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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…
Formation constraints indicate a black-hole accretor in 47 Tuc X9
Ross P. Church, Jay Strader, Melvyn B. Davies +1
The luminous X-ray binary 47 Tuc X9 shows radio and X-ray emission consistent with a stellar-mass black hole accreting from a carbon-oxygen white dwarf. Its location, in the core o…