV: Distances to 1.33 billion stars in Gaia Data Release 2
• Gaia Data Release 2: using Gaia parallaxes
• An Eccentric Circumbinary Accretion Disk and the Detection of Binary Massive Black Holes
• New models for the evolution of Post-Asymptotic Giant Branch stars and Central Stars of Planetary Nebulae
• Post-Asymptotic Giant Branch Evolution of Low- and Intermediate-Mass Stars. Preliminary Results
• Binary Black Hole Accretion From a Circumbinary Disk: Gas Dynamics Inside the Central Cavity
• Testing a Predictive Theoretical Model for the Mass Loss Rates of Cool Stars
• Three Dimensional MHD Simulation of Circumbinary Accretion Disks: Disk Structures and Angular Momentum Transport
• Accretion into the Central Cavity of a Circumbinary Disk
• A New Version of Reimers' law of Mass Loss Based on a Physical Approach
• Keplerian discs around post-AGB stars: a common phenomenon?
• The impact of companions on stellar evolution
• Binary stars as the key to understanding planetary nebulae
• New Asymptotic Giant Branch models for a range of metallicities
• Binary Stellar Mergers with Marginally-Bound Ejecta: Excretion Disks, Inflated Envelopes, Outflows, and their Luminous Transients
• The Correlation Between Mixing Length and Metallicity on the Giant Branch: Implications for Ages in the Gaia Era
• Orbital properties of binary post-AGB stars
• Three Dimensional MHD Simulation of Circumbinary Accretion Disks -2. Net Accretion Rate
• Optically visible post-AGB/RGB stars and young stellar objects in the Small Magellanic Cloud: candidate selection, spectral energy distributions and spectroscopic examination
• Extended rotating disks around post-AGB stars
• Properties of the close binary and circumbinary torus of the Red Rectangle
• Optically Visible Post-AGB Stars, Post-RGB Stars and Young Stellar Objects in the Large Magellanic Cloud
• The WISE View of RV Tauri Stars
• Abundance Analyses of Field RV Tauri Stars, VI: An Extended Sample
• A newly discovered stellar type: dusty post-red giant branch stars in the Magellanic Clouds
• Abundance Analyses of Field RV Stars, V: DS Aquarii, UY Arae, TW Camelopardis, BT Librae, U Moncerotis, TT Ophiuchi, and RV Tauri
• Evolution of planetary nebulae II. Population effects on the bright cut-off of the PNLF
• A critical test of empirical mass loss formulae applied to individual giants and supergiants
• Depletion in post-AGB stars with a dusty disc. II
• Modelling Kepler Red Giants in Eclipsing Binaries:Calibrating the Mixing Length Parameter with Asteroseismology
• Imaging the dust sublimation front of a circumbinary disk
• Establishing binarity amongst Galactic RV Tauri stars with a disc
• Detailed homogeneous abundance studies of 14 Galactic s-process enriched post-AGB stars: In search of lead (Pb)
• The Chemical Compositions of the Type II Cepheids -- The BL Her and W Vir Variables
• On the Eccentricity Excitation in Post-Main Sequence Binaries
• A mid-IR interferometric survey with MIDI/VLTI: resolving the second-generation protoplanetary disks around post-AGB binaries
• Time resolved spectroscopy of BD+46 442: gas streams and jet creation in a newly discovered evolved binary with a disk
• The mysterious cut-off of the Planetary Nebula Luminosity Function
• First detection of surface magnetic fields in Post-AGB stars : the cases of U Monocerotis and R Scuti
• IRAS 08544-4431 : a new post-AGB star in a binary system surrounded by a dusty disc
• The evolved circumbinary disk of AC Her: a radiative transfer, interferometric and mineralogical study
• Jet creation in post-AGB binaries: the circum-companion accretion disc around BD+46${}^{\circ }$442
• An interferometric study of the post-AGB binary 89 Herculis. II Radiative transfer models of the circumbinary disk
• The perturbed sublimation rim of the dust disk around the post-AGB binary IRAS08544-4431
• Generalized Similarity for Accretion/Decretion Disks
• A Spectroscopic and Photometric Study of the Metal-Poor, Pulsating, Post-AGB Binary HD 46703
• The spectroscopic binaries RV Tauri and DF Cygni
• IRAS\,11472-0800: an extremely depleted pulsating binary post-AGB star
• Post-AGB discs from common-envelope evolution
• The Belgian repository of fundamental atomic data and stellar spectra (BRASS) II. Quality assessment of atomic data for unblended lines in FGK stars
• GK Car and GZ Nor: Two low-luminous, depleted RV Tauri stars

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