2012MNRAS.421..960S

Query : 2012MNRAS.421..960S

2012MNRAS.421..960S - Mon. Not. R. Astron. Soc., 421, 960-970 (2012/April-1)

Structural parameters and blue stragglers in Sagittarius dwarf spheroidal galaxy globular clusters.

SALINAS R., JILKOVA L., CARRARO G., CATELAN M. and AMIGO P.

Abstract (from CDS):

We present BV photometry of four Sagittarius dwarf spheroidal galaxy globular clusters: Arp 2, NGC 5634, Palomar 12 and Terzan 8, obtained with the Danish Telescope at ESO La Silla. We measure the structural parameters of the clusters using a King profile fitting, obtaining the first reliable measurements of the tidal radius of Arp 2 and Terzan 8. These two clusters are remarkably extended and with low concentrations; with a concentration of only c= 0.41±0.02, Terzan 8 is less concentrated than any cluster in our Galaxy.

Blue stragglers are identified in the four clusters, and their spatial distribution is compared to those of horizontal branch and red giant branch stars. The blue straggler properties do not provide evidence of mass segregation in Terzan 8, while Arp 2 probably shares the same status, although with less confidence. In the case of NGC 5634 and Palomar 12, blue stragglers are significantly less populous, and their analysis suggests that the two clusters have probably undergone mass segregation.


Abstract Copyright: 2012 The Authors Monthly Notices of the Royal Astronomical Society2012 RAS

Journal keyword(s): blue stragglers - globular clusters: general - globular clusters: individual: Arp 2 - globular clusters: individual: Terzan 8 - globular clusters: individual: NGC 5634 - globular clusters: individual: Palomar 12

Simbad objects: 19

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Number of rows : 19
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 NAME Sagittarius Stream St* 02 22 +00.0           ~ 874 0
2 NAME Fornax Dwarf Spheroidal G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1743 1
3 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7066 0
4 NGC 2419 GlC 07 38 08.51 +38 52 54.9     10.05     ~ 932 0
5 NAME E 3 GlC 09 20 57.07 -77 16 54.8           ~ 164 0
6 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3427 0
7 NGC 5634 GlC 14 29 37.28 -05 58 35.1   10.69 10.05     ~ 300 0
8 NAME Serpens Dwarf GlC 15 16 05.30 -00 06 41.0   15.1       ~ 734 1
9 GCl 38 GlC 16 10 59.00 +14 57 42.0           ~ 368 0
10 GCl 50 GlC 16 59 51.1 -00 32 00   15.70       ~ 200 1
11 M 54 GlC 18 55 03.33 -30 28 47.5           ~ 1069 0
12 NAME SDG G 18 55 19.0 -30 32 43   4.5 3.6     ~ 2187 2
13 Cl Terzan 7 GlC 19 17 43.92 -34 39 27.8           ~ 428 0
14 Cl Arp 2 GlC 19 28 44.11 -30 21 20.3     12.41     ~ 354 0
15 Cl Terzan 8 GlC 19 41 44.41 -33 59 58.1     11.54     ~ 321 0
16 Cl Pal 12 GlC 21 46 38.84 -21 15 09.4     11.89     ~ 516 0
17 GCl 124 GlC 23 06 44.48 +12 46 19.2   15.6       ~ 277 1
18 NAME Galactic Bulge reg ~ ~           ~ 4299 0
19 NAME Local Group GrG ~ ~           ~ 8391 0

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