Results 1 to 10 of about 158,293 (319)
Th Ages for Metal‐poor Stars [PDF]
The Astrophysical Journal, 2001 With a sample of 22 metal-poor stars, we demonstrate that the heavy element abundance pattern (Z > 55) is the same as the r-process contributions to the solar nebula. This bolsters the results of previous studies that there is a universal r-process production pattern.
Michael Bolte, Jennifer A. Johnson
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THE BEST AND BRIGHTEST METAL-POOR STARS [PDF]
The Astrophysical Journal, 2014 28 pages, 6 figures, and 4 tables in emulateapj format; accepted for publication in ...
Kevin C. Schlaufman +2 more
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A Model for Abundances in Metal‐poor Stars [PDF]
The Astrophysical Journal, 2001 It is argued that the abundances of r-process related elements in stars with -3100 solar masses) stars that are formed from Big Bang debris and are distinct from SNII, and two types of SNII, the H and L events, which can occur only at [Fe/H]>-3.
Qian, Y.-Z., Wasserburg, G. J.
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Probing Massive Star Nucleosynthesis with Data on Metal-Poor Stars and the Solar System [PDF]
EPJ Web of Conferences, 2022 Metal-poor stars were formed during the early epochs when only massive stars had time to evolve and contribute to the chemical enrichment. Low-mass metal-poor stars survive until the present and provide fossil records of the nucleosynthesis of early ...
Qian Yong-Zhong
doaj +1 more source
Oxygen Abundances in Metal‐poor Stars [PDF]
The Astrophysical Journal, 2003 We present oxygen abundances derived from both the permitted and forbidden oxygen lines for 55 subgiants and giants with [Fe/H] values between -2.7 and solar with the goal of understanding the discrepancy in the derived abundances. A first attempt, using \teff{} values from photometric calibrations and surface gravities from luminosities, obtained ...
Jon P. Fulbright +2 more
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Matter accretion in metal-poor stars down to extremely metal-poor stars and the lithium problem [PDF]
Astronomy & Astrophysics, 2021 Context. The formation and evolution of light elements in the Universe act as important cosmological constraints. It has long been assumed that the oldest stars of the Galaxy display the primordial lithium abundance in their outer layers, although studies of stellar physics have proven that this abundance must have decreased with time.
Sylvie Vauclair +3 more
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Extremely Metal-Poor Asymptotic Giant Branch Stars
Universe, 2022 Little is known about the first stars, but hints on this stellar population can be derived from the peculiar chemical composition of the most metal-poor objects in the Milky Way and in resolved stellar populations of nearby galaxies.
Mario Cirillo +2 more
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NEAR-IR PHOTOMETRIC PROPERTIES OF HB, MSTO, AND SGB FOR METAL POOR GALACTIC GLOBULAR CLUSTERS [PDF]
Journal of Astronomy and Space Sciences, 2007 We report photometric features of the HB, MSTO, and SGB for a set of metal-poor Galactic globular clusters on the near-IR CMDs. The magnitude and color of the MSTO and SGB are measured on the fiducial normal points of the CMDs by applying a polynomial ...
J.-W. Kim +4 more
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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
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Proceedings of the International Astronomical Union, 2004 We review the discovery of blue metal-poor (BMP) stars and the resolution of this population into blue stragglers and intermediate-age Main-Sequence stars by use of binary fractions. We show that the specific frequencies of blue stragglers in the halo field and in globular clusters differ by an order of magnitude.
Christopher Sneden, George W. Preston
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