Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26as..133..387b&link_type=abstract
Astronomy and Astrophysics Supplement, v.133, p.387-394
Astronomy and Astrophysics
Astrophysics
9
Open Clusters, Ngc 1807, Ngc 1817, Astrometry
Scientific paper
Relative proper motions, their corresponding observed errors and membership probabilities of 722 stars in the old open cluster NGC 1817 region are determined from PDS measurements of 12 plate pairs. The plates have the maximum epoch difference of 81 years and were taken with the double astrograph at Zǒ-Sè station of Shanghai Observatory, which has an aperture of 40 cm, a focal length of 6.9 m and a plate scale of 30''/mm. The average proper motion accuracy is 1.6 mas/yr. These proper motions are used to determine the membership probabilities of stars in the region. The existence of two clusters in the region (NGC 1817, NGC 1807) is discussed. The number of stars with membership probability higher than 0.7 is 416 for NGC 1817 and 14 for NGC 1807. Table 5 is only available in electronic form from CDS via anonymous ftp 130.79.128.5, and by e-mail request to lbalague@pchpc3.am.ub.es
Balaguer-Nunez L.
Tian Kai-Ping
Zhao Jian-Ling
No associations
LandOfFree
Determination of proper motions and membership of the open clusters NGC 1817 and NGC 1807 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Determination of proper motions and membership of the open clusters NGC 1817 and NGC 1807, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Determination of proper motions and membership of the open clusters NGC 1817 and NGC 1807 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-992059