Results 11 to 20 of about 10,737,866 (298)
The stochastic enrichment of Population II stars [PDF]
Monthly Notices of the Royal Astronomical Society, 2020 ABSTRACT We investigate the intrinsic scatter in the chemical abundances of a sample of metal-poor ([Fe/H] < −2.5) Milky Way halo stars. We draw our sample from four historic surveys and focus our attention on the stellar Mg, Ca, Ni, and Fe abundances.
Louise Welsh +2 more
openaire +6 more sources
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
Variable stars in Galactic globular clusters
Astronomy & AstrophysicsWe identified a sample of 88 bona fide Population II Cepheids (henceforth referred to as Cepheids) and 44 candidates in Galactic globular clusters (GCs). Seventy-eight of the Cepheids in the sample align within 2 σ of the period-luminosity relation for Milky Way Type II Cepheids (T2CEPs).
Mauricio Cruz Reyes +2 more
openaire +3 more sources
Massive binary black holes from Population II and III stars [PDF]
, 2023 Population III stars, born from the primordial gas in the Universe, lose a negligible fraction of their mass via stellar winds and possibly follow a top-heavy mass function.
Ralf S Klessen +15 more
core +1 more source
Theoretical results of one class of multiderivative methods through order stars [PDF]
, 2011 Order stars are applied to Brown (K,L) methods. They are displayed pictorially for a selection of methods and are used to provide succinct proofs of existing results.
Meneguette, Messias +6 more
core +4 more sources
Lithium In Population II Stars [PDF]
Highlights of Astronomy, 1995 AbstractSince the work of Spite & Spite (1982), halo main sequence turn-off stars have usually been considered a site where Li synthesized in the Big-Bang is wholly preserved and uncontaminated by other Li sources. However, the interpretation of halo dwarf Li abundances has become more complex as new samples of halo star Li I observations have ...
openaire +1 more source
Wide binary stars in the Galactic field : a statistical approach [PDF]
, 2010 This thesis focuses on the statistical properties of wide binary (WB) star systems in the Galactic field. With projected separations larger than 200 AU and, consequently, having very low binding energies, WB are sensitive probes of the Galactic ...
Longhitano, Marco
core +1 more source
Deficiency of Metals in Population II Stars [PDF]
Nature, 1963 IN a recent communication under this title Bashkin1 has attempted to explain the deficiency of heavy elements in Population II halo stars by arguing that a separation between neutral atoms and ions is possible through electromagnetic means and that, since the ionization potentials of the metals are in general low, they will be confined to the disk ...
GEORGE WALLERSTEIN, E. MARGARET BURBIDGE
openaire +3 more sources
Unique Chemical Composition of the Very Metal-poor Star LAMOST J1645+4357
The Astrophysical Journal, 2023 We report on the chemical composition of the very metal-poor (VMP; [Fe/H] = −2.9) star LAMOST J1645+4357, which was identified as a red giant having peculiar abundance ratios by Li et al. The standard abundance analysis is carried out for this object and
Wako Aoki +5 more
doaj +1 more source
Cosmic reionization by stellar sources: Population II stars [PDF]
Monthly Notices of the Royal Astronomical Society, 2003 We study the reionisation of the Universe by stellar sources using a numerical approach that combines fast 3D radiative transfer calculations with high resolution hydrodynamical simulations. Ionising fluxes for the sources are derived from intrinsic star formation rates computed in the underlying hydrodynamical simulations.
Sokasian, Aaron +3 more
openaire +5 more sources