Results 1 to 10 of about 2,377,840 (304)
The chemical composition of carbon stars. The R-type stars [PDF]
Astronomy and Astrophysics, 2009 The aim of this work is to shed some light on the problem of the formation of carbon stars of R-type from a detailed study of their chemical composition. We use high-resolution and high signal-to-noise optical spectra of 23 R-type stars selected from the Hipparcos catalogue. The chemical analysis is made using spectral synthesis in LTE and state-of-the-
Sérgio Cristallo +2 more
exaly +3 more sources
Model Dust Envelopes for Asymptotic Giant Branch Stars. Carbon Stars. II. Carbon Stars [PDF]
Journal of Astronomy and Space Sciences, 1995 We have modeled the dust envelopes around carbon stars with close attention to the evolution of the structure of the dust shells. We use various dust density distributions to take account the effect of the superwind due to the helium shell flash by ...
Kyung-Won Suh, Hee-Joung Kwoun
doaj +1 more source
The carbon stars adventure [PDF]
Proceedings of the International Astronomical Union, 2015 info:eu-repo/semantics ...
Rau, Gioia +6 more
openaire +4 more sources
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
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 +3 more
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
doaj +1 more source
CARBON NEUTRON STAR ATMOSPHERES [PDF]
The Astrophysical Journal Supplement Series, 2013 The accuracy of measuring the basic parameters of neutron stars is limited in particular by uncertainties in chemical composition of their atmospheres. For example, atmospheres of thermally - emitting neutron stars in supernova remnants might have exotic chemical compositions, and for one of them, the neutron star in CasA, a pure carbon atmosphere has ...
Suleimanov V. +3 more
openaire +5 more sources
A Catalogue of carbon stars in the LMC [PDF]
Astronomy & Astrophysics, 2001 A catalogue of 7760 carbon stars in the Large Magellenic Cloud is presented. The stars were identified during a systematic survey of objective-prism plates taken with the UK 1.2 m Schmidt Telescope. The catalogue is compared with other lists of carbon stars and the distribution of the carbon stars is discussed.
Kontizas, E. +3 more
openaire +2 more sources
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
doaj +1 more source
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 +9 more
doaj +1 more source