Issue |
Astron. Astrophys. Suppl. Ser.
Volume 116, Number 3, May 1 1996
|
|
---|---|---|
Page(s) | 447 - 461 | |
DOI | https://doi.org/10.1051/aas:1996127 | |
Published online | 15 May 1996 |
The ellipticities of globular clusters in the Andromeda galaxy
1
Department of Astronomy, Faculty of Physics, St. Kliment Okhridski University of Sofia, 5 James Bourchier street, BG-1126 Sofia, Bulgaria
2
Institute of Astronomy, Bulgarian Academy of Sciences, 72 Tsarigradsko chauss$\acute{\rm e}$e, BG-1784 Sofia, Bulgaria
Send offprint request to: A. Staneva
Received:
15
March
1995
Accepted:
4
October
1995
The projected ellipticities and orientations of 173 globular clusters in the
Andromeda galaxy have been determined by using isodensity contours and 2D
Gaussian fitting techniques. A number of B plates taken with the 2 m
Ritchey-Chretien-coud reflector of the Bulgarian National
Astronomical Observatory
were digitized and processed for each cluster.
The derived ellipticities and orientations are presented in the
form of a
catalogue.
The projected ellipticities of M 31 GCs lie between
with mean value
. It may be
concluded that the most globular clusters in the Andromeda galaxy are quite
spherical. The derived orientations do not show a preference with respect to
the center of M 31.
Some correlations of the ellipticity with other clusters parameters are
discussed. The ellipticities determined in this work are compared with those
in other Local Group galaxies.
Key words: globular clusters: general / galaxies: individual: M 31 / galaxies: star clusters / catalogs
© European Southern Observatory (ESO), 1996