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
Stellar ages from stellar rotation [PDF]
Proceedings of the International Astronomical Union, 2008 AbstractOur ability to determine stellar ages from measurements of stellar rotation, hinges on how well we can measure the dependence of rotation on age for stars of different masses. Rotation periods for stars in open clusters are essential to determine the relations between stellar age, rotation, and mass.
openaire +2 more sources
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
Estimating stellar ages and metallicities from parallaxes and broadband photometry: successes and shortcomings [PDF]
Astronomy & Astrophysics, 2018 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 method to obtain intrinsic stellar parameters.
L. Howes +4 more
semanticscholar +1 more source
COSMOS brightest group galaxies III. Evolution of stellar ages [PDF]
Astronomy & AstrophysicsThe unique characteristics of the brightest group galaxies (BGGs) serve as a link in the evolutionary continuum between galaxies such as the Milky Way and the more massive brightest cluster galaxies found in dense clusters. This research investigates the
G. Gozaliasl +17 more
semanticscholar +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
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
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
The California-Kepler Survey. II. Precise Physical Properties of 2025 Kepler Planets and Their Host Stars [PDF]
, 2017 We present stellar and planetary properties for 1305 Kepler Objects of Interest (KOIs) hosting 2025 planet candidates observed as part of the California-Kepler Survey.
Cargile, Phillip A. +13 more
core +3 more sources
The Solar Twin Planet Search III. The [Y/Mg] clock: estimating stellar ages of solar-type stars [PDF]
, 2016 Solar twins are stars with similar stellar (surface) parameters to the Sun that can have a wide range of ages. This provide an opportunity to analyze the variation of their chemical abundances with age.
M. T. Maia +5 more
semanticscholar +1 more source