2013ApJ...768..158J


C.D.S. - SIMBAD4 rel 1.7 - 2021.05.06CEST00:41:12

2013ApJ...768..158J - Astrophys. J., 768, 158 (2013/May-2)

Binary frequencies in a sample of globular clusters. I. Methodology and initial results.

JI J. and BREGMAN J.N.

Abstract (from CDS):

Binary stars are thought to be a controlling factor in globular cluster evolution, since they can heat the environmental stars by converting their binding energy to kinetic energy during dynamical interactions. Through such interaction, the binaries determine the time until core collapse. To test predictions of this model, we have determined binary fractions for 35 clusters. Here we present our methodology with a representative globular cluster NGC 4590. We use Hubble Space Telescope archival Advanced Camera for Surveys data in the F606W and F814W bands and apply point-spread-function-fitting photometry to obtain high quality color-magnitude diagrams. We formulate the star superposition effect as a Poisson probability distribution function, with parameters optimized through Monte Carlo simulations. A model-independent binary fraction of (6.2 ±0.3)% is obtained by counting stars that extend to the red side of the residual color distribution after accounting for the photometric errors and the star superposition effect. A model-dependent binary fraction is obtained by constructing models with a known binary fraction and an assumed binary mass-ratio distribution function. This leads to a binary fraction range of 6.8%-10.8%, depending on the assumed shape to the binary mass-ratio distribution, with the best fit occurring for a binary distribution that favors low mass ratios (and higher binary fractions). We also represent the method for radial analysis of the binary fraction in the representative case of NGC 6981, which shows a decreasing trend for the binary fraction toward the outside, consistent with theoretical predictions for the dynamical effect on the binary fraction.

Abstract Copyright:

Journal keyword(s): binaries: general - globular clusters: general - Hertzsprung-Russell and C-M diagrams - surveys - techniques: photometric

Simbad objects: 36

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Number of rows : 36

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     ~ 3635 0
2 NGC 288 GlC 00 52 45.24 -26 34 57.4   10 8.13     ~ 950 0
3 NGC 362 GlC 01 03 14.26 -70 50 55.6     6.58     ~ 973 0
4 NGC 1851 GlC 05 14 06.76 -40 02 47.6   8.80 7.23     ~ 1279 0
5 NGC 2808 GlC 09 12 03.10 -64 51 48.6   7.77 5.69     ~ 1289 0
6 M 68 GlC 12 39 27.98 -26 44 38.6   10.26 7.96     ~ 905 0
7 NGC 5053 GlC 13 16 27.09 +17 42 00.9     9.96     ~ 554 0
8 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2310 0
9 NGC 5466 GlC 14 05 27.29 +28 32 04.0   10.5 9.70     ~ 748 0
10 NGC 5897 GlC 15 17 24.40 -21 00 36.4   10.16 8.52     ~ 349 0
11 M 5 GlC 15 18 33.22 +02 04 51.7   7.34 5.95     ~ 1814 0
12 NGC 5927 GlC 15 28 00.69 -50 40 22.9   10.13 8.86     ~ 417 0
13 M 80 GlC 16 17 02.41 -22 58 33.9           ~ 642 0
14 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1712 0
15 NGC 6101 GlC 16 25 48.12 -72 12 07.9   10.90 10.08     ~ 252 0
16 M 13 GlC 16 41 41.634 +36 27 40.75     5.8     ~ 2046 0
17 M 12 GlC 16 47 14.18 -01 56 54.7   8.52 6.07     ~ 599 0
18 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 1942 0
19 NGC 6352 GlC 17 25 29.11 -48 25 19.8   9.95 8.87     ~ 352 0
20 NGC 6362 GlC 17 31 54.99 -67 02 54.0   9.72 8.86     ~ 505 0
21 NGC 6397 GlC 17 40 42.09 -53 40 27.6   7.39 5.17     ~ 1831 1
22 NAME Galactic Center gam 17 45 39.60213 -29 00 22.0000           ~ 12154 0
23 NGC 6541 GlC 18 08 02.36 -43 42 53.6   8.06 7.32     ~ 336 1
24 NGC 6624 GlC 18 23 40.51 -30 21 39.7           ~ 798 1
25 M 69 GlC 18 31 23.10 -32 20 53.1   9.32 8.31     ~ 420 1
26 NGC 6652 GlC 18 35 45.63 -32 59 26.6   10.64 9.75     ~ 366 0
27 M 22 GlC 18 36 23.94 -23 54 17.1   7.16 6.17     ~ 1252 0
28 NGC 6723 GlC 18 59 33.15 -36 37 56.1           ~ 445 0
29 NGC 6752 GlC 19 10 52.11 -59 59 04.4   6.96 6.28     ~ 1847 0
30 Cl Terzan 7 GlC 19 17 43.92 -34 39 27.8           ~ 377 0
31 Cl Arp 2 GlC 19 28 44.11 -30 21 20.3     12.41     ~ 314 0
32 M 55 GlC 19 39 59.71 -30 57 53.1     6.49     ~ 780 0
33 M 72 GlC 20 53 27.70 -12 32 14.3   9.95 8.96     ~ 380 0
34 M 15 GlC 21 29 58.33 +12 10 01.2   3       ~ 2957 0
35 M 30 GlC 21 40 22.12 -23 10 47.5     7.10     ~ 946 0
36 Cl Pal 12 GlC 21 46 38.84 -21 15 09.4     11.89     ~ 465 0

    Equat.    Gal    SGal    Ecl

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2021.05.06-00:41:12

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