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A Space Motion Study of the Globular Cluster M13

Published online by Cambridge University Press:  03 August 2017

L. Chen ,
J.J. Wang  and
J.L. Zhao
L. Chen
Affiliation:
Shanghai Astronomical Observatory, CAS, Shanghai 200030, P.R. China Chinese National Observatories, CAS, Beijing 100012, P.R. China
J.J. Wang
Affiliation:
Shanghai Astronomical Observatory, CAS, Shanghai 200030, P.R. China Chinese National Observatories, CAS, Beijing 100012, P.R. China
J.L. Zhao
Affiliation:
Shanghai Astronomical Observatory, CAS, Shanghai 200030, P.R. China Chinese National Observatories, CAS, Beijing 100012, P.R. China

Abstract

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Positions and absolute proper motions of 264 stars in the field of about 70′ × 70′ around the globular cluster M13 were determined. In the astrometric reduction, three early and three late epoch plates taken with the 40cm refractor at Shensan, Shanghai, China, were used, with the time baseline of 73 years. The reduction was done using the central overlapping algorithm, with 5 Hipparcos stars and 38 Tycho-2 stars used as reference stars. Based on the reduced proper motion data, the membership probabilities of the sample stars were determined. An absolute proper motion of the cluster of 1.49 ± 0.36 mas yr−1 in right ascension and 3.06±0.35 mas yr−1 in declination was obtained. From this proper motion, together with distance and radial velocity data, we derived the space motion of M13 and via numerical integration also the orbit of the cluster in the Galaxy.

Type
Part 1. The Star Clusters of Local Group Galaxies
Information
Symposium - International Astronomical Union , Volume 207: Extragalactic Star Clusters , 2002 , pp. 119 - 121
Copyright
Copyright © Astronomical Society of the Pacific 2002 

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