The old moving groups in the field of Taurus

TL;DR

This study systematically identifies and characterizes stellar groups in the Taurus region using Gaia DR2 data and clustering algorithms, revealing new groups, disk-bearing stars, and kinematic relations among them.

Contribution

Introduces a new catalog of 22 stellar groups in Taurus, including 14 previously unrecognized, with detailed analysis of their ages, disk properties, and kinematic relations.

Findings

Identified 22 stellar groups in Taurus, including 14 new groups.

Discovered 19 new disk-bearing stars, 8 in young groups and 11 in older groups.

Found a kinematic link between Group 9 and known Taurus members.

Abstract

In this work, we present a systematic search for stellar groups in the Taurus field by applying DBSCAN algorithm to the data from Gaia DR2. We find 22 groups, consisting of 8 young groups (Groups 1-8) at ages of 2-4Myr and distances of ~130-170pc, 14 old groups (Groups 9-22) at ages of 8-49Myr and distances of ~110-210pc. We characterize the disk properties of group members and find 19 new disk-bearing stars, 8 of which are in the young groups and 11 others belong to the comparatively old groups at ages of 8-11 Myr. We characterize the accretion properties of the group members with H$\alpha$ emission line in their LAMOST spectra, and discover one source in Group 10 at an age of 10 Myr which still shows accretion activity. We investigate the kinematic relations among the old groups, and find that Group 9 is kinematically related to the known Taurus members and exclude any kinematic relations between Groups 10-22 and the known Taurus members.