Extended stellar systems in the solar neighborhood.

Author(s)
Verena Fürnkranz, Stefan Meingast, João Alves
Abstract

We report the discovery of a kinematically cold group of stars, located

in the immediate neighborhood of the well-known star cluster Coma

Berenices (Mel 111). The new group identified in tangential velocity

space as measured by Gaia contains at least 177 coeval members

distributed in two subgroups, and appears as a flattened structure

parallel to the plane, stretching for about 50 pc. More remarkably, the

new group, which appears to have formed about 300 Myr later than Mel 111

in a different part of the Galaxy, will share essentially the same

volume with the older cluster when the centers of both groups will be at

their closest in 13 Myr. This will result in the mixing of two unrelated

populations with different metallicities. The phase of cohabitation for

these two groups is about 20-30 Myr, after which the two populations

will drift apart. We estimate that temporal cohabitation of such

populations is not a rare event in the disk of the Milky Way, and of the

order of once per Galactic revolution. Our study also unveils the tidal

tails of the Mel 111 cluster.

 

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Organisation(s)
Dean's office of the Faculty of Earth Sciences, Geography and Astronomy, Department of Astrophysics, Research Platform Data Science @ Uni Vienna
Journal
Astronomy & Astrophysics
Volume
624
No. of pages
7
ISSN
0004-6361
DOI
https://doi.org/10.1051/0004-6361/201935293
Publication date
04-2019
Publication status
Published
Peer reviewed
Yes
Austrian Fields of Science 2012
103003 Astronomy
Keywords
stars: kinematics and dynamics, solar neighborhood, open clusters and associations: individual: Coma Berenices
Portal url
https://ucris.univie.ac.at/portal/en/publications/extended-stellar-systems-in-the-solar-neighborhood(35706e14-2401-49d5-8680-ef5e84501b83).html