A Young, Low-density Stellar Stream in the Milky Way Disk: Theia 456

نویسندگان

چکیده

Abstract Our view of the variety stellar structures pervading local Milky Way has been transformed by application clustering algorithms to Gaia catalog. In particular, several streams have recently discovered that are comprised hundreds thousands stars and span hundred parsecs. We analyze one such structure, Theia 456, a low-density stream extending nearly 200 pc 20° across sky. By supplementing astrometric data with spectroscopic metallicities from Large Sky Area Multi-Object Fiber Spectroscopic Telescope photometric rotation periods Zwicky Transient Facility Transiting Exoplanet Survey Satellite, we establish 456's radial velocity coherence, find strong evidence members 456 common age (≃175 Myr), dynamical origin, formed chemically homogeneous prestellar material ([Fe/H] = −0.07 dex). Unlike well-known in Way, which its halo, is firmly part thin disk. If our conclusions about can be applied even small fraction remaining ≃8300 independent catalog, may ubiquitous. comment on implications this for nature star formation throughout Galaxy.

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ژورنال

عنوان ژورنال: The Astronomical Journal

سال: 2022

ISSN: ['1538-3881', '0004-6256']

DOI: https://doi.org/10.3847/1538-3881/ac6952