The local and distant Universe: stellar ages and H0 [PDF]
Journal of Cosmology and Astroparticle Physics, 2019 The ages of the oldest stellar objects in our galaxy provide an independent test of the current cosmological model as they give a lower limit to the age of the Universe.
R. Jimenez +4 more
semanticscholar +1 more source
The Influence of Atomic Diffusion on Stellar Ages and Chemical Tagging [PDF]
, 2017 In the era of large stellar spectroscopic surveys, there is an emphasis on deriving not only stellar abundances but also the ages for millions of stars.
A. Dotter +3 more
semanticscholar +1 more source
Stellar ages, masses, and radii from asteroseismic modeling are robust to systematic errors in spectroscopy [PDF]
Astronomy & Astrophysics, 2018 Context. The search for twins of the Sun and Earth relies on accurate characterization of stellar and the exoplanetary parameters age, mass, and radius.
E. Bellinger +4 more
semanticscholar +1 more source
Galaxy evolution across environments as probed by the ages, stellar metallicities, and [α /Fe] of central and satellite galaxies [PDF]
, 2020 We explore how the star formation and metal enrichment histories of present-day galaxies have been affected by environment combining stellar population parameter estimates and group environment characterization for SDSS DR7.
A. Gallazzi +5 more
semanticscholar +1 more source
The Abundance of S-Process Elements: Temporal and Spatial Trends from Open Cluster Observations
Universe, 2022 Spectroscopic observations of stars belonging to open clusters, with well-determined ages and distances, are a unique tool for constraining stellar evolution, nucleosynthesis, mixing processes, and, ultimately, Galactic chemical evolution.
Laura Magrini +8 more
doaj +1 more source
Estimation of Stellar Ages and Masses Using Gaussian Process Regression
Astrophysical Journal Supplement Series, 2020 Stellar ages play a crucial role in understanding the formation and evolution of stars and Galaxies, which pose many challenges while determining in practice.
Yude Bu +5 more
semanticscholar +1 more source
Living with a Red Dwarf: X-Ray, UV, and Ca ii Activity–Age Relationships of M Dwarfs
The Astrophysical Journal, 2023 The vast majority of stars in the nearby stellar neighborhood are M dwarfs. Their low masses and luminosities result in slow rates of nuclear evolution and minimal changes to the stars’ observable properties, even along astronomical timescales.
Scott G. Engle
doaj +1 more source
A method to estimate stellar ages from kinematical data [PDF]
, 2018 We present a method to build a probability density function (pdf) for the age of a star based on its peculiar velocities $U$, $V$ and $W$ and its orbital eccentricity.
F. Almeida-Fernandes, H. Rocha-Pinto
semanticscholar +1 more source
The Astronomical Journal, 2023 We report the discovery and characterization of a nearby (∼85 pc), older (27 ± 3 Myr), distributed stellar population near Lower Centaurus Crux (LCC), initially identified by searching for stars comoving with a candidate transiting planet from TESS (HD ...
Mackenna L. Wood +37 more
doaj +1 more source
Cosmological Constant from Boundary Condition and Its Implications beyond the Standard Model
Universe, 2023 Standard cosmology has long been plagued by a number of persistent problems. The origin of the apparent acceleration of the cosmic expansion remains enigmatic.
Jan O. Stenflo
doaj +1 more source