Results 1 to 10 of about 188,182 (340)
Reevaluating Old Stellar Populations [PDF]
Monthly Notices of the Royal Astronomical Society, 2018 Determining the properties of old stellar populations (those with age >1 Gyr) has long involved the comparison of their integrated light, either in the form of photometry or spectroscopic indexes, with empirical or synthetic templates. Here we reevaluate the properties of old stellar populations using a new set of stellar population synthesis models ...
John J. Eldridge, Elizabeth R. Stanway
arxiv +5 more sources
Do Red Galaxies Form More Stars than Blue Galaxies? [PDF]
The Astrophysical JournalA new model is proposed in which typical galaxies form most of their stellar mass in a phase with an intrinsically red stellar population. In the standard picture, galaxies with intrinsically red stellar populations are believed to have old stellar ...
Charles L. Steinhardt
doaj +2 more sources
Stellar Population Properties in the Stellar Streams around SPRC047
The Astrophysical JournalWe have investigated the properties (e.g., age, metallicity) of the stellar populations of a ringlike tidal stellar stream (or streams) around the edge-on galaxy SPRC047 ( z = 0.031) using spectral energy distribution (SED) fits to ...
Seppo Laine +7 more
doaj +4 more sources
Planetary Nebulae and the Ionization of the Interstellar Medium in Galaxies
Frontiers in Astronomy and Space Sciences, 2022 We discuss the role of planetary nebulae and their progeny in galaxy context in terms of ionization of the galaxy interstellar medium. This regards ionized gas outside the disk of spiral galaxies, the diffuse ionized medium in spiral galaxies, and the ...
Grażyna Stasińska +2 more
doaj +1 more source
The C/M Ratio of AGB Stars in the Local Group Galaxies
Universe, 2022 The number ratio of carbon-rich to oxygen-rich asymptotic giant branch (AGB) stars (the so-called C/M ratio) is closely related to the evolution environment of the host galaxy.
Tongtian Ren +3 more
doaj +1 more source
Galaxies, 2020 Luminous Blue Variables are massive evolved stars, here we introduce this outstanding class of objects. Described are the specific characteristics, the evolutionary state and what they are connected to other phases and types of massive stars. Our current
Kerstin Weis, Dominik J. Bomans
doaj +1 more source
Stellar populations with ELTs [PDF]
Proceedings of the International Astronomical Union, 2005 The star formation, mass assembly and chemical enrichment histories of galaxies, and their present distributions of dark matter, remain encoded in their stellar populations. Distinguishing the actual distribution functions of stellar age, metallicity and kinematics at several locations in a range of galaxies, sampling across Hubble types and ...
Gerard Gilmore, Rosemary F. G. Wyse
openaire +4 more sources
A Hierarchical Bayesian Framework for Inferring the Stellar Obliquity Distribution
The Astronomical Journal, 2023 Stellar obliquity, the angle between a planet’s orbital axis and its host star’s spin axis, traces the formation and evolution of a planetary system. In transiting-exoplanet observations, only the sky-projected stellar obliquity can be measured, but this
Jiayin Dong, Daniel Foreman-Mackey
doaj +1 more source
The Astrophysical Journal, 2023 We investigate the mass–metallicity relationship of star-forming galaxies by analyzing the absorption line spectra of ∼200,000 galaxies in the Sloan Digital Sky Survey.
Eva Sextl +3 more
doaj +1 more source
A Study of Primordial Very Massive Star Evolution
The Astrophysical Journal, 2023 We present new evolutionary models of primordial very massive stars with initial masses ranging from 100 to 1000 M _⊙ that extend from the main sequence to the onset of dynamical instability caused by the creation of electron–positron pairs during core C,
Guglielmo Volpato +5 more
doaj +1 more source