Journal
ASTROPHYSICAL JOURNAL
Volume 833, Issue 2, Pages -Publisher
IOP Publishing Ltd
DOI: 10.3847/1538-4357/833/2/262
Keywords
Galaxy: abundances; Galaxy: stellar content; Galaxy: structure; globular clusters: general; open clusters and associations: general; stars: abundances
Categories
Funding
- NSF [IIS-1124794, AST-1312863, AST-1517237]
- NASA [NNX12AI50G]
- Moore-Sloan Data Science Environment at NYU
- Australian Research Council (DECRA Fellowship) [DE140100598]
- European Research Council under the European Union's Seventh Framework Programme (FP 7) ERC [320360, 321035]
- Alfred P. Sloan Foundation, the Participating Institutions
- National Science Foundation
- U.S. Department of Energy Office of Science
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [1109178] Funding Source: National Science Foundation
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [1517237] Funding Source: National Science Foundation
- Div Of Information & Intelligent Systems
- Direct For Computer & Info Scie & Enginr [1124794] Funding Source: National Science Foundation
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Chemical tagging promises to use detailed abundance measurements to identify spatially separated stars that were, in fact, born together (in the same molecular cloud) long ago. This idea has not yielded much practical success, presumably because of the noise and incompleteness in chemical-abundance measurements. We have succeeded in substantially improving spectroscopic measurements with The. Cannon, which has now delivered 15 individual abundances for similar to 10(5) stars observed as part of the APOGEE spectroscopic survey, with precisions around 0.04. dex. We test the chemical-tagging hypothesis by looking at clusters in abundance space and confirming that they are clustered in phase space. We identify (by the k-means algorithm) overdensities of stars in the 15-dimensional chemical-abundance space delivered by The. Cannon, and plot the associated stars in phase space. We use only abundance-space information (no positional information) to identify stellar groups. We find that clusters in abundance space are indeed clusters in phase space, and we. recover some known phase-space clusters and find other interesting structures. This is the first-ever project to identify phase-space structures at the survey-scale by blind search purely in abundance space; it verifies the precision of the abundance measurements delivered by The. Cannon; the prospects for future data sets appear very good.
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