Results 1 to 10 of about 18,407 (265)

The influence of metallicity on helium and CO core masses in massive stars [PDF]

Serbian Astronomical Journal, 2023
We present the results of 58 detailed evolutionary models of massive single stars and close binary systems with the Solar and Small Magellanic Cloud (SMC) metallicity computed with the MESA (Modules for Experiments in Stellar Astrophysics ...
Petrović Jelena
doaj   +1 more source

The Initial-Final Mass Relation of White Dwarfs: A Tool to Calibrate the Third Dredge-Up

Universe, 2022
The initial mass-final mass relationship (IFMR) of white dwarfs (WD) represents a crucial benchmark for stellar evolution models, especially for the efficiency of mixing episodes and mass loss during the asymptotic giant branch (AGB) phase. In this study,
Paola Marigo
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Dust Production around Carbon-Rich Stars: The Role of Metallicity

Universe, 2021
Background: Most of the stars in the Universe will end their evolution by losing their envelope during the thermally pulsing asymptotic giant branch (TP-AGB) phase, enriching the interstellar medium of galaxies with heavy elements, partially condensed ...
Ambra Nanni, Sergio Cristallo, Jacco Th. van Loon, Martin A. T. Groenewegen   +3 more
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Carbon Abundance of Globular Cluster M22 (NGC 6656) and the Surface Carbon Depletion Rates of the Milky Way Globular Clusters

The Astrophysical Journal Letters, 2023
It is well known that metal-poor red giant branch (RGB) stars show variations in some elemental abundances, including carbon, due to the internal mixing accompanied by their own in situ CN cycle in the hydrogen burning shell.
Jae-Woo Lee
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Chemodynamically Tagged Groups of CEMP Stars in the Halo of the Milky Way. I. Untangling the Origins of CEMP-s and CEMP-no Stars

The Astrophysical Journal, 2023
We construct a sample of 644 carbon-enhanced metal-poor (CEMP) stars with abundance analyses based on moderate- to high-resolution spectroscopic studies.
Joseph Zepeda, Timothy C. Beers, Vinicius M. Placco, Derek Shank, Dmitrii Gudin, Yutaka Hirai, Mohammad Mardini, Colin Pifer, Thomas Catapano, Sean Calagna   +9 more
doaj   +1 more source

Chemical Tracing and the Origin of Carbon in the Galactic Disk

Universe, 2022
A basic problem in studies of the evolution of chemical elements in galaxies is the uncertainties in the yields of elements produced by different types of stars.
Bengt Gustafsson
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Evidence of First Stars-enriched Gas in High-redshift Absorbers

The Astrophysical Journal, 2023
The first stars were born from chemically pristine gas. They were likely massive, and thus they rapidly exploded as supernovae, enriching the surrounding gas with the first heavy elements.
Andrea Saccardi, Stefania Salvadori, Valentina D’Odorico, Guido Cupani, Michele Fumagalli, Trystyn A. M. Berg, George D. Becker, Sara Ellison, Sebastian Lopez   +8 more
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Model Dust Envelopes Around Silicate Carbon Stars [PDF]

Journal of Astronomy and Space Sciences, 2006
We have modeled dust envelopes around silicate carbon stars using optical properties for a mixture of amorphous carbon and silicate dust grains paying close attention to the infrared observations of the stars.
Kyung-Won Suh
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DISTRIBUTION OF CARBON STARS IN THE GALAXY

Odessa Astronomical Publications, 2018
A search for new faint carbon (C) stars in the Polar region δ > 55o has been accomplished by obtaining objective prism spectra in the near infrared 550 -- 900 nm on images of CCD camera of Baldone Schmidt telescope of Astrophysical observatory.
I. Eglitis, A. Sokolova
doaj   +1 more source

The Initial-Final Mass Relation from Carbon Stars in Open Clusters

Galaxies
Recently, Marigo et al, identified a kink in the initial-final mass relation around initial masses of Mini≈1.65−2.10M⊙, based on Gaia DR2 and EDR3 data for white dwarfs in open clusters aged 1.5–2.5 Gyr.
Carlos Abia, Inma Domínguez, Paola Marigo, Sergio Cristallo, Oscar Straniero   +4 more
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