J/A+AS/116/447 M31 globulars clusters ellipticities (Staneva+, 1996)
The ellipticities of globular clusters in the Andromeda Galaxy.
Staneva A., Spassova N., Golev V.
<Astron. Astrophys. Suppl. Ser. 116, 447 (1996)>
=1996A&AS..116..447S 1996A&AS..116..447S (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, globular ;
Keywords: globular clusters: general - galaxies: individual: M31 -
galaxies: star clusters - catalogs
Description:
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 2m Ritchey-Chretien-coude 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 0.03/0.24 with mean value ε=0.086±0.038. 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
Objects:
----------------------------------------------------------------------------
RA (2000) DE Name
----------------------------------------------------------------------------
00 42.7 +41 16 M 31
----------------------------------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1 41 173 Morphological parameters of M31 globulars
table2 68 13 Comparison of the ellipticities of globulars in
M31, Milky Way Galaxy, and Magellanic Clouds
table3 41 24 Comparison of the ellipticities with the data
of other authors
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table1
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
2- 6 A5 --- Name Clusters' name from Sargent et al.(1977) or
Battistini et al.(1987)
8- 12 F5.3 --- Eps Mean ellipticity
15- 19 F5.3 --- e_Eps Final rms uncertainty in ellipticity
22- 24 I3 deg PA []? Position angle of the major axis measured
from north toward east
27- 28 I2 deg e_PA []? Final rms uncertainty in position angle
31 I1 --- Mes Number of measurements
34- 36 A3 --- Method Reduction method (I for isodensity analysis
and D for 2D Gaussian)
39- 41 F3.1 arcsec a Apparent angular size of the major axis
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table2
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
2- 14 A13 --- Name Name of the galaxy
17- 20 F4.2 --- Eps Mean ellipticity
23- 26 F4.2 --- e_Eps rms uncertainty in ellipticity
28- 30 I3 --- Nobj Number of objects in the sample
33- 36 F4.2 --- l(Eps) Ellipticity range - lower limit
39- 42 F4.2 --- u(Eps) Ellipticity range - upper limit
45- 68 A24 --- Source Source
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table3
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
2- 6 A5 --- Name Clusters' name after Sargent et al. (1977)
8- 11 A4 --- EpsA1 Annulus A ellipticity, Davoust & Prugniel (1990)
14- 17 A4 --- EpsB1 Annulus B ellipticity, Davoust & Prugniel (1990)
20- 23 A4 --- EpsA2 Annulus A ellipticity, Lupton (1989)
26- 29 A4 --- EpsB2 Annulus B ellipticity, Lupton (1989)
32- 35 F4.2 --- Eps Ellipticity from this work
38- 41 F4.2 arcsec Rad Radius
--------------------------------------------------------------------------------
References:
Battistini P., Bonoli F., Braccesi A., Federici L., Fusi-Pecci F., Marano B.,
Borngen F., 1987, A&A Suppl.Ser. 67, 447 =1987A&AS...67..447B 1987A&AS...67..447B
Davoust E., Prugniel P., 1990, A&A 230, 67 =1990A&A...230...67D 1990A&A...230...67D
Frenk C.S., Fall S.M., 1982, MNRAS 199, 565 =1982MNRAS.199..565F 1982MNRAS.199..565F
Geisler D., Hodge P., 1980, ApJ 242, 66 =1980ApJ...242...66G 1980ApJ...242...66G
Geyer E., Richthler T., 1981, in: Davis Philip A.G., Hayes D.S. (eds.)
IAU Coll.68, p.239
Geyer E., Hopp U., Nelles B., 1983, A&A 125, 359 =1983A&A...125..359G 1983A&A...125..359G
Kontizas E., Kontizas M., Sedmak J., Smaleglia R., 1989, AJ 98, 590
=1989AJ.....98..590K 1989AJ.....98..590K
Kontizas E., Kontizas M., Sedmak G., Smareglia R., Dapergolas A.,
1990, AJ 100, 425 =1990AJ....100..425K 1990AJ....100..425K
Lupton R., 1989, AJ 97, 1350 =1989AJ.....97.1350L 1989AJ.....97.1350L
Sargent W.L.W., Kowal C.T., Hartwick F.D.A., van den Bergh S.,
1977, AJ 82, 947 =1977AJ.....82..947S 1977AJ.....82..947S
White R.E., Shawl S.J., 1987, ApJ 317, 246 =1987ApJ...317..246W 1987ApJ...317..246W
--------------------------------------------------------------------------------
(End) Patricia Bauer [CDS] 08-Feb-1996