Bulg. J. Phys. vol.22 no.3-4 (1995), pp. 018-022

Morphology of the Globular Clusters in the Andromeda Galaxy

V. Golev1, A. Staneva1, N. Spassova2
1Department of Astronomy, Faculty of Physics, St. Kliment Ohridski University of Sofia, 5, James Bourchier Blvd., BG-1126 Sofia, Bulgaria
2Institute of Astronomy, Bulgarian Academy of Sciences, 72, Tsarigradsko Shose, BG-1784 Sofia, Bulgaria
Abstract. The projected ellipticities and orientations of I 73 globular clusters in the Andromeda galaxy were determined by using isodensity contours and 2D Gaussian fitting techniques. One to five B plates taken with the 2m Ritchey-Chretien-coudé reflector of the Bulgarian National Astronomical Observatory were digitized and processed for each cluster. The projected ellipticities of all examined up to no I 73 globular clusters lie in the range of 0.03 + 0.24 with mean value t = 0.086±0.038. It may be concluded that the most globular clusters in the Andromeda galaxy arc quite spherical. The derived orientations do not show preference with respect to the center of M 31 but a tend to align with the major axis of the galaxy. Some correlations of the ellipticity with other cluster's parameters are discused. The ellipticities determined in this paper are compared with those in other local group galaxies.

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