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The barium-to-iron enrichment versus age relation of ancient disc stars
Fuhrmann, K.1,2; Chini, R.1,3; Kaderhandt, L.1; Chen, Z.4,5; Lachaume, R.6,7
2017-11-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
Volume471Issue:3Pages:3768-3774
Corresponding AuthorFuhrmann, K.(klaus@ing.iac.es)
AbstractWe report an intrinsically precise relation of the barium-to-iron enrichment as a function of age for a local, volume-complete (N = 30) sample of ancient Population II (tau >= 12 Gyr) and intermediate-disc stars (tau similar or equal to 10 Gyr), which suggests a common, r-process-dominated nucleosynthesis site for both elements in the early stages of the Milky Way. Deviants from this empirical relation are to a large extent identified as formerly known or new blue straggler stars. We report in particular the striking case of the Population II star HD159062, whose barium overabundance is difficult to explain without wind accretion of s-process material from a former asymptotic giant branch (AGB) primary that very likely survived as a white dwarf companion. The weak but significant barium enhancement that we measure for HR3578 and 104 Tau also suggests that both may be accompanied by faint degenerate companions. If confirmed through precision astrometry or direct imaging observations, this would mean a very efficient method to uncover ancient stellar remnant companions around solar-type stars.
Keywordstars: abundances blue stragglers stars: mass-loss stars: Population II stars: solar-type white dwarfs
DOI10.1093/mnras/stx1848
WOS KeywordNEUTRON-CAPTURE ELEMENTS ; SOLAR-TYPE STARS ; COOL DWARF STARS ; METAL-POOR STARS ; THICK-DISK ; CHEMICAL-COMPOSITION ; GALACTIC DISK ; HALO STARS ; R-PROCESS ; HEAVY-ELEMENTS
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000409035700090
PublisherOXFORD UNIV PRESS
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/22698
Collection中国科学院紫金山天文台
Corresponding AuthorFuhrmann, K.
Affiliation1.Ruhr Univ Bochum, Astron Inst, Univ Str 150, D-44801 Bochum, Germany
2.Isaac Newton Grp Telescopes, Apartado 321, E-38700 Santa Cruz De La Palma, Spain
3.Univ Catolica Norte, Inst Astron, Ave Angamos 0610, Antofagasta, Chile
4.Chinese Acad Sci, Purple Mt Observ, 2 West Beijing Rd, Nanjing 210008, Jiangsu, Peoples R China
5.Chinese Acad Sci, Key Lab Radio Astron, 2 West Beijing Rd, Nanjing 210008, Jiangsu, Peoples R China
6.Pontificia Univ Catolica Chile, Inst Astrofis, Fac Fis, Ctr Astroingn, Casilla 306, Santiago 8970117 22, Chile
7.Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany
Recommended Citation
GB/T 7714
Fuhrmann, K.,Chini, R.,Kaderhandt, L.,et al. The barium-to-iron enrichment versus age relation of ancient disc stars[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2017,471(3):3768-3774.
APA Fuhrmann, K.,Chini, R.,Kaderhandt, L.,Chen, Z.,&Lachaume, R..(2017).The barium-to-iron enrichment versus age relation of ancient disc stars.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,471(3),3768-3774.
MLA Fuhrmann, K.,et al."The barium-to-iron enrichment versus age relation of ancient disc stars".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 471.3(2017):3768-3774.
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