Discovery of the second SiO maser in a “water fountain” star — one with outflows exceeding 100 km/s as traced by water masers — promises to determine the evolutionary stage of these rare stars.
Modeling of dwarf spheroidal galaxies in the Local Group shows how the star formation history and chemical evolution of a galaxy can be constrained with measurements of chemical abundance ratios.
Janice C. Lee et al 2022 ApJS 258 10
A new survey that will combine data from several premier observatories seeks to understand how stars form from the interstellar medium in nearby galaxies, potentially answering a key question in astrophysics.
Evolved stars exiting the asymptotic giant branch sometimes live briefly once more when they experience a final helium shell flash — a process that may explain the presence of some hydrogen-deficient stars.
Variations in the strengths of emission lines from metal species in the atmosphere of a B-type main-sequence star suggest that the radial component of this star’s magnetic field decreases with increasing altitude.
General-relativistic magnetohydrodynamic simulations show how plasmoids — coherent packets of plasma and magnetic fields — mediate the reconfiguration of magnetic fields around an accreting black hole.