An application of the KNND method for detecting nearby open clusters based on Gaia-DR1

摘要

This paper presents a preliminary test of the k-th nearest neighbor distance (KNND) method for detecting nearby open clusters based on Gaia-DR1.We select 38 386 nearby stars (＜ 100 pc) from the Gaia-DR1 catalog,and then use the KNND method to detect overdense regions in three-dimensional space.We find two overdense regions (the Hyades and Coma Berenices (Coma Ber) open clusters),and obtain 57 reliable cluster members.Based on these cluster members,the distances to the Hyades and Coma Ber clusters are determined to be 46.0±0.2 and 83.5±0.3 pc,respectively.Our results demonstrate that the KNND method can be used to detect open clusters based on a large volume of astrometry data.