An r-process Enhanced Star in the Dwarf Galaxy Tucana III

被引：98

作者：

Hansen, T. T. ^{[1
]}

Simon, J. D. ^{[1
]}

Marshall, J. L. ^{[2
,3
]}

Li, T. S. ^{[2
,3
,4
]}

Carollo, D. ^{[5
,6
]}

DePoy, D. L. ^{[2
,3
]}

Nagasawa, D. Q. ^{[2
,3
]}

Bernstein, R. A. ^{[1
]}

Drlica-Wagner, A. ^{[4
]}

Abdalla, F. B. ^{[7
,8
]}

Allam, S. ^{[4
]}

Annis, J. ^{[4
]}

Bechtol, K. ^{[9
]}

Benoit-Levy, A. ^{[10
,11
]}

Brooks, D. ^{[7
]}

Buckley-Geer, E. ^{[4
]}

Carnero Rosell, A. ^{[12
,13
]}

Kind, M. Carrasco ^{[14
,15
]}

Carretero, J. ^{[16
,17
]}

Cunha, C. E. ^{[18
]}

da Costa, L. N. ^{[12
,13
]}

Desai, S. ^{[19
]}

Eifler, T. F. ^{[20
]}

Fausti Neto, A. ^{[12
]}

Flaugher, B. ^{[4
]}

Frieman, J. ^{[21
]}

Garcia-Bellido, J. ^{[22
]}

Gaztanaga, E. ^{[16
]}

Gerdes, D. W. ^{[23
]}

Gruen, D. ^{[18
,24
]}

Gruendl, R. A. ^{[14
,15
]}

Gschwend, J. ^{[12
,13
]}

Gutierrez, G. ^{[4
]}

James, D. J. ^{[25
,26
]}

Krause, E. ^{[18
]}

Kuehn, K. ^{[27
]}

Kuropatkin, N.

Lahav, O. ^{[7
]}

Miquel, R. ^{[17
,28
]}

Plazas, A. A. ^{[20
]}

Romer, A. K. ^{[29
]}

Sanchez, E. ^{[30
]}

Santiago, B. ^{[12
,31
]}

Scarpine, V. ^{[4
]}

Smith, R. C. ^{[26
]}

Soares-Santos, M. ^{[4
]}

Sobreira, F. ^{[12
,32
]}

Suchyta, E. ^{[33
]}

Swanson, M. E. C. ^{[15
]}

Tarle, G. ^{[23
]}

机构：

[1] Observ Carnegie Inst Washington, 813 Santa Barbara St, Pasadena, CA 91101 USA

[2] Texas A&M Univ, George P & Cynthia Woods Mitchell Inst Fundamenta, College Stn, TX 77843 USA

[3] Texas A&M Univ, Dept Phys & Astron, College Stn, TX 77843 USA

[4] Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA

[5] Osserv Astron Torino, INAF, Str Osservatorio 20, I-10020 Pino Torinese, Italy

[6] ARC Ctr Excellence All Sky Astrophys CAASTRO, Sydney, NSW, Australia

[7] UCL, Dept Phys & Astron, Gower St, London WC1E 6BT, England

[8] Rhodes Univ, Dept Phys & Elect, POB 94, ZA-6140 Grahamstown, South Africa

[9] LSST, 933 North Cherry Ave, Tucson, AZ 85721 USA

[10] CNRS, Inst Astrophys Paris, UMR 7095, F-75014 Paris, France

[11] UPMC Univ Paris 06, Sorbonne Univ, UMR 7095, Inst Astrophys Paris, F-75014 Paris, France

[12] Lab Interinst E Astron LIneA, Rua Gal Jose Cristino 77, BR-20921400 Rio De Janeiro, RJ, Brazil

[13] Observ Nacl, Rua Gal Jose Cristino 77, BR-20921400 Rio De Janeiro, RJ, Brazil

[14] Univ Illinois, Dept Astron, 1002 W Green St, Urbana, IL 61801 USA

[15] Natl Ctr Supercomp Applicat, 1205 West Clark St, Urbana, IL 61801 USA

[16] IEEC CSIC, Inst Ciencies Espai, Campus UAB,Carrer Can Magrans S-N, E-08193 Barcelona, Spain

[17] Barcelona Inst Sci & Technol, Inst Fis Altes Energies, Campus UAB, E-08193 Barcelona, Spain

[18] Stanford Univ, Kavli Inst Particle Astrophys & Cosmol, POB 2450, Stanford, CA 94305 USA

