Journal Article

Searching for the metal-weak thick disc in the solar neighbourhood

Bacham E. Reddy and David L. Lambert

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 391, issue 1, pages 95-109
Published in print November 2008 | ISSN: 0035-8711
Published online November 2008 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2008.13905.x
Searching for the metal-weak thick disc in the solar neighbourhood

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An abundance analysis is presented of 60 metal-poor stars drawn from catalogues of nearby stars provided by Arifyanto et al. and Schuster et al. In an attempt to isolate a sample of metal-weak thick disc stars, we applied the kinematic criteria Vrot≥ 100 km s−1, |ULSR| ≤ 140 km s−1 (LSR – local standard of rest) and |WLSR| ≤ 100 km s−1. 14 stars satisfying these criteria and having [Fe/H]≤−1.0 are included in the sample of 60 stars. Eight of the 14 have [Fe/H]≥−1.3 and may be simply thick disc stars of slightly lower than average [Fe/H]. The other six have [Fe/H] from −1.3 to −2.3 and are either metal-weak thick disc stars or halo stars with kinematics mimicking those of the thick disc. The sample of 60 stars is completed by eight thick disc stars, 20 stars of a hybrid nature (halo or thick disc stars) and 18 stars with kinematics distinctive of the halo.

Keywords: stars: abundances; stars: atmospheres; stars: kinematics; Galaxy: abundances; Galaxy: evolution

Journal Article.  10793 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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