Browsing by Author "Andrews, Jeff J."

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    A Young, Low-density Stellar Stream in the Milky Way Disk: Theia 456
    (2022) Andrews, Jeff J.; Curtis, Jason L.; Chaname, Julio; Agueros, Marcel A.; Schuler, Simon C.; Kounkel, Marina; Covey, Kevin R.
    Our view of the variety of stellar structures pervading the local Milky Way has been transformed by the application of clustering algorithms to the Gaia catalog. In particular, several stellar streams have been recently discovered that are comprised of hundreds to thousands of stars and span several hundred parsecs. We analyze one such structure, Theia 456, a low-density stellar stream extending nearly 200 pc and 20 degrees across the sky. By supplementing Gaia astrometric data with spectroscopic metallicities from Large Sky Area Multi-Object Fiber Spectroscopic Telescope and photometric rotation periods from the Zwicky Transient Facility and the Transiting Exoplanet Survey Satellite, we establish Theia 456's radial velocity coherence, and we find strong evidence that members of Theia 456 have a common age (similar or equal to 175 Myr), common dynamical origin, and formed from chemically homogeneous prestellar material ([Fe/H] = -0.07 dex). Unlike well-known stellar streams in the Milky Way, which are in its halo, Theia 456 is firmly part of the thin disk. If our conclusions about Theia 456 can be applied to even a small fraction of the remaining similar or equal to 8300 independent structures in the Theia catalog, such low-density stellar streams may be ubiquitous. We comment on the implications this has for the nature of star formation throughout the Galaxy.
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    Using APOGEE wide binaries to test chemical tagging with dwarf stars
    (2019) Andrews, Jeff J.; Anguiano, Borja; Chaname, Julio; Agueros, Marcel A.; Lewis, Hannah M.; Hayes, Christian R.; Majewsk, Steven R.
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    Wide Binaries in TGAS: Search Method and First Results
    (2017) Andrews, Jeff J.; Chaname, Julio; Agueros, Marcel A.
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    Wide binaries in Tycho-Gaia II: metallicities, abundances and prospects for chemical tagging
    (2018) Andrews, Jeff J.; Chaname, Julio; Agueros, Marcel A.