[19] IIT Hyderabad, Dept Phys, Kandi 502285, Telangana, India

[20] CALTECH, Jet Prop Lab, 4800 Oak Grove Dr, Pasadena, CA 91109 USA

[21] Univ Chicago, Kavli Inst Cosmol Phys, Chicago, IL 60637 USA

[22] Univ Autonoma Madrid, Inst Fis Teor UAM CSIC, E-28049 Madrid, Spain

[23] Univ Michigan, Dept Phys, Ann Arbor, MI 48109 USA

[24] SLAC Natl Accelerator Lab, Menlo Pk, CA 94025 USA

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

[26] Natl Opt Astron Observ, Cerro Tololo Inter Amer Observ, Casilla 603, La Serena, Chile

[27] Australian Astron Observ, N Ryde, NSW 2113, Australia

[28] Inst Catalana Rec & Estud Avancats, E-08010 Barcelona, Spain

[29] Univ Sussex, Dept Phys & Astron, Pevensey Bldg, Brighton BN1 9QH, E Sussex, England

[30] CIEMAT, Madrid, Spain

[31] Univ Fed Rio Grande do Sul, Inst Fis, Caixa Postal 15051, BR-91501970 Porto Alegre, RS, Brazil

[32] Univ Fed ABC, Ctr Ciencias Nat & Humanas, Av Estados 5001, BR-09210580 Santo Andre, SP, Brazil

[33] Oak Ridge Natl Lab, Comp Sci & Math Div, Oak Ridge, TN 37831 USA

来源：

ASTROPHYSICAL JOURNAL | 2017年 / 838卷 / 01期

基金：

澳大利亚研究理事会; 欧洲研究理事会; 美国国家科学基金会; 英国科学技术设施理事会;

关键词：

galaxies: abundances; galaxies: dwarf; stars: abundances; stars: chemically peculiar; METAL-POOR STARS; RED GIANT BRANCH; CHEMICAL EVOLUTION; SPECTROSCOPIC ANALYSIS; DETAILED ABUNDANCES; SPHEROIDAL GALAXIES; HEAVY-ELEMENTS; 1ST STARS; S-PROCESS; NUCLEOSYNTHESIS;

D O I：

10.3847/1538-4357/aa634a

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Chemically peculiar stars in dwarf galaxies provide a window for exploring the birth environment of stars with varying chemical enrichment. We present a chemical abundance analysis of the brightest star in the newly discovered ultra-faint dwarf galaxy candidate Tucana III. Because it is particularly bright for a star in an ultra-faint Milky Way (MW) satellite, we are able to measure the abundance of 28 elements, including 13 neutron-capture species. This star, DES. J235532.66-593114.9 (DES J235532), shows a mild enhancement in neutron-capture elements associated with the r-process and can be classified as an r-I star. DES. J235532 is the first r-I star to be discovered in an ultra-faint satellite, and Tuc. III is the second extremely low-luminosity system found to contain r-process enriched material, after Reticulum. II. Comparison of the abundance pattern of DES. J235532 with r-I and r-II stars found in other dwarf galaxies and in the MW halo suggests a common astrophysical origin for the neutron-capture elements seen in all r-process enhanced stars. We explore both internal and external scenarios for the r-process enrichment of Tuc. III and show that with abundance patterns for additional stars, it should be possible to distinguish between them.

引用

页数：11

共 80 条

[1] The Dark Energy Survey: more than dark energy - an overview [J].

Abbott, T. ;

Abdalla, F. B. ;

Aleksic, J. ;

Allam, S. ;

Amara, A. ;

Bacon, D. ;

Balbinot, E. ;

Banerji, M. ;

Bechtol, K. ;

Benoit-Levy, A. ;

Bernstein, G. M. ;

Bertin, E. ;

Blazek, J. ;

Bonnett, C. ;

Bridle, S. ;

Brooks, D. ;

Brunner, R. J. ;

Buckley-Geer, E. ;

Burke, D. L. ;

Caminha, G. B. ;

Capozzi, D. ;

Carlsen, J. ;

Carnero-Rosell, A. ;

Carollo, M. ;

Carrasco-Kind, M. ;

Carretero, J. ;

Castander, F. J. ;

Clerkin, L. ;

Collett, T. ;

Conselice, C. ;

Crocce, M. ;

Cunha, C. E. ;

D'Andrea, C. B. ;

da Costa, L. N. ;

Davis, T. M. ;

Desai, S. ;

Diehl, H. T. ;

Dietrich, J. P. ;

Dodelson, S. ;

Doel, P. ;

Drlica-Wagner, A. ;

Estrada, J. ;

Etherington, J. ;

Evrard, A. E. ;

Fabbri, J. ;

Finley, D. A. ;

Flaugher, B. ;

Foley, R. J. ;

Fosalba, P. ;

Frieman, J. .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2016, 460 (02) :1270-1299

[2] Carbon-enhanced metal-poor stars. I. Chemical compositions of 26 stars [J].

