2012A&A...540A..16M

Query : 2012A&A...540A..16M

2012A&A...540A..16M - Astronomy and Astrophysics, volume 540A, 16-16 (2012/4-1)

The ACS survey of galactic Globular clusters. XII. Photometric binaries along the main sequence.

MILONE A.P., PIOTTO G., BEDIN L.R., APARICIO A., ANDERSON J., SARAJEDINI A., MARINO A.F., MORETTI A., DAVIES M.B., CHABOYER B., DOTTER A., HEMPEL M., MARIN-FRANCH A., MAJEWSKI S., PAUST N.E.Q., REID I.N., ROSENBERG A. and SIEGEL M.

Abstract (from CDS):

The fraction of binary stars is an important ingredient to interpret globular cluster dynamical evolution and their stellar population. We investigate the properties of main-sequence binaries measured in a uniform photometric sample of 59 Galactic globular clusters that were observed by HST WFC/ACS as a part of the Globular Cluster Treasury project. We measured the fraction of binaries and the distribution of mass-ratio as a function of radial location within the cluster, from the central core to beyond the half-mass radius. We studied the radial distribution of binary stars, and the distribution of stellar mass ratios. We investigated monovariate relations between the fraction of binaries and the main parameters of their host clusters. We found that in nearly all the clusters, the total fraction of binaries is significantly smaller than the fraction of binaries in the field, with a few exceptions only. Binary stars are significantly more centrally concentrated than single MS stars in most of the clusters studied in this paper. The distribution of the mass ratio is generally flat (for mass-ratio parameter q>0.5). We found a significant anti-correlation between the binary fraction in a cluster and its absolute luminosity (mass). Some, less significant correlation with the collisional parameter, the central stellar density, and the central velocity dispersion are present. There is no statistically significant relation between the binary fraction and other cluster parameters. We confirm the correlation between the binary fraction and the fraction of blue stragglers in the cluster.

Abstract Copyright: ∼

Journal keyword(s): techniques: photometric - binaries: general - stars: Population II - globular clusters: general

