Discovery of two nearby post-T Tauri stellar associations

Abstract

In this work we report the discovery of 2 new stellar associations in close vicinity of the Sun at roughly 180 and 150 pc. These two associations, named as u Tau assoc and e Tau assoc, were detected based on their clustering in a multi-dimensional parameter space including $\alpha$, $\delta$, ${\mu }_{\alpha }$ , ${\mu }_{\delta }$ and $\pi$ of Gaia. The fitting of pre-main-sequence model isochrones in their color-magnitude diagrams suggests that the two associations are of about 50 Myr old and the group members lower than $\sim$0.8 $M_{\odot }$ are at the stage of post-T Tauri.

arXiv comment13pages, 8 figures, 2 tables, accepted for publishing in AJ

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• Canis Major OB1 stellar groups contents revealed by Gaia
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