Aoki, Wako ;

Beers, Timothy C. ;

Christlieb, Norbert ;

Norris, John E. ;

Ryan, Sean G. ;

Tsangarides, Stelios .

ASTROPHYSICAL JOURNAL, 2007, 655 (01) :492-521

[3] Nucleosynthesis-relevant conditions in neutrino-driven supernova outflows - I. Spherically symmetric hydrodynamic simulations [J].

Arcones, A. ;

Janka, H.-Th. ;

Scheck, L. .

ASTRONOMY & ASTROPHYSICS, 2007, 467 (03) :1227-1248

[4] Neutrino-driven wind simulations and nucleosynthesis of heavy elements [J].

Arcones, A. ;

Thielemann, F-K .

JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS, 2013, 40 (01)

[5] The Chemical Composition of the Sun [J].

Asplund, Martin ;

Grevesse, Nicolas ;

Sauval, A. Jacques ;

Scott, Pat .

ANNUAL REVIEW OF ASTRONOMY AND ASTROPHYSICS, VOL 47, 2009, 47 :481-522

[6] The Hamburg/ESO R-process enhanced star survey (HERES) - II. Spectroscopic analysis of the survey sample [J].

Barklem, PS ;

Christlieb, N ;

Beers, TC ;

Hill, V ;

Bessell, MS ;

Holmberg, J ;

Marsteller, B ;

Rossi, S ;

Zickgraf, FJ ;

Reimers, D .

ASTRONOMY & ASTROPHYSICS, 2005, 439 (01) :129-+

[7] SYSTEMATICS OF DYNAMICAL MASS EJECTION, NUCLEOSYNTHESIS, AND RADIOACTIVELY POWERED ELECTROMAGNETIC SIGNALS FROM NEUTRON-STAR MERGERS [J].

Bauswein, A. ;

Goriely, S. ;

Janka, H. -T. .

ASTROPHYSICAL JOURNAL, 2013, 773 (01)

[8] EIGHT NEW MILKY WAY COMPANIONS DISCOVERED IN FIRST-YEAR DARK ENERGY SURVEY DATA [J].

Bechtol, K. ;

Drlica-Wagner, A. ;

Balbinot, E. ;

Pieres, A. ;

Simon, J. D. ;

Yanny, B. ;

Santiago, B. ;

Wechsler, R. H. ;

Frieman, J. ;

Walker, A. R. ;

Williams, P. ;

Rozo, E. ;

Rykoff, E. S. ;

Queiroz, A. ;

Luque, E. ;

Benoit-Levy, A. ;

Tucker, D. ;

Sevilla, I. ;

Gruendl, R. A. ;

da Costa, L. N. ;

Fausti Neto, A. ;

Maia, M. A. G. ;

Abbott, T. ;

Allam, S. ;

Armstrong, R. ;

Bauer, A. H. ;

Bernstein, G. M. ;

Bernstein, R. A. ;

Bertin, E. ;

Brooks, D. ;

Buckley-Geer, E. ;

Burke, D. L. ;

Carnero Rosell, A. ;

Castander, F. J. ;

Covarrubias, R. ;

D'Andrea, C. B. ;

DePoy, D. L. ;

Desai, S. ;

Diehl, H. T. ;

Eifler, T. F. ;

Estrada, J. ;

Evrard, A. E. ;

Fernandez, E. ;

Finley, D. A. ;

Flaugher, B. ;

Gaztanaga, E. ;

Gerdes, D. ;

Girardi, L. ;

Gladders, M. ;

Gruen, D. .

ASTROPHYSICAL JOURNAL, 2015, 807 (01)

[9] The discovery and analysis of very metal-poor stars in the Galaxy [J].

Beers, TC ;

Christlieb, N .

ANNUAL REVIEW OF ASTRONOMY AND ASTROPHYSICS, 2005, 43 :531-580

[10] MIKE: A double echelle spectrograph for the Magellan Telescopes at Las Campanas Observatory. [J].

Bernstein, RA ;

Shectman, SA ;

Gunnels, S ;

Mochnacki, S ;

Athey, A .

INSTRUMENT DESIGN AND PERFORMANCE FOR OPTICAL/INFRARED GROUND-BASED TELESCOPES, PTS 1-3, 2003, 4841 :1694-1704

← 1 2 3 4 5 6 7 8 →