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Ba Isotope Ratio in CEMP-s and CEMP-rs Stars as a Signature of s-Process and i-Process
GalaxiesWe present a spectroscopic analysis of three carbon-enhanced metal-poor (CEMP) stars of type CEMP-s and CEMP-rs and determine their non-local thermodynamic equilibrium (NLTE) abundances of Ba and the fractions of the odd Ba isotopes (Fodd). We found Fodd
Tatyana Sitnova, Lyudmila Mashonkina
doaj +3 more sources
The i-process and CEMP-r/s stars [PDF]
, 2014 © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike Licence. We investigate whether the anomalous elemental abundance patterns in some of the C-enhanced metal-poor-r/s (CEMP-r/s) stars are ...
Pignatari, M. +22 more
core +11 more sources
Exploring the SDSS Dataset with Linked Scatter Plots: I. EMP, CEMP, and CV Stars. [PDF]
Astrophys J Suppl Ser, 2017 We present the results of a search for EMP, CEMP, and cataclysmic variable stars using a new exploration tool based on linked scatter plots (LSPs). Our approach is especially designed to work with very large spectrum data sets such as the SDSS, LAMOST ...
Carbon DF, Henze C, Nelson BC.
europepmc +2 more sources
Probing the first generations of massive stars through fluorine in CEMP-no stars
The European Physical Journal AWe investigate whether the first discovered fluorine-rich CEMP-no star, CS 29498$-$043, can be explained by a very metal-poor rotating massive star. We consider single rotating stellar models of 20 $M_{\odot}$ at a metallicity of $Z = 10^{-5}$, exploring initial rotation rates from $\upsilon_{\rm ini}/\upsilon_{\rm crit} = 0$ to $0.7$ in increments of $
Arthur Choplin, Georges Meynet
openaire +3 more sources
THE EVOLVED PULSATING CEMP STAR HD 112869 [PDF]
The Astrophysical Journal, 2015 ABSTRACT Radial velocity measurements, BVR C photometry, and high-resolution spectroscopy in the wavelength region from blue to near-infrared are employed in order to clarify the evolutionary status of the ...
Laimons Začs +6 more
openaire +2 more sources
Radial Velocity Properties of Binary CEMP-r/s Stars [PDF]
, 2021 Low metallicity stars allow us to better understand the chemical evolution of the Milky Way. A large fraction of low metallicity stars show large enhancements in carbon. These stars are known as Carbon Enhanced Metal Poor stars (CEMP stars).
Cathey, Jared Lee
core +1 more source
Clues on the first stars from CEMP-no stars [PDF]
Proceedings of the International Astronomical Union, 2015 AbstractThe material used to form the CEMP-no stars presents signatures of processing by the CNO cycle and by He-burning from a previous stellar generation called spinstars. We compare the composition of the ejecta (wind + supernova) of a spinstar model to observed abundances of CEMP-no stars.
{Choplin} A. +5 more
openaire +3 more sources
Insights on the First Stars from CEMP-no Stars [PDF]
Proceedings of the 14th International Symposium on Nuclei in the Cosmos (NIC2016), 2017 info:eu-repo/semantics ...
{Choplin} A. +5 more
openaire +4 more sources
A NEW CEMP-s RR LYRAE STAR [PDF]
The Astrophysical Journal, 2012 We show that SDSS J170733.93+585059.7 (hereafter SDSS J1707+58), previously identified by Aoki and collaborators as a carbon-enhanced metal-poor star (with s-process-element enhancements; CEMP-s), on the assumption that it is a main-sequence turn-off star, is the RR Lyrae star VIII-14 identified by the Lick Astrograph Survey.
Kinman, T. D. +3 more
openaire +2 more sources
Clues about the first stars from CEMP-no stars [PDF]
Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics, 2015 4 pages, 1 figure, sf2a ...
{Choplin} A., {Meynet} G., {Maeder} A.
openaire +3 more sources