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arXiv:astro-ph/0403637 (astro-ph)
[Submitted on 27 Mar 2004]

Title:uvby(-$β$) photometry of high-velocity and metal-poor stars X. Stars of very low metal abundance: observations, reddenings, metallicities, classifications, distances, and relative ages

Authors:W. J. Schuster, T. C. Beers, R. Michel, P. E. Nissen, G. Garcia
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Abstract: uvby(--$\beta$) photometry has been obtained for an additional 411 very metal-poor stars selected from the HK survey, and used to derive basic parameters such as interstellar reddenings, metallicities, photometric classifications, distances, and relative ages... These very metal-poor stars are compared to M92 in the c_0,(b-y)_0 diagram, and evidence is seen for field stars 1-3 Gyrs younger than this globular cluster. The significance of these younger very metal-poor stars is discussed in the context of Galactic evolution, mentioning such possibilities as hierarchical star-formation/mass-infall of very metal-poor material and/or accretion events whereby this material has been acquired from other (dwarf) galaxies with different formation and chemical-enrichment histories
Comments: 20 pages, 11 figures, and 9 tables
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:astro-ph/0403637
  (or arXiv:astro-ph/0403637v1 for this version)
  https://doi.org/10.48550/arXiv.astro-ph/0403637
Journal reference: Astron.Astrophys. 422 (2004) 527-543
Related DOI: https://doi.org/10.1051/0004-6361%3A20035655

Submission history

From: William Schuster [view email]
[v1] Sat, 27 Mar 2004 04:37:31 UTC (256 KB)
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