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Issue A&A
Volume 381, Number 2, January II 2002
Page(s) 464 - 471
Section Stellar clusters and associations
DOI http://dx.doi.org/10.1051/0004-6361:20011474



A&A 381, 464-471 (2002)
DOI: 10.1051/0004-6361:20011474

Determination of proper motions and membership of the open star cluster NGC 2548

Z. Y. Wu1, 2, 3, K. P. Tian1, 2, 3, L. Ba la guer- Nú ñez4, 1, C. Jor di4, 5, J. L. Zhao6, 1, 2, 3 and J. Guibert7

1  Shanghai Astronomical Observatory, CAS Shanghai 200030, PR China
2  Chinese National Observatories, CAS, PR China
3  Joint Lab of Optical Astronomy, CAS, PR China
4  Departament d'Astronomia i Mateorologia, Universitat de Barcelona, Avda. Diagonal 647, 08028 Barcelona, Spain
5  Institut d'Estudis Espacials de Catalunya IEEC, Edif. Nexus Gran Capità 24, 08034 Barcelona, Spain
6  CCAST (WORLD LABORATORY) PO Box 8730, Beijing 100080, PR China
7  Centre d'Analyse des Images, Observatoire de Paris, Bâtiment Perrault, 77 Av. Denfert-Rochereau, 75014 Paris, France

(Received 7 May 2001 / Accepted 18 October 2001)

Abstract
Absolute proper motions, their corresponding errors and membership probabilities of 501 stars in the intermediate-age open cluster NGC 2548 region are determined from MAMA measurements of 10 photographic plates. The plates have the maximum epoch difference of 82 years and they were taken with the double astrograph at Zô-Sè station of Shanghai Observatory, which has an aperture of 40 cm and a plate scale of 30´´ mm -1. The average proper motion precision is 1.18 mas yr -1. These proper motions are used to determine the membership probabilities of stars in the region. The number of stars with membership probabilities higher than 0.7 is 165.


Key words: galaxy: open clusters and associations: individual: NGC 2548 -- astrometry -- galaxy: kinematics and dynamics

Offprint request: L. Balaguer-Núñez, Lola.Balaguer@am.ub.es

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