SIMBAD references

2013ApJ...778...56C - Astrophys. J., 778, 56 (2013/November-3)

Normal and outlying populations of the Milky Way stellar halo at [Fe/H] ←2.

COHEN J.G., CHRISTLIEB N., THOMPSON I., McWILLIAM A., SHECTMAN S., REIMERS D., WISOTZKI L. and KIRBY E.

Abstract (from CDS):

From detailed abundance analysis of >100 Hamburg/ESO candidate extremely metal-poor (EMP) stars we find 45 with [Fe/H] < -3.0 dex. We identify a heretofore unidentified group: Ca-deficient stars with sub-solar [Ca/Fe] ratios and the lowest neutron-capture abundances; the Ca-deficient group comprises ∼10% of the sample, excluding Carbon stars. Our radial velocity distribution shows that the carbon-enhanced stars with no s-process enhancements, CEMP-no, and which do not show C2 bands are not preferentially binary systems. Ignoring Carbon stars, approximately 15% of our sample are strong ( ≥ 5σ) outliers in one or more elements between Mg and Ni; this rises to ∼19% if very strong ( ≥ 10σ) outliers for Sr and Ba are included. Examples include: HE0305-0554 with the lowest [Ba/H] known; HE1012-1540 and HE2323-0256, two (non-velocity variable) C-rich stars with very strong [Mg,Al/Fe] enhancements; and HE1226-1149, an extremely r-process rich star.

Abstract Copyright:

Journal keyword(s): Galaxy: abundances - Galaxy: formation - Galaxy: halo

VizieR on-line data: <Available at CDS (J/ApJ/778/56): table1.dat table2a.dat table2b.dat table3.dat table6.dat table7.dat table8.dat table10.dat>

Simbad objects: 144

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2021.10.22-02:49:02

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