Results 1 to 10 of about 165,756 (136)

Planetary Nebulae and the Ionization of the Interstellar Medium in Galaxies

open access: yesFrontiers 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

open access: yesUniverse, 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

Luminous Blue Variables

open access: yesGalaxies, 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

A Hierarchical Bayesian Framework for Inferring the Stellar Obliquity Distribution

open access: yesThe 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

Mass–Metallicity Relationship of SDSS Star-forming Galaxies: Population Synthesis Analysis and Effects of Star Burst Length, Extinction Law, Initial Mass Function, and Star Formation Rate

open access: yesThe 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

open access: yesThe 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

LATIS: The Stellar Mass–Metallicity Relation of Star-forming Galaxies at z ∼ 2.5

open access: yesThe Astrophysical Journal, 2023
We present the stellar mass–stellar metallicity relation for 3491 star-forming galaxies at 2 ≲ z ≲ 3 using rest-frame far-ultraviolet spectra from the Ly α Tomography IMACS Survey (LATIS).
Nima Chartab   +4 more
doaj   +1 more source

The TYPHOON Stellar Population Synthesis Survey. I. The Young Stellar Population of the Great Barred Spiral NGC 1365

open access: yesThe Astrophysical Journal, 2023
We analyze TYPHOON long-slit-absorption line spectra of the starburst barred spiral galaxy NGC 1365 obtained with the Progressive Integral Step Method covering an area of 15 kpc ^2 .
Eva Sextl   +8 more
doaj   +1 more source

Distribution and Evolution of Metals in the Magneticum Simulations

open access: yesGalaxies, 2017
Metals are ideal tracers of the baryonic cycle within halos. Their composition is a fossil record connecting the evolution of the various stellar components of galaxies to the interaction with the environment by in- and out-flows.
Klaus Dolag   +2 more
doaj   +1 more source

Unresolved versus resolved: testing the validity of young simple stellar population models with VLT/MUSE observations of NGC 3603 [PDF]

open access: yes, 2016
CONTEXT. Stellar populations are the building blocks of galaxies including the Milky Way. The majority, if not all extragalactic studies are entangled with the use of stellar population models given the unresolved nature of their observation ...
Anderson, J. P.   +4 more
core   +1 more source

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