Results 11 to 20 of about 10,825 (251)
Searching for Dust around Hyper Metal-Poor Stars [PDF]
, 2014 We examine the mid-infrared fluxes and spectral energy distributions for metal-poor stars with iron abundances [Fe/H] $\lesssim-5$, as well as two CEMP-no stars, to eliminate the possibility that their low metallicities are related to the depletion of ...
Cote, Stephanie +5 more
core +4 more sources
Full Abundance Study of Two Newly Discovered Barium Giants [PDF]
The Astrophysical JournalBarium (Ba) stars are chemically peculiar stars that show enhanced surface abundances of heavy elements produced by the slow-neutron-capture process, the so-called s -process.
Sara Vitali +3 more
doaj +2 more sources
High-resolution spectroscopic analysis of four new chemically peculiar stars [PDF]
, 2022 We present detailed chemical compositions of four stars on the first-ascent red giant branch that are classified as chemically peculiar, but lack comprehensive analyses at high spectral resolution.
M. Roriz +5 more
semanticscholar +1 more source
Heavy elements in barium stars [PDF]
Monthly notices of the Royal Astronomical Society, 2021 New elemental abundances for the neutron-capture elements Sr, Nb, Mo, Ru, La, Sm, and Eu are presented for a large sample of 180 barium (Ba) giant stars, a class of chemically peculiar objects that exhibit in their spectra enhancements of the elements ...
M. Roriz +6 more
semanticscholar +1 more source
A neutron star candidate in the long-period binary 56 UMa [PDF]
Astronomy & Astrophysics, 2023 56 UMa is a wide binary system that contains a chemically peculiar red giant and a faint companion. Due to its surface chemical abundances, the red giant was classified as a barium (Ba) star. This implies that the companion has to be a white dwarf, since
A. Escorza +8 more
semanticscholar +1 more source
Jurassic: A chemically anomalous structure in the Galactic halo [PDF]
Astronomy & Astrophysics, 2020 Detailed elemental-abundance patterns of giant stars in the Galactic halo measured by the Apache Point Observatory Galactic Evolution Experiment (APOGEE-2) have revealed the existence of a unique and significant stellar subpopulation of silicon-enhanced (
J. G. Fern'andez-Trincado +2 more
semanticscholar +1 more source
Catalogue of averaged stellar effective magnetic fields - I. Chemically peculiar A and B type stars [PDF]
, 2003 This paper presents the catalogue and the method of determination of averaged quadratic effective magnetic fields $\langle B_{\rm e} \rangle$ for 596 main sequence and giant stars.
V. Bychkov +5 more
semanticscholar +1 more source
Modelling depletion by re-accretion of gas from a dusty disc in post-AGB stars [PDF]
Astronomy & Astrophysics, 2019 Many disc-type post-asymptotic giant branch (post-AGB) stars are chemically peculiar, showing underabundances of refractory elements in their photospheres that correlate with condensation temperature. The aim of this paper is to investigate how accretion
Glenn-Michael Oomen +3 more
semanticscholar +1 more source
The eccentric behaviour of windy binary stars [PDF]
Astronomy & Astrophysics, 2019 Carbon-enhanced metal-poor stars, CH stars, barium stars, and extrinsic S stars, among other classes of chemically peculiar stars, are thought to be the products of the interaction of low- and intermediate-mass binaries, which occurred when the most ...
M. Saladino, O. Pols
semanticscholar +1 more source
A CORAVEL radial-velocity monitoring of giant Ba and S stars: Spectroscopic orbits and intrinsic variations. I. [PDF]
, 1998 With the aim of deriving the binary frequency among Ba and S stars, 56 new spectroscopic orbits (46 and 10, respectively) have been derived for these chemically- peculiar red giants monitored with the CORAVEL spec- trometers.
S. Udry +5 more
semanticscholar +1 more source