2008A&A...481..701S


C.D.S. - SIMBAD4 rel 1.7 - 2021.05.17CEST03:50:08

2008A&A...481..701S - Astronomy and Astrophysics, volume 481, 701-704 (2008/4-3)

The correlation between blue straggler and binary fractions in the core of Galactic globular clusters.

SOLLIMA A., LANZONI B., BECCARI G., FERRARO F.R. and FUSI PECCI F.

Abstract (from CDS):

Blue stragglers stars (BSSs) are thought to form in globular clusters by two main formation channels: i) mergers induced by stellar collisions; and ii) coalescence or mass transfer between companions in binary systems. The detailed study of the BSS properties is therefore crucial for understanding the binary evolution mechanisms and the complex interplay between dynamics and stellar evolution in dense stellar systems. We present the first comparison between the BSS specific frequency and the binary fraction in the core of a sample of Galactic globular clusters, with the aim of investigating the relative efficiency of the two proposed formation mechanisms. We derived the frequency of BSSs in the core of thirteen low-density Galactic globular clusters by using deep ACSST observations and investigated its correlation with the binary fraction and various other cluster parameters. We observed a correlation between the BSS specific frequency and the binary fraction. The significance of the correlation increases by including a further dependence on the cluster's central velocity dispersion. We conclude that the unperturbed evolution of primordial binaries could be the dominant BSS formation process, at least in low-density environments.

Abstract Copyright:

Journal keyword(s): techniques: photometric - binaries: general - blue stragglers - stars: population II - globular clusters: general

Simbad objects: 16

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Number of rows : 16

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NGC 104 GlC 00 24 05.359 -72 04 53.20   5.78 4.09     ~ 3637 0
2 NGC 288 GlC 00 52 45.24 -26 34 57.4   10 8.13     ~ 951 0
3 NAME Sgr Stream St* 02 22 +00.0           ~ 697 0
4 M 68 GlC 12 39 27.98 -26 44 38.6   10.26 7.96     ~ 906 0
5 NGC 5053 GlC 13 16 27.09 +17 42 00.9     9.96     ~ 554 0
6 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2313 0
7 NGC 5466 GlC 14 05 27.29 +28 32 04.0   10.5 9.70     ~ 749 0
8 NGC 5897 GlC 15 17 24.40 -21 00 36.4   10.16 8.52     ~ 349 0
9 UGC 10310 IG 16 16 17.9040378078 +47 02 43.158504118   14.9       ~ 129 0
10 NGC 6101 GlC 16 25 48.12 -72 12 07.9   10.90 10.08     ~ 252 0
11 NGC 6362 GlC 17 31 54.99 -67 02 54.0   9.72 8.86     ~ 506 0
12 NGC 6723 GlC 18 59 33.15 -36 37 56.1           ~ 446 0
13 Cl Terzan 7 GlC 19 17 43.92 -34 39 27.8           ~ 377 0
14 M 55 GlC 19 39 59.71 -30 57 53.1     6.49     ~ 780 0
15 M 72 GlC 20 53 27.70 -12 32 14.3   9.95 8.96     ~ 380 0
16 Cl Pal 12 GlC 21 46 38.84 -21 15 09.4     11.89     ~ 465 0

    Equat.    Gal    SGal    Ecl

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2021.05.17-03:50:08

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