Iron-peak Element Abundances in Warm Very Metal-poor Stars

被引：10

作者：

Sneden, Christopher ^{[1
,2
]}

Boesgaard, Ann Merchant ^{[3
]}

Cowan, John J. ^{[4
]}

Roederer, Ian U. ^{[5
,6
]}

Den Hartog, Elizabeth A. ^{[7
]}

Lawler, James E. ^{[7
]}

机构：

[1] Univ Texas Austin, Dept Astron, Austin, TX 78712 USA

[2] Univ Texas Austin, McDonald Observ, Austin, TX 78712 USA

[3] Univ Hawaii Manoa, Inst Astron, 2680 Woodlawn Dr, Honolulu, HI 96822 USA

[4] Univ Oklahoma, Homer L Dodge Dept Phys & Astron, Norman, OK 73019 USA

[5] Univ Michigan, Dept Astron, 1085 S Univ Ave, Ann Arbor, MI 48109 USA

[6] Ctr Evolut Elements JINA CEE, Joint Inst Nucl Astrophys, Notre Dame, IN USA

[7] Univ Wisconsin Madison, Dept Phys, 1150 Univ Ave, Madison, WI 53706 USA

来源：

ASTROPHYSICAL JOURNAL | 2023年 / 953卷 / 01期

基金：

美国国家科学基金会;

关键词：

I OSCILLATOR-STRENGTHS; LABORATORY TRANSITION-PROBABILITIES; CORE-COLLAPSE SUPERNOVAE; R-PROCESS ALLIANCE; LOG(GF) VALUES; SPECTROSCOPIC ANALYSIS; DETAILED ABUNDANCES; NLTE ABUNDANCES; PROCESS-RICH; CU II;

D O I：

10.3847/1538-4357/accd62

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We have derived new detailed abundances of Mg, Ca, and the Fe-group elements Sc through Zn (Z = 21-30) for 37 main-sequence turnoff very metal-poor stars ([Fe/H] & LSIM;-2.1). We analyzed Keck HIRES optical and near-UV high signal-to-noise spectra originally gathered for a Be abundance survey. Using typically & SIM;400 Fe-group lines with accurate laboratory transition probabilities for each star, we have determined accurate LTE metallicities and abundance ratios for neutral and ionized species of the 10 Fe-group elements as well as & alpha; elements Mg and Ca. We find good neutral/ion abundance agreement for the six elements that have detectable transitions of both species in our stars in the 3100-5800 & ANGS; range. Earlier reports of correlated Sc-Ti-V relative overabundances are confirmed, and appear to slowly increase with decreasing metallicity. To this element trio we add Zn; it also appears to be increasingly overabundant in the lowest-metallicity regimes. Co appears to mimic the behavior of Zn, but issues surrounding its abundance reliability cloud its interpretation.

引用

页数：18

共 76 条

[11] Abundances in very metal-poor dwarf stars [J].

Cohen, JG ;

Christlieb, N ;

McWilliam, A ;

Shectman, S ;

Thompson, I ;

Ivans, I ;

Dehn, M ;

Karlsson, T ;

Melendez, J .

ASTROPHYSICAL JOURNAL, 2004, 612 (02) :1107-1135

[12] New extremely metal-poor stars in the Galactic halo [J].

Cohen, Judith G. ;

Christlieb, Norbert ;

McWilliam, Andrew ;

Shectman, Stephen ;

Thompson, Ian ;

Melendez, Jorge ;

Wisotzki, Lutz ;

Reimers, Dieter .

ASTROPHYSICAL JOURNAL, 2008, 672 (01) :320-341

[13] Origin of the heaviest elements: The rapid neutron-capture process [J].

Cowan, John J. ;

Sneden, Christopher ;

Lawler, James E. ;

Aprahamian, Ani ;

Wiescher, Michael ;

Langanke, Karlheinz ;

Martinez-Pinedo, Gabriel ;

Thielemann, Friedrich-Karl .

REVIEWS OF MODERN PHYSICS, 2021, 93 (01)

[14] Detailed Iron-peak Element Abundances in Three Very Metal-poor Stars [J].

Cowan, John J. ;

Sneden, Christopher ;

Roederer, Ian U. ;

Lawler, James E. ;

Den Hartog, Elizabeth A. ;

Sobeck, Jennifer S. ;

Boesgaard, Ann Merchant .

ASTROPHYSICAL JOURNAL, 2020, 890 (02)

[15] PUSHing Core-collapse Supernovae to Explosions in Spherical Symmetry. III. Nucleosynthesis Yields [J].

Curtis, Sanjana ;

Ebinger, Kevin ;

Froehlich, Carla ;

Hempel, Matthias ;

Perego, Albino ;

Liebendoerfer, Matthias ;

Thielemann, Friedrich-Karl .

ASTROPHYSICAL JOURNAL, 2019, 870 (01)

[16] Atomic Transition Probabilities of Neutral Calcium* [J].

Den Hartog, E. A. ;

Lawler, J. E. ;

Sneden, C. ;

Cowan, J. J. ;

Roederer, I. U. ;

Sobeck, J. .

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 2021, 255 (02)

[17] Atomic Transition Probabilities for UV and Blue Lines of Fe II and Abundance Determinations in the Photospheres of the Sun and Metal-poor Star HD 84937 [J].

Den Hartog, E. A. ;

Lawler, J. E. ;

Sneden, C. ;

Cowan, J. J. ;

Brukhovesky, A. .

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 2019, 243 (02)

[18] Fe I OSCILLATOR STRENGTHS FOR TRANSITIONS FROM HIGH-LYING EVEN-PARITY LEVELS [J].

Den Hartog, E. A. ;

Ruffoni, M. P. ;

Lawler, J. E. ;

Pickering, J. C. ;

Lind, K. ;

Brewer, N. R. .

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 2014, 215 (02)

[19] IMPROVED log(gf) VALUES OF SELECTED LINES IN Mn I AND Mn II FOR ABUNDANCE DETERMINATIONS IN FGK DWARFS AND GIANTS [J].

Den Hartog, E. A. ;

Lawler, J. E. ;

Sobeck, J. S. ;

Sneden, C. ;

Cowan, J. J. .

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 2011, 194 (02)

[20] PUSHing Core-collapse Supernovae to Explosions in Spherical Symmetry. IV. Explodability, Remnant Properties, and Nucleosynthesis Yields of Low-metallicity Stars* [J].

Ebinger, Kevin ;

Curtis, Sanjana ;

Ghosh, Somdutta ;

Frohlich, Carla ;

Hempel, Matthias ;

Perego, Albino ;

Liebendoerfer, Matthias ;

Thielemann, Friedrich-Karl .

ASTROPHYSICAL JOURNAL, 2020, 888 (02)

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