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Evidence for very nearby hidden white dwarfs
Fuhrmann, K.1,2; Chini, R.1,3; Kaderhandt, L.1; Chen, Z.1,4,5; Lachaume, R.6,7
2016-06-21
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume459Issue:2Pages:1682-1686
AbstractWe report the discovery of a tertiary component to the prominent and nearby (d = 14 pc) visual binary alpha Fornacis. The new invisible component is part of a 4-d short-period Ba-Bb subsystem, whose K-type alpha For Ba primary shows a striking [Ba/Fe] = +0.26 dex overabundance, at variance with a close to solar [Ba/Fe] = +0.04 dex abundance for its distant visual companion alpha For A. For the even nearer (d = 8 pc) multiple star xi Ursae Majoris and its alike 4-d Ba-Bb subsystem, we similarly find [Ba/Fe] = +0.37 dex for its G-type xi UMa Ba primary, compared to a significantly lower [Ba/Fe] = +0.12 dex for the visual companion xi UMa A. In both cases, the differential barium enrichment is direct evidence for short-period white dwarf systems and the creation of blue straggler stars through mass transfer and wind accretion, for their close and distant companions, respectively. These findings also imply that conventional stellar age datings for both alpha For and xi UMa are likely not reliable.
KeywordBinaries: Spectroscopic Binaries: Visual Blue Stragglers Stars: Individual: (Alpha For, Xi Uma) Stars: Solar-type White Dwarfs
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1093/mnras/stw760
WOS KeywordFIELD BLUE STRAGGLERS ; PROPER-MOTION STARS ; SPECTROSCOPIC BINARIES ; SUN KINEMATICS ; BARIUM ; MULTIPLICITY ; EVOLUTION ; ROTATION ; REGULUS ; SYSTEMS
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000377471200041
Citation statistics
Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/16237
Collection暗物质和空间天文实验室
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,Casilla 1280, 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. Evidence for very nearby hidden white dwarfs[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2016,459(2):1682-1686.
APA Fuhrmann, K.,Chini, R.,Kaderhandt, L.,Chen, Z.,&Lachaume, R..(2016).Evidence for very nearby hidden white dwarfs.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,459(2),1682-1686.
MLA Fuhrmann, K.,et al."Evidence for very nearby hidden white dwarfs".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 459.2(2016):1682-1686.
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