2004A&A...418..509V

Query : 2004A&A...418..509V

2004A&A...418..509V - Astronomy and Astrophysics, volume 418509-523 (2004/5-1)

A Chandra observation of the old open cluster M67.

VAN DEN BERG M., TAGLIAFERRI G., BELLONI T. and VERBUNT F.

Abstract (from CDS):

We present the results of a 47-ks Chandra-ACIS observation of the old open cluster M67. We detected 25 proper-motion cluster members (including ten new sources) and 12 sources (all new) that we suspect to be members from their locations close to the main sequence (1<B-V<1.7). Of the detected members, 23 are binaries. Among the new sources that are members and probable members are four spectroscopic binaries with P_orb<12d, two contact binaries and two periodic photometric variables with P_ph < 8.4 d. Their X-rays are likely the result of coronal activity enhanced by tidally locked rapid rotation. The X-rays of the new source S997, a blue straggler in a wide eccentric orbit, are puzzling. Spectral fits show that the X-rays of the brightest sources S1063 (a binary with a sub-subgiant), S1082 (a triple blue straggler with a close binary) and S1040 (a circular binary of a giant and a cool white dwarf), are consistent with coronal emission. We detected a new bright source that must have brightened at least about ten times since the time of the ROSAT observations. It is not clear whether its faint blue optical counterpart belongs to M67. We discuss the possibility that this source is a low-mass X-ray binary in quiescence, which would be the first of its kind in an open cluster. In addition to cluster members, we detected about 100 background sources, many of which we identify with faint objects in the ESO Imaging Survey.

Abstract Copyright: ∼

Journal keyword(s): stars: activity - stars: binaries: general - stars: blue stragglers - open clusters and associations: individual: M67 - X-rays: binaries

VizieR on-line data: <Available at CDS (J/A+A/418/509): table1.dat notes.dat table4.dat>

Nomenclature: Table 1, col(1): [VTB2004] CX NNN (Nos 1-158). Table 1, last col.: Cl* NGC 2682 EIS NNNN N=43 among (Nos 207-3701).

Status at CDS : All or part of tables of objects will not be ingested in SIMBAD.

Simbad objects: 178

Full paper

View the references in ADS

Number of rows : 178

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2026	#notes
1	NGC 188	OpC	00 47 14.8	+85 14 42						~	990	0
2	NGC 752	OpC	01 56 53.7	+37 45 06						~	712	0
3	[VTB2004] CX 122	X	08 50 49.04	+11 48 16.5						~	1	0
4	[VTB2004] CX 130	X	08 50 51.76	+11 49 21.1						~	1	0
5	[VTB2004] CX 99	X	08 50 52.25	+11 49 03.0						~	1	0
6	SDSS J085052.71+114742.8	AGN	08 50 52.71794	+11 47 42.8980		22.13	21.86			~	5	0
7	NGC 2682 24	SB*	08 50 53.1648732419	+11 47 34.206354717	13.922	13.91	13.307	13.199	12.593	~	35	0
8	[VTB2004] CX 46	X	08 50 53.29	+11 49 43.5						~	1	0
9	Cl* NGC 2682 SAND 810	SB*	08 50 54.3002161944	+11 55 15.280425588	16.323	15.92	15.114		14.154	G7V	24	0
10	Cl* NGC 2682 SAND 819	RS*	08 50 54.9862572848	+11 56 50.269982215	17.667	16.92	15.905			~	33	0
11	[VTB2004] CX 136	X	08 50 55.66	+11 48 40.5						~	1	0
12	Cl* NGC 2682 ES I-43	*	08 50 56.2236755280	+11 45 15.833228400	18.497	17.41	16.280		14.967	~	16	0
13	[BVM98] M 67 24	X	08 50 56.50	+11 45 23.3		20.61	20.27			~	2	0
14	[VTB2004] CX 75	X	08 50 56.89	+11 50 26.4						~	1	0
15	[BVM98] M 67 15	AGN	08 50 57.104	+11 46 07.57		24.63	23.27			~	3	0
16	[VTB2004] CX 59	X	08 50 57.55	+11 52 51.5						~	1	0
17	[BVM98] M 67 36	X	08 50 57.55	+11 52 55.2						~	3	0
18	LB 3596	G	08 50 57.5866318200	+11 50 45.605576688	18.996	19.477	18.454		19.291	~	8	1
19	[VTB2004] CX 86	WD*	08 50 58.61	+11 45 38.8						DA	4	0
20	LB 3597	QSO	08 50 58.8449408328	+11 51 38.476080612	20.567	20.54	20.301			~	23	0
21	[VTB2004] CX 45	X	08 50 58.97	+11 51 37.4						~	1	0
22	[VTB2004] CX 128	X	08 51 01.15	+11 50 02.4						~	1	0
23	NGC 2682 51	SB*	08 51 01.5495469560	+11 49 34.326309756	13.485	13.22	12.57	12.54	11.976	G0IV	33	0
24	Cl* NGC 2682 ES IV-61	*	08 51 01.5612054240	+11 49 27.228376272	15.854	15.48	14.877		13.856	~	9	0
25	NGC 2682 62	SB*	08 51 02.1216094008	+11 49 01.315187544	14.013	13.90	13.297		12.579	G0V	29	0
26	[VTB2004] CX 93	X	08 51 02.73	+11 57 38.4						~	1	0
27	[VTB2004] CX 140	X	08 51 03.11	+11 46 59.5						~	1	0
28	Cl* NGC 2682 ES I-23	*	08 51 03.6146369568	+11 46 17.287883832	17.193	16.92	16.169		15.341	~	11	0
29	RX J085104+11462	X	08 51 03.818	+11 46 30.15		21.57	21.21			~	6	0
30	[VTB2004] CX 154