Results 11 to 20 of about 2,377,840 (304)
Witnessing the emergence of a carbon star [PDF]
Monthly Notices of the Royal Astronomical Society: Letters, 2015 Abstract During the late stages of their evolution, Sun-like stars bring the products of nuclear burning to the surface. Most of the carbon in the Universe is believed to originate from stars with masses up to a few solar masses. Although there is a chemical dichotomy between oxygen-rich and carbon-rich evolved stars, the dredge-up ...
Zijlstra, Albert; id_orcid 0000-0002-3171-5469 +12 more
openaire +5 more sources
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
doaj +1 more source
Modelling and observations of molecules in discs around young stars [PDF]
, 2013 This thesis contains a study of molecules within circumstellar discs around young stars. Firstly, the chemistry of a disc around a young, Class 0 protostar is modelled.
Ilee, John David
core +6 more sources
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 +8 more
doaj +1 more source
Are there carbon stars in the Bulge? [PDF]
Symposium - International Astronomical Union, 1999 The Bulge carbon stars have been a mystery since their discovery by Azzopardi et al. (1991), because they are about too faint to be regarded as genuine AGB stars, if located inside the metal-rich Bulge . Part of the mystery can be solved if these carbon stars are related to the Sagittarius dwarf galaxy .
openaire +2 more sources
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
doaj +1 more source
The mass-loss, expansion velocities and dust production rates of carbon stars in the Magellanic Clouds [PDF]
, 2019 The properties of carbon stars in the Magellanic Clouds (MCs) and their total dust production rates are predicted by fitting their spectral energy distributions (SED) over pre-computed grids of spectra reprocessed by dust.
Van Loon
core +1 more source
Interpretation of Carbon Stars [PDF]
Symposium - International Astronomical Union, 1974 This communication aims at presenting the results of a research, whose purposes are to gain some insight into the evolutionary state of C stars, when the assumption is made that the main features of their spectra are due to mixing of the envelope with thermonuclear processed layers.
C. Barbaro, N. Dallaporta
openaire +1 more source
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
Stabilizing carbon-lithium stars
Physical Chemistry Chemical Physics, 2011 We have explored in silico the potential energy surfaces of the C(5)Li(n)(n-6) (n = 5, 6, and 7) clusters using the Gradient Embedded Genetic Algorithm (GEGA) and other computational strategies. The most stable forms of C(5)Li(5)(-) and C(5)Li(6) are two carbon chains linked by two lithium atoms in a persistent seven membered ring capped by two Li ...
Perez-Peralta, Nancy +5 more
openaire +4 more sources