Enrichment of the Galactic disc with neutron-capture elements: Mo and Ru

被引:12
作者
Mishenina, T. [1 ]
Pignatari, M. [2 ,3 ,4 ]
Gorbaneva, T. [1 ]
Travaglio, C. [5 ,6 ]
Cote, B. [3 ,4 ]
Thielemann, F-K [7 ,8 ]
Soubiran, C. [9 ]
机构
[1] Odessa Natl Univ, Astron Observ, Shevchenko Pk, UA-65014 Odessa, Ukraine
[2] Univ Hull, EA Milne Ctr Astrophys, Dept Phys & Math, Kingston Upon Hull HU6 7RX, N Humberside, England
[3] Hungarian Acad Sci, Konkoly Observ, Konkoly Thege Miklos Ut 15-17, H-1121 Budapest, Hungary
[4] Joint Inst Nucl Astrophys, Ctr Evolut Elements, 640 S Shaw Lane, E Lansing, MI 48824 USA
[5] Univ Turin, Ist Nazl Fis Nucl, Via Pietro Giuria 1, I-10025 Turin, Italy
[6] B2FH Assoc, I-10025 Turin, Italy
[7] Univ Basel, Dept Phys, Klingelbergstr 82, CH-4056 Basel, Switzerland
[8] GSI Helmholtzzentrum Schwerionenforsch, Planckstr 1, D-64291 Darmstadt, Germany
[9] Univ Bordeaux, Lab Astrophys Bordeaux, CNRS, B18N,Allee Geoffroy St Hilaire, F-33615 Pessac, France
基金
欧洲研究理事会; 瑞士国家科学基金会; 美国国家科学基金会;
关键词
stars: abundances; stars: late-type; Galaxy: disc; Galaxy: evolution; GIANT BRANCH STARS; S-PROCESS; P-PROCESS; MASSIVE STARS; PROCESS NUCLEOSYNTHESIS; NUCLEAR-PHYSICS; STELLAR NUCLEOSYNTHESIS; CHEMICAL EVOLUTION; SOLAR NEIGHBORHOOD; DRIVEN WINDS;
D O I
10.1093/mnras/stz2202
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present new observational data for the heavy elements molybdenum (Mo, Z = 42) and ruthenium (Ru, Z = 44) in F-, G-, and K-stars belonging to different substructures of the Milky Way. The range of metallicity covered is -1.0 < [Fe/H] < + 0.3. The spectra of Galactic disc stars have a high resolution of 42 000 and 75 000 and signal-to-noise ratio better than 100. Mo and Ru abundances were derived by comparing the observed and synthetic spectra in the region of Mo I lines at 5506, 5533 angstrom for 209 stars and Ru I lines at 4080, 4584, 4757 angstrom for 162 stars using the LTE approach. For all the stars, the Mo and Ru abundance determinations are obtained for the first time with an average error of 0.14 dex. This is the first extended sample of stellar observations for Mo and Ru in the Milky Way disc, and together with earlier observations in halo stars it is pivotal in providing a complete picture of the evolution of Mo and Ru across cosmic time-scales. The Mo and Ru abundances were compared with those of the neutron-capture elements (Sr, Y, Zr, Ba, Sm, Eu). The complex nucleosynthesis history of Mo and Ru is compared with different Galactic Chemical Evolution (GCE) simulations. In general, present theoretical GCE simulations show underproduction of Mo and Ru at all metallicities compared to observations. This highlights a significant contribution of nucleosynthesis processes not yet considered in our simulations. A number of possible scenarios are discussed.
引用
收藏
页码:1697 / 1708
页数:12
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