2000A&A...358..910V

Query : 2000A&A...358..910V

2000A&A...358..910V - Astronomy and Astrophysics, volume 358, 910-922 (2000/6-3)

Multiple and variable X-ray sources in the globular clusters ω Cen, NGC 6397, NGC 6752, and Liller 1.

VERBUNT F. and JOHNSTON H.M.

Abstract (from CDS):

We detect stars from the Hipparcos and Tycho Catalogues in the field of view of observations with the ROSAT HRI of three globular clusters. We use the positions of these stars to reduce the systematic error in the positions of X-ray sources in the clusters to ∼2'' for ω Cen and NGC 6752, and 1'' for NGC 6397. We detect three X-ray sources in the core of ω Cen, and four in the core of NGC 6752; the data for the center of NGC 6397 may be fitted with five or six sources. Outside the cores, but within the half-mass radius of the clusters, we detect two sources in ω Cen, one in NGC 6397 and two in NGC 6752; these may or may not be cluster members. A ROSAT HRI observation of Liller1 does not detect a low-luminosity source, at a limit below a detection with ASCA. We discuss the nature of the low-luminosity X-ray sources in globular clusters in the light of these new results.

Abstract Copyright: ∼

Journal keyword(s): Galaxy: globular clusters: individual: ω Cen, NGC 6397, NGC 6752, Liller 1 - X-rays: stars

Nomenclature: Table 2: [JVH94] NGC 5139 NNa (Nos 9a-9b, 18-21) added. Table 3: [JVH94] NGC 6397 NNa (Nos 4a-4e, 11-19) added. Table 6: [JVH94] NGC 6752 NNa (Nos 7a-7b, 13-22) added.

