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The impact of metallicity on nova populations
(2022-01-01)
The metallicity of a star affects its evolution in a variety of ways, changing stellar radii, luminosities, lifetimes, and remnant properties. In this work, we use the population synthesis code binary_c to study how ...
The COMBS Survey -- III. The Chemodynamical Origins of Metal-Poor Bulge Stars
(2022-01-01)
The characteristics of the stellar populations in the Galactic Bulge inform and constrain the Milky Way's formation and evolution. The metal-poor population is particularly important in light of cosmological simulations, ...
The Radioactive Nuclei 26Al and 60Fe in the Cosmos and in the Solar System
(2021-12-09)
The cosmic evolution of the chemical elements from the Big Bang to the present time is driven by nuclear fusion reactions inside stars and stellar explosions. A cycle of matter recurrently re-processes metal-enriched stellar ...
The first retrieval of a substellar subdwarf: A cloud-free SDSS J125637.13-022452.4
(2021-12-08)
We present the first retrieval analysis of a substellar subdwarf, SDSS J125637.13-022452.4 (SDSS J1256-0224), using the Brewster retrieval code base. We find SDSS J1256-0224 is best fit by a cloud-free model with an ion ...
High resolution spectroscopic follow-up of the most metal-poor candidates from SkyMapper DR1.1
(2021-11-01)
We present chemical abundances for 21 elements (from Li to Eu) in 150 metal-poor Galactic stars spanning -4.1 < [Fe/H] < -2.1. The targets were selected from the SkyMapper survey and include 90 objects with [Fe/H] ≤ -3 of ...
Variable star classification across the Galactic bulge and disc with the VISTA Variables in the Vía Láctea survey
(2021-10-30)
We present VIVACE, the VIrac VAriable Classification Ensemble, a catalogue of variable stars extracted from an automated classification pipeline for the Vista Variables in the V\'ia L\'actea (VVV) infrared survey of the ...
The JCMT Transient Survey: Four-year Summary of Monitoring the Submillimeter Variability of Protostars
(2021-10-21)
We present the four-year survey results of monthly submillimeter monitoring of eight nearby ($<500 $pc) star-forming regions by the JCMT Transient Survey. We apply the Lomb-Scargle Periodogram technique to search for and ...
A Catalog of Potential Post–Common Envelope Binaries
(2021-10-20)
We present a catalogue containing 839 candidate post common envelope systems. Common envelope evolution is very important in stellar astrophysics, particularly in the context of very compact and short-period binaries, ...
The population of M dwarfs observed at low radio frequencies
(2021-10-11)
Coherent low-frequency (≲200 MHz) radio emission from stars encodes the conditions of the outer corona, mass-ejection events and space weather 1–5. Previous low-frequency searches for radio-emitting stellar systems have ...
Barium lines in high-quality spectra of two metal-poor giants in the Galactic halo
(2021-10-01)
Context. Theoretical results showed the possibility that neutron capture elements were produced in the early Universe by two different sources: a frequent s-process source hosted by rotating massive stars, and a rare ...