Exploring the S-process History in the Galactic Disk: Cerium Abundances and Gradients in Open Clusters from the OCCAM/APOGEE Sample

被引：22

作者：

Sales-Silva, J. V. ^{[1
]}

Daflon, S. ^{[1
]}

Cunha, K. ^{[1
,2
]}

Souto, D. ^{[3
]}

Smith, V. V. ^{[4
]}

Chiappini, C. ^{[5
]}

Donor, J. ^{[6
]}

Frinchaboy, P. M. ^{[6
]}

Garcia-Hernandez, D. A. ^{[7
,8
]}

Hayes, C. ^{[9
]}

Majewski, S. R. ^{[10
]}

Masseron, T. ^{[7
,8
]}

Schiavon, R. P. ^{[11
]}

Weinberg, D. H. ^{[12
,13
,14
]}

Beaton, R. L. ^{[15
]}

Fernandez-Trincado, J. G. ^{[16
,17
]}

Jonsson, H. ^{[18
]}

Lane, R. R. ^{[19
]}

Minniti, D. ^{[20
,21
]}

Manchado, A. ^{[7
,8
,22
]}

Moni Bidin, C. ^{[16
]}

Nitschelm, C. ^{[23
]}

O'Connell, J. ^{[24
]}

Villanova, S. ^{[24
]}

机构：

[1] Observ Nacl MCTIC, R Gen Jose Cristino 77, BR-20921400 Rio De Janeiro, Brazil

[2] Univ Arizona, Steward Observ, Tucson, AZ 85719 USA

[3] Univ Fed Sergipe, Dept Fis, Ave Marechal Rondon S-N, BR-49000 Sao Cristovao, SE, Brazil

[4] Noirlab, Tucson, AZ 85719 USA

[5] Leibniz Inst Astrophys Potsdam AIP, Sternwarte 16, D-14482 Potsdam, Germany

[6] Texas Christian Univ, Dept Phys & Astron, TCU Box 298840, Ft Worth, TX 76129 USA

[7] Inst Astrofis Canarias IAC, E-38205 Tenerife, Spain

[8] Univ La Laguna ULL, Dept Astrofis, E-38206 Tenerife, Spain

[9] Univ Washington, Dept Astron, Box 351580, Seattle, WA 98195 USA

[10] Univ Virginia, Dept Astron, Charlottesville, VA 22904 USA

[11] Liverpool John Moores Univ, Astrophys Res Inst, Liverpool L3 5RF, Merseyside, England

[12] Ohio State Univ, Dept Astron, 174 W 18th Ave, Columbus, OH 43210 USA

[13] Ohio State Univ, Ctr Cosmol & AstroParticle Phys, Columbus, OH 43210 USA

[14] Inst Adv Study, Olden Lane, Princeton, NJ 08540 USA

[15] Carnegie Observ, 813 Santa Barbara St, Pasadena, CA 91101 USA

[16] Univ Catolica Norte, Inst Astron, Ave Angamos 0610, Antofagasta, Chile

[17] Univ Atacama, Inst Astron & Ciencias Planetarias, Copayapu 485, Copiapo, Chile

[18] Malmo Univ, Mat Sci & Appl Math, SE-20506 Malmo, Sweden

[19] Univ Bernardo OHiggins, Ctr Invest Astron, Ave Viel 1497, Santiago, Chile

[20] Univ Andres Bello, Dept Ciencias Fis, Fac Ciencias Exactas, Ave Fernandez Concha 700, Santiago, Chile

[21] Vatican Observ, I-00120 Vatican City, Vatican

[22] Inst Astrofis Canarias, C Via Lactea S-N, San Cristobal De Laguna 38205, Santa Cruz De T, Spain

[23] Univ Antofagasta, Ctr Astron CITEVA, Ave Angamos 601, Antofagasta 1270300, Chile

[24] Univ Concepcion, Dept Astron, Casilla 160-C, Concepcion, Chile

来源：

ASTROPHYSICAL JOURNAL | 2022年 / 926卷 / 02期

基金：

美国安德鲁·梅隆基金会; 美国国家科学基金会;

关键词：

GIANT BRANCH STARS; NEUTRON-CAPTURE ELEMENTS; RED GIANTS; PROCESS NUCLEOSYNTHESIS; CHEMICAL ABUNDANCES; MILKY-WAY; EVOLUTION; MODELS; DEPENDENCE; TELESCOPE;

D O I：

10.3847/1538-4357/ac4254

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The APOGEE Open Cluster Chemical Abundances and Mapping survey is used to probe the chemical evolution of the s-process element cerium in the Galactic disk. Cerium abundances were derived from measurements of Ce ii lines in the APOGEE spectra using the Brussels Automatic Code for Characterizing High Accuracy Spectra in 218 stars belonging to 42 open clusters. Our results indicate that, in general, for ages < 4 Gyr, younger open clusters have higher [Ce/Fe] and [Ce/alpha-element] ratios than older clusters. In addition, metallicity segregates open clusters in the [Ce/X]-age plane (where X can be H, Fe, or the alpha-elements O, Mg, Si, or Ca). These metallicity-dependent relations result in [Ce/Fe] and [Ce/alpha] ratios with ages that are not universal clocks. Radial gradients of [Ce/H] and [Ce/Fe] ratios in open clusters, binned by age, were derived for the first time, with d[Ce/H]/d R (GC) being negative, while d[Ce/Fe]/d R (GC) is positive. [Ce/H] and [Ce/Fe] gradients are approximately constant over time, with the [Ce/Fe] gradient becoming slightly steeper, changing by similar to+0.009 dex kpc(-1) Gyr(-1). Both the [Ce/H] and [Ce/Fe] gradients are shifted to lower values of [Ce/H] and [Ce/Fe] for older open clusters. The chemical pattern of Ce in open clusters across the Galactic disk is discussed within the context of s-process yields from asymptotic giant branch (AGB) stars, gigayear time delays in Ce enrichment of the interstellar medium, and the strong dependence of Ce nucleosynthesis on the metallicity of its AGB stellar sources.

引用

页数：19

共 4 条

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