New open clusters found by manual mining of data based on Gaia DR2  

作　　者：Juan Casado 

机构地区：[1]Facultad de Ciencias,Universidad Autnoma de Barcelona,08193,Bellaterra,Catalonia,Spain

出　　处：《Research in Astronomy and Astrophysics》2021年第5期147-154,共8页天文和天体物理学研究（英文版）

基　　金：Funding for the DPAC has been provided by national institutions,in particular the institutions participating in the Gaia Multilateral Agreement.This research has made use of the VizieR catalogue access tool,CDS,Strasbourg,France(DOI:10.26093/cds/vizier).

摘　　要：The physical nature of a series of 20 new open clusters is confirmed employing existing data on putative star members,mainly from the second Gaia Data Release(DR2).The clusters were discovered as overdensities of stars by visual inspection of either photographic DSS plates or proper motion plots of random source fields.The reported objects are not present in the most comprehensive or recent catalogs of stellar clusters and associations.For all of them,clumps of comoving stars are revealed in the proper motion space.The parallaxes of the clumped stars are compatible with the real existence of open clusters over narrow ranges of distances.Surface density calculations,free of most noise from non-member sources,allow differentiating a cluster core and an extended cluster corona in some instances.Color-magnitude diagrams generally show a definite main sequence that allows confirmation of the physical existence of the clusters and some of their characteristics.Two of the new clusters seem to form a double system with a common origin.Several of the new clusters challenge the claim of near completeness of the known OC population in the distance range from 1.0 to 1.8 kpc from the Sun(Kharchenko et al.).

关 键 词：astronomical databases:miscellaneous parallaxes proper motions(stars:)Hertzsprung-Russell CCM diagrams(Galaxy:)open clusters associations:individual 

分 类 号：P152[天文地球—天文学]