SIMBAD references

1995A&AS..113..419W - Astron. Astrophys., Suppl. Ser., 113, 419-430 (1995/November-1)

High-precision study of proper motions and membership of 924 stars in the central region of Praesepe.


Abstract (from CDS):

High-precision proper motions for 257 and 296 stars in a 90x90' region centered on BD+20 2170 were obtained from seven plates taken with the 40cm refractor (f=6895mm) at Zo-Se station of Shanghai Observatory with six AC plates and the stellar positions in Russell's (1976, Ph.D. Thesis, University of Pittsburgh) catalogue, respectively. Combining with the data given by Klein-Wassink (=1927PGro...41....1K), Jones (1971), Artyukhina (=1971SoSht.172....3A), and Jones & Cudworth (=1983AJ.....88..215J), these proper motions give a sample of 924 stars in the region mentioned above. With membership probabilities estimated by an improved maximum likelihood method, a very good sample of 198 members is obtained with proper motion accuracies ranging from ±0.2 to ±5.0mas/yr, of which 60 per cent are better than ±1.0mas/yr, and the completeness nearly down to B=15.5.

Abstract Copyright:

Journal keyword(s): astrometry - open clusters, individual: Praesepe Cluster

VizieR on-line data: <Available at CDS (J/A+AS/113/419): table8>

Nomenclature: Table 8, col(1): Cl* NGC 2632 WJJP NNN (Nos 258-924) added.

Simbad objects: 933

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