SIMBAD references

2022ApJ...927...13Z - Astrophys. J., 927, 13-13 (2022/March-1)

Metal-poor Stars Observed with the Southern African Large Telescope II. An Extended Sample.

ZEPEDA J., RASMUSSEN K.C., BEERS T.C., PLACCO V.M., HUANG Y. and DEPAGNE E.

Abstract (from CDS):

We present results from high-resolution (R ∼ 40,000) spectroscopic observations of over 200 metal-poor stars, mostly selected from the RAVE survey, using the Southern African Large Telescope. We were able to derive stellar parameters for a total of 108 stars; an additional sample of 50 stars from this same effort was previously reported on by Rasmussen et al. Among our newly reported observations, we identify 84 very metal-poor (VMP; [Fe/H] < -2.0, 53 newly identified) stars and three extremely metal-poor (EMP; [Fe/H] < -3.0, one newly identified) stars. The elemental abundances were measured for carbon, as well as several other α-elements (Mg, Ca, Sc, and Ti), iron-peak elements (Mn, Co, Ni, and Zn), and neutron-capture elements (Sr, Ba, and Eu). Based on these measurements, the stars are classified by their carbon and neutron-capture abundances into carbon-enhanced metal-poor (CEMP; [C/Fe] > +0.70), CEMP subclasses, and by the level of their r-process abundances. A total of 17 are classified as CEMP stars. There are 11 CEMP-r stars (eight newly identified), one CEMP-s star (newly identified), two possible CEMP-i stars (one newly identified), and three CEMP-no stars (all newly identified) in this work. We found 11 stars (eight newly identified) that are strongly enhanced in r-process elements (r-II; [Eu/Fe] > +0.70), 38 stars (31 newly identified) that are moderately enhanced in r-process elements (r-I; +0.30 < [Eu/Fe] <= + 0.70), and one newly identified limited-r star.

Abstract Copyright: © 2022. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Milky Way stellar halo - Stellar abundances - Stellar atmospheres - CEMP stars - R-process - Population II stars

VizieR on-line data: <Available at CDS (J/ApJ/927/13): table2.dat table3.dat table4.dat table5.dat table6.dat table7.dat>

Status at CDS : Tables of objects mostly ingested in SIMBAD; some problems could not be solved.

Simbad objects: 110

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