NORMAL AND OUTLYING POPULATIONS OF THE MILKY WAY STELLAR HALO AT [Fe/H] <–2

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 com...

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Published in:The Astrophysical journal 2013-11, Vol.778 (1), p.1-29
Main Authors: Cohen, Judith G, Christlieb, Norbert, Thompson, Ian, McWilliam, Andrew, Shectman, Stephen, Reimers, Dieter, Wisotzki, Lutz, Kirby, Evan
Format: Article
Language:English
Subjects:
ABUNDANCE
APPROXIMATIONS
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
Bands
CAPTURE
Capture (nuclear)
CARBON
CARBON STARS
DISTRIBUTION
ELECTROMAGNETIC PULSES
Halos
Iron
METALS
MILKY WAY
NEUTRON REACTIONS
Outliers (statistics)
R PROCESS
RADIAL VELOCITY
S PROCESS
Stars
Strontium
TRITIUM
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cited_by cdi_FETCH-LOGICAL-c385t-65c307ae49e841cdd0e3b01f80ae2105847ee09bb801ded6101e5c53c2f263d3
cites cdi_FETCH-LOGICAL-c385t-65c307ae49e841cdd0e3b01f80ae2105847ee09bb801ded6101e5c53c2f263d3
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container_issue 1
container_start_page 1
container_title The Astrophysical journal
container_volume 778
creator Cohen, Judith G
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Wisotzki, Lutz
Kirby, Evan
description 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 C sub(2) bands are not preferentially binary systems. Ignoring Carbon stars, approximately 15% of our sample are strong ([> or =, slant] 5[sigma]) outliers in one or more elements between Mg and Ni; this rises to ~19% if very strong ([> or =, slant]10[sigma]) 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,A1/Fe] enhancements; and HE1226-1149, an extremely r-process rich star.
doi_str_mv 10.1088/0004-637X/778/1/56
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source EZB Electronic Journals Library
subjects ABUNDANCE
APPROXIMATIONS
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
Bands
CAPTURE
Capture (nuclear)
CARBON
CARBON STARS
DISTRIBUTION
ELECTROMAGNETIC PULSES
Halos
Iron
METALS
MILKY WAY
NEUTRON REACTIONS
Outliers (statistics)
R PROCESS
RADIAL VELOCITY
S PROCESS
Stars
Strontium
TRITIUM
title NORMAL AND OUTLYING POPULATIONS OF THE MILKY WAY STELLAR HALO AT [Fe/H] <–2
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