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

Mishenina, T.; Pignatari, M.; Gorbaneva, T.; Travaglio, C.; Côté, B.; Thielemann, F.-K; Soubiran, C.


T. Mishenina

M. Pignatari

T. Gorbaneva

C. Travaglio

B. Côté

F.-K Thielemann

C. Soubiran


© 2019 The Author(s). 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 Å for 209 stars and Ru I lines at 4080, 4584, 4757 Å 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 ofMo 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.


Mishenina, T., Pignatari, M., Gorbaneva, T., Travaglio, C., Côté, B., Thielemann, F., & Soubiran, C. (2019). Enrichment of the Galactic disc with neutron-capture elements: Mo and Ru. Monthly notices of the Royal Astronomical Society, 489(2), 1697-1708.

Journal Article Type Article
Acceptance Date Aug 7, 2019
Publication Date Jan 1, 2019
Deposit Date Aug 14, 2019
Publicly Available Date Aug 14, 2019
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Oxford University Press
Peer Reviewed Peer Reviewed
Volume 489
Issue 2
Pages 1697-1708
Keywords Stars: abundances; Stars: late-type; Galaxy: disc; Galaxy: evolution
Public URL
Publisher URL


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Copyright Statement
© 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society<br /> <br /> This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (

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