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- W3207953641 abstract "Recent analyses of the Gaia data have identified diffuse stellar populations surrounding nearby open clusters. It is important to verify that these halos, tails, and strings are of similar ages and compositions as stars in the denser part of the cluster. We present an analysis of NGC 2516 ($approx$150 Myr), which has a classical tidal radius of 10 pc and an apparent halo of stars spanning 500 pc ($20^circ$ on-sky). Combining photometry from Gaia, rotation periods from TESS, and lithium measurements from Gaia-ESO and GALAH, we find that the halo of NGC 2516 is the same age as the cluster's core. Two thirds of kinematically selected halo members out to 250 pc from the cluster center have rotation periods consistent with a gyrochronological age of 150 Myr. A comparison sample of field stars shows no such trend. The lithium abundances of stars in the halo are higher than in the field, and are correlated with the stellar rotation rate and binarity fraction, as has been noted in other young open clusters. Broadly speaking, this work supports a new paradigm wherein the halos of open clusters are often more populous than their cores. We highlight implications for spectroscopic survey targeting, open cluster dispersal, and planet searches around young stars." @default.
- W3207953641 created "2021-10-25" @default.
- W3207953641 creator A5033728206 @default.
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- W3207953641 creator A5066983847 @default.
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- W3207953641 creator A5074176372 @default.
- W3207953641 date "2021-10-14" @default.
- W3207953641 modified "2023-10-18" @default.
- W3207953641 title "Rotation and Lithium Confirmation of a 500 pc Halo for the Open Cluster NGC 2516*" @default.
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