Simbad objects: 69

Full paper

View the references in ADS

Number of rows : 69

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag B	Mag V	Sp type	#ref 1850 - 2023	#notes
1	NGC 104	GlC	00 24 05.359	-72 04 53.20		4.09	~	3841	0
2	NGC 288	GlC	00 52 45.24	-26 34 57.4	10	8.13	~	1025	0
3	NGC 362	GlC	01 03 14.26	-70 50 55.6		6.58	~	1056	0
4	NGC 1261	GlC	03 12 16.21	-55 12 58.4		8.63	~	505	0
5	Cl Pal 1	GlC	03 33 20.04	+79 34 51.8	17.2		~	237	1
6	Cl Pal 2	GlC	04 46 05.91	+31 22 53.4	15		~	172	0
7	NGC 1851	GlC	05 14 06.76	-40 02 47.6			~	1399	0
8	NGC 2298	GlC	06 48 59.41	-36 00 19.1		8.89	~	485	0
9	NGC 2808	GlC	09 12 03.10	-64 51 48.6			~	1394	0
10	NAME E 3	GlC	09 20 57.07	-77 16 54.8			~	161	0
11	NGC 3201	GlC	10 17 36.82	-46 24 44.9			~	855	0
12	NGC 4147	GlC	12 10 06.149	+18 32 31.78	11.45	10.74	~	559	0
13	M 68	GlC	12 39 27.98	-26 44 38.6		7.96	~	973	0
14	NGC 4833	GlC	12 59 33.92	-70 52 35.4			~	411	0
15	M 53	GlC	13 12 55.25	+18 10 05.4		7.79	~	820	0
16	NGC 5053	GlC	13 16 27.09	+17 42 00.9		9.96	~	610	0
17	NGC 5139	GlC	13 26 47.28	-47 28 46.1			~	3363	0
18	M 3	GlC	13 42 11.62	+28 22 38.2		6.39	~	2449	0
19	NGC 5286	GlC	13 46 26.81	-51 22 27.3			~	429	0
20	NGC 5466	GlC	14 05 27.29	+28 32 04.0		9.70	~	816	0
21	NGC 5897	GlC	15 17 24.40	-21 00 36.4	10.16	8.52	~	377	0
22	M 5	GlC	15 18 33.22	+02 04 51.7		5.95	~	1945	0
23	NGC 5927	GlC	15 28 00.69	-50 40 22.9			~	447	0
24	NGC 5986	GlC	15 46 03.00	-37 47 11.1		6.92	~	358	0
25	Cl Lynga 7	OpC	16 11 03.65	-55 19 04.0			~	108	0
26	M 80	GlC	16 17 02.41	-22 58 33.9			~	697	0
27	M 4	GlC	16 23 35.22	-26 31 32.7			~	1817	0
28	NGC 6101	GlC	16 25 48.12	-72 12 07.9			~	284	0
29	NGC 6144	GlC	16 27 13.86	-26 01 24.6			~	236	0
30	M 107	GlC	16 32 31.86	-13 03 13.6			~	770	0
31	M 13	GlC	16 41 41.634	+36 27 40.75		5.8	~	2168	0
32	M 12	GlC	16 47 14.18	-01 56 54.7		6.07	~	657	0
33	M 10	GlC	16 57 09.05	-04 06 01.1		4.98	~	770	0
34	NGC 6304	GlC	17 14 32.25	-29 27 43.3			~	343	0
35	M 92	GlC	17 17 07.39	+43 08 09.4		6.52	~	2072	0
36	NGC 6352	GlC	17 25 29.11	-48 25 19.8			~	384	0
37	NGC 6366	GlC	17 27 44.24	-05 04 47.5			~	300	0
38	NGC 6362	GlC	17 31 54.99	-67 02 54.0			~	568	0
39	NGC 6388	GlC	17 36 17.461	-44 44 08.34	7.40		~	891	1
40	NGC 6397	GlC	17 40 42.09	-53 40 27.6		5.17	~	1940	0
41	NGC 6441	GlC	17 50 13.06	-37 03 05.2			~	867	0
42	NGC 6496	GlC	17 59 03.68	-44 15 57.4	9.96		~	216	0
43	NGC 6535	GlC	18 03 50.51	-00 17 51.5		9.85	~	286	0
44	NGC 6541	GlC	18 08 02.36	-43 42 53.6			~	363	0
45	NGC 6584	GlC	18 18 37.60	-52 12 56.8		8.17	~	279	0
46	NGC 6624	GlC	18 23 40.51	-30 21 39.7			~	862	1
47	M 28	GlC	18 24 32.89	-24 52 11.4			~	750	0
48	M 69	GlC	18 31 23.10	-32 20 53.1			~	451	0
49	NGC 6652	GlC	18 35 45.63	-32 59 26.6			~	416	0
50	M 22	GlC	18 36 23.94	-23 54 17.1			~	1348	0
51	M 70	GlC	18 43 12.76	-32 17 31.6			~	374	0
52	M 54	GlC	18 55 03.33	-30 28 47.5			~	1046	0
53	NGC 6717	GlC	18 55 06.04	-22 42 05.3			~	233	0
54	NGC 6723	GlC	18 59 33.15	-36 37 56.1			~	484	0
55	NGC 6752	GlC	19 10 52.11	-59 59 04.4			~	1964	0
56	M 56	GlC	19 16 35.57	+30 11 00.5			~	409	0
57	Cl Terzan 7	GlC	19 17 43.92	-34 39 27.8			~	420	0
58	NGC 6792	G	19 20 57.394	+43 07 56.57	13.4		~	48	0
59	Cl Arp 2	GlC	19 28 44.11	-30 21 20.3		12.41	~	347	0
60	M 55	GlC	19 39 59.71	-30 57 53.1		6.49	~	836	0
61	Cl Terzan 8	GlC	19 41 44.41	-33 59 58.1		11.54	~	312	0
62	M 71	GlC	19 53 46.49	+18 46 45.1			~	1107	0
63	NGC 6934	GlC	20 34 11.37	+07 24 16.1			~	411	0
64	M 72	GlC	20 53 27.70	-12 32 14.3		8.96	~	417	0
65	M 15	GlC	21 29 58.33	+12 10 01.2			~	3103	0
66	M 2	GlC	21 33 27.02	-00 49 23.7		6.25	~	1012	1
67	M 30	GlC	21 40 22.12	-23 10 47.5		7.10	~	1024	0
68	Cl Pal 12	GlC	21 46 38.84	-21 15 09.4		11.89	~	510	0
69	GCl 124	GlC	23 06 44.48	+12 46 19.2	15.6		~	267	1

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