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The Common Envelope Evolution Outcome. III. the Improvement of Stellar Binding Energy with the Envelope Residual
Lifu Zhang, Hongwei Ge, Dylan Hebrail +7
Common-envelope evolution (CEE) is a key process in the evolution of close binary systems. Many important astrophysical objects and evolutionary stages are closely related to CEE,…
Influence of tidal dissipation on outcomes of binary-single encounters between stars and black holes in stellar clusters
Lucas Hellström, Abbas Askar, Alessandro A. Trani +3
In the cores of dense stellar clusters, close gravitational encounters between binary and single stars can frequently occur. Using the Tsunami code, we computed the outcome of a la…
The GALAH survey: Multiple stars and our Galaxy. I. A comprehensive method for deriving properties of FGK binary stars
G. Traven, S. Feltzing, T. Merle +24
Binary stellar systems form a large fraction of the Galaxy's stars. They are useful as laboratories for studying the physical processes taking place within stars, and must be corre…
Super-Earth ingestion can explain the anomalously high metal abundances of M67 Y2235
Ross P. Church, Alexander J. Mustill, Fan Liu
We investigate the hypothesis that ingestion of a terrestrial or super-Earth planet could cause the anomalously high metal abundances seen in a turn-off star in the open cluster M6…
Benchmark ages for the Gaia benchmark stars
Christian L. Sahlholdt, Sofia Feltzing, Lennart Lindegren +1
In the era of large-scale surveys of stars in the Milky Way, stellar ages are crucial for studying the evolution of the Galaxy. But determining ages of field stars is notoriously d…
Thermohaline mixing in extremely metal-poor stars
Kate Henkel, Amanda I. Karakas, Andrew R. Casey +2
Extremely metal-poor (EMP) stars are an integral piece in the puzzle that is the early Universe, and although anomolous subclasses of EMP stars such as carbon-enhanced metal-poor (…
Gaia DR2 confirms that candidate Thorne-Żytkow object HV 2112 is in the SMC
Paul J. McMillan, Ross P. Church
The Gaia DR2 proper motion places HV 2112 in the Small Magellanic Cloud (SMC), consistent with it being a Thorne-Żytkow object.
Stellar multiplicity in high-resolution spectroscopic surveys. I. Application to APOGEE subgiants and giants
Edita Stonkutė, Ross P. Church, Sofia Feltzing +1
Many field stars reside in binaries, and the analysis and interpretation of photometric and spectroscopic surveys must take this into account. We have developed a model to predict…
Estimating stellar ages and metallicities from parallaxes and broadband photometry - successes and shortcomings
Louise M. Howes, Lennart Lindegren, Sofia Feltzing +2
A deep understanding of the Milky Way galaxy, its formation and evolution requires observations of huge numbers of stars. Stellar photometry, therefore, provides an economical meth…
Stellar multiplicity in the Milky Way Galaxy
Edita Stonkute, Ross P. Church, Sofia Feltzing +1
We present our models of the effect of binaries on high-resolution spectroscopic surveys. We want to determine how many binary stars will be observed, whether unresolved binaries w…
Diagnostics of Stellar Modelling from Spectroscopy and Photometry of Globular Clusters
George Angelou, Valentina D'Orazi, Thomas Constantino +3
We conduct a series of comparisons between spectroscopic and photometric observations of globular clusters and stellar models to examine their predictive power. Data from medium-to…
On the Numerical Treatment and Dependence of Thermohaline Mixing in Red Giants
John Lattanzio, Lionel Siess, Ross Church +5
In recent years much interest has been shown in the process of thermohaline mixing in red giants. In low and intermediate mass stars this mechanism first activates at the position…
The Role of Thermohaline Mixing in Intermediate- and Low-Metallicity Globular Clusters
George C. Angelou, Richard J. Stancliffe, Ross P. Church +2
It is now widely accepted that globular cluster red giant branch stars owe their strange abundance patterns to a combination of pollution from progenitor stars and in situ extra mi…
Coordinates and 2MASS and OGLE identifications for all stars in Arp's 1965 finding chart for Baade's Window
Ross P. Church, Jennifer A. Johnson, Sofia Feltzing
Aims: We seek to provide 2MASS and OGLE identifications and coordinates for all stars in the finding chart published by Arp\,(1965). This chart covers the low extinction area aroun…
Thermohaline Mixing and its Role in the Evolution of Carbon and Nitrogen Abundances in Globular Cluster Red Giants: The Test Case of Messier 3
George C. Angelou, Ross P. Church, Richard J. Stancliffe +2
We review the observational evidence for extra mixing in stars on the red giant branch (RGB) and discuss why thermohaline mixing is a strong candidate mechanism. We recall the simp…
White-Dwarf Kicks and Implications for Barium Stars
Robert G. Izzard, Tyl Dermine, Ross P. Church
The formation mechanism of the barium stars is thought to be well understood. Barium-rich material, lost in a stellar wind from a thermally-pulsing asymptotic-giant branch star in…
Observational Constraints for Thermohaline Mixing
G. C. Angelou, J. C. Lattanzio, R. P. Church +1
We provide a brief review of thermohaline physics and why it is a candidate extra mixing mechanism during the red giant branch (RGB). We discuss how thermohaline mixing (also calle…
MONTAGE: AGB nucleosynthesis with full s-process calculations
R. P. Church, S. Cristallo, J. C. Lattanzio +3
We present MONTAGE, a post-processing nucleosynthesis code that combines a traditional network for isotopes lighter than calcium with a rapid algorithm for calculating the s-proces…
The depletion of carbon by extra mixing in metal-poor giants
Richard J. Stancliffe, Ross P. Church, George C. Angelou +1
There is an apparent dichotomy between the metal-poor ([Fe/H] <= -2) yet carbon-normal giants and their carbon-rich counterparts. The former undergo significant depletion of carbon…
Mass transfer in eccentric binaries: the new Oil-on-Water SPH technique
Ross P. Church, Johann Dischler, Melvyn B. Davies +3
To measure the onset of mass transfer in eccentric binaries we have developed a two-phase SPH technique. Mass transfer is important in the evolution of close binaries, and a key is…
N-body Simulations with Live Stellar Evolution
Ross P. Church, Christopher A. Tout, Jarrod R. Hurley
An N-body code containing live stellar evolution through combination of the software packages NBODY6 and STARS is presented. Operational details of the two codes are outlined and t…
Why do low-mass stars become red giants?
Richard J. Stancliffe, Alessandro Chieffi, John C. Lattanzio +1
We revisit the problem of why stars become red giants. We modify the physics of a standard stellar evolution code in order to determine what does and what does not contribute to a…