207 new open star clusters within 1 kpc from gaia data release 2

• DOI: 10.5303/jkas.2019.52.5.145
• Publication Date: 2019-01-01
• Authors: Seunghyeon Kim; Hong Bae Ann; Sang Hyun Lee; Gyuheon Sim
• Keywords: Astrophysics - Solar and Stellar Astrophysics; Astrophysics of Galaxies (astro-ph.GA); 0103 physical sciences; FOS: Physical sciences; Astrophysics - Astrophysics of Galaxies; 01 natural sciences; Solar and Stellar Astrophysics (astro-ph.SR)

We conducted a survey of open clusters within 1 kpc from the Sun using the astrometric and photometric data of the Gaia Data Release 2. We found 655 cluster candidates by visual inspection of the stellar distributions in proper motion space and spatial distributions in l-b space. All of the 655 cluster candidates have a well defined main-sequence except for two candidates if we consider that the main sequence of very young clusters is somewhat broad due to differential extinction. Cross-matching of our 653 open clusters with known open clusters in various catalogs resulted in 207 new open clusters. We present the physical properties of the newly discovered open clusters. The majority of the newly discovered open clusters are of young to intermediate age and have less than ~50 member stars.