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Title:
Proper motion of the Large Magellanic Cloud and the mass of the galaxy. 1: Observational results
Authors:
Jones, B. F.; Klemola, A. R.; Lin, D. N. C.
Affiliation:
AA(Univ. of California, Santa Cruz, CA, US), AB(Univ. of California, Santa Cruz, CA, US), AC(Univ. of California, Santa Cruz, CA, US)
Publication:
The Astronomical Journal, vol. 107, no. 4, p. 1333-1337 (AJ Homepage)
Publication Date:
04/1994
Category:
Astronomy
Origin:
STI
NASA/STI Keywords:
APPLICATIONS OF MATHEMATICS, DATA REDUCTION, GALACTIC HALOS, GLOBULAR CLUSTERS, MAGELLANIC CLOUDS, VARIABLE MASS SYSTEMS, CHARGE COUPLED DEVICES, PHOTOGRAMMETRY, RADIAL VELOCITY
DOI:
10.1086/116947
Bibliographic Code:
1994AJ....107.1333J

Abstract

We have measured the proper motion of the Large Magellanic Cloud (LMC) using 21 plates taken with the Cerro-Tololo Inter-American Observatory (CTIO) 4 m telescope and covering an epoch span of 14 yr. The plates were centered on the globular cluster NGC 2257, lying on the northeast periphery of the Cloud. Proper motions were determined for 251 LMC members, chosen on the basis of the photometry of Stryker (1984), using 92 galaxies as a reference frame. The measured mean absolute proper motion of the LMC stars in our region is mualpha = 0.120 sec +/- 0.028 sec century-1, mudelta=0.026 sec +/- 0.027 sec century-1. After correcting for the rotation of the LMC and the effects of solar motion, this proper motion combined with the radial velocity of the LMC implies a galactocentric coordinate radial velocity for the Cloud of 48 +/- 41 km s-1 and a total galactocentric transverse velocity of 215 +/- 48 km s-1.

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