Simbad objects: 71

View the references in ADS

Number of rows : 71

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2022	#notes
1	RX J0021.8-7221	CV*	00 24 04.263	-72 04 57.97	18.868		19.772		19.316	~	59	0
2	NGC 104	GlC	00 24 05.359	-72 04 53.20		5.78	4.09			~	3722	0
3	Cl* NGC 104 MAM M54898	CV*	00 24 06.013	-72 04 56.20	19.383		20.411		19.273	~	32	0
4	HD 17925	RS*	02 52 32.1281856011	-12 46 10.968056223	7.48	6.91	6.05	5.34	4.89	K1V	486	0
5	2MASS J13255214-4719085	Y*?	13 25 52.1440450344	-47 19 08.487218676	16.877	16.295	14.764		12.296	~	11	0
6	[GBW2003] 10	X	13 26 11.4	-47 37 11						~	3	0
7	2E 3049	X	13 26 19.796	-47 29 10.51		26.8		25.3		~	20	0
8	2XMM J132625.1-473227	AG?	13 26 25.14	-47 32 27.4						~	7	0
9	HD 116789	*	13 26 46.3304474544	-47 19 46.052982804		8.52	8.43			A0V	14	0
10	NGC 5139	GlC	13 26 47.28	-47 28 46.1		6.12	5.33			~	3231	0
11	[RBB2002b] 18	X	13 26 48.651	-47 27 44.82		22.3		21.3		~	5	0
12	2E 1323.8-4713	X	13 26 48.656	-47 27 44.88						~	8	0
13	[GBW2003] 9	X	13 26 48.731	-47 31 25.28		22.2		21.7		~	6	0
14	[CCG2000] Star A	CV*	13 26 52.135	-47 29 35.63		21.6		20.9		~	11	0
15	[JVH94] NGC 5139 9	X	13 26 52.8	-47 29 10						~	4	0
16	[CCG2000] Star B	CV*	13 26 53.513	-47 29 00.38		21.1		20.0		~	11	0
17	Cl* NGC 5139 SAW V208	EB*	13 27 10.524	-47 26 07.40	17.635	17.532	17.285	17.094	16.720	~	8	0
18	[GBW2003] 18	X	13 27 21.200	-47 23 23.73						~	4	0
19	NGC 5139 6221	Y*?	13 27 27.6571684512	-47 19 07.636014300	17.018	16.220	14.654	14.46	11.968	~	12	0
20	2XMM J132729.2-472554	AG?	13 27 29.30	-47 25 54.1						~	6	0
21	1RXS J132917.6-472316	Ro*	13 29 18.5921032728	-47 22 50.488736340		13.523	12.468	11.925	10.840	~	7	0
22	M 5	GlC	15 18 33.22	+02 04 51.7		7.34	5.95			~	1872	0
23	HD 317888	*	17 33 05.0168794056	-33 23 28.451047776	10.81	10.99	10.28	10.06		OB+	14	0
24	HD 317889	*	17 33 06.7990635120	-33 24 10.787809824		10.98	9.72			K5	12	0
25	[ADK96] J173319-3323	X	17 33 24.2	-33 23 07						~	2	0
26	Liller 1	Cl*	17 33 24.50	-33 23 20.0						~	230	0
27	NAME Rapid Burster	LXB	17 33 24.61	-33 23 19.8						~	393	2
28	[JVH94] NGC 6397 15	X	17 39 16.54	-53 43 11.3						~	1	0
29	[JVH94] NGC 6397 17	X	17 39 32.92	-53 46 48.7						~	1	0
30	2MASS J17400148-5342271	X	17 40 01.48	-53 42 27.2						~	1	0
31	[JVH94] NGC 6397 8	X	17 40 10.9	-53 50 34						~	2	0
32	[JVH94] NGC 6397 19	X	17 40 14.53	-53 50 31.7						~	1	0
33	[JVH94] NGC 6397 18	X	17 40 30.81	-53 47 51.4						~	1	0
34	CGKB D	QSO	17 40 32.9	-53 43 30						~	4	0
35	CGKB B	LXB	17 40 41.468	-53 40 04.43						~	23	0
36	CGKB C	X	17 40 41.5	-53 40 07						~	4	0
37	[JVH94] NGC 6397 4d	X	17 40 41.56	-53 40 27.7						~	1	0
38	Cl* NGC 6397 SAW V12	CV*	17 40 41.597	-53 40 19.30		18.51	17.95	17.88		~	22	0
39	NGC 6397	GlC	17 40 42.09	-53 40 27.6		7.39	5.17			~	1876	1
40	Cl* NGC 6397 SAW V34	CV*	17 40 42.306	-53 40 28.70		20.02		18.87		~	24	0
41	[JVH94] NGC 6397 4a	X	17 40 42.47	-53 40 28.6						~	1	0
42	V* V1139 Ara	CV*	17 40 42.651	-53 40 19.30		19.10		18.52		~	21	0
43	[CGC98] NF 3	CV*	17 40 42.722	-53 40 27.53		20.04	19.35	20.21		~	16	0
44	Cl* NGC 6397 SAW V13	EB*	17 40 48.978	-53 39 48.62		20.14	19.43	19.14		~	10	0
45	2MASS J17405107-5333482	X	17 40 51.0827899440	-53 33 48.326377860						~	1	0
46	CGKB E	*	17 41 24.1420698360	-53 46 18.579074340						~	2	0
47	HD 160177	**	17 41 27.6346045560	-53 48 10.771523892		10.20	9.36			K1IV/V	29	0
48	CGKB G	G	17 41 34.3	-53 31 54						~	4	0
49	M 28	GlC	18 24 32.89	-24 52 11.4						~	715	0
50	[JVH94] NGC 6752 13	X	19 09 59.88	-59 54 50.6						~	1	0
51	[JVH94] NGC 6752 4	X	19 10 04.0	-59 55 28						~	3	0
52	[JVH94] NGC 6752 15	X	19 10 04.25	-60 02 54.3						~	1	0
53	USNO-A2.0 0225-29896802	*	19 10 04.51	-60 03 18.4						~	1	0
54	[JVH94] NGC 6752 20	X	19 10 12.07	-60 06 06.6						~	1	0
55	[JVH94] NGC 6752 18	X	19 10 32.92	-60 03 59.8						~	1	0
56	[G93] NGC 6752 A	AGN	19 10 40.375	-59 58 41.47		21.76		20.97		~	11	0
57	[JVH94] NGC 6752 7	X	19 10 51.1	-59 58 51						~	2	1
58	Cl* NGC 6752 SAW V27	CV*	19 10 51.138	-59 59 11.92						~	13	0
59	[JVH94] NGC 6752 7a	X	19 10 51.43	-59 58 56.6						~	1	0
60	[JVH94] NGC 6752 22	CV*	19 10 51.505	-59 59 27.10		24.07		23.87		~	9	0
61	Cl* NGC 6752 BRS 2	CV*	19 10 51.511	-59 58 56.85						~	17	0
62	Cl* NGC 6752 SAW V25	CV*	19 10 51.586	-59 59 01.73		21.09		20.10		~	17	0
63	NGC 6752	GlC	19 10 52.11	-59 59 04.4		6.96	6.28			~	1894	0
64	[JVH94] NGC 6752 21	X	19 10 52.51	-59 59 01.9						~	1	0
65	[G93] NGC 6752 D	CV*	19 10 56.005	-59 59 37.33						~	11	0
66	HD 178085	PM*	19 10 57.8503449960	-60 16 19.925911668		8.90	8.347		7.660	G1V	48	0
67	[JVH94] NGC 6752 17	X	19 11 20.33	-60 03 18.5						~	1	0
68	CD-60 7128	*	19 11 41.6980853232	-60 05 09.214608300		10.56	10.11			~	6	0
69	[JVH94] NGC 6752 3	X	19 13 27.1	-59 48 05						~	2	0
70	[G93] NGC 6752 C	X	~	~						~	2	1
71	[G93] NGC 6752 B	X	~	~						~	3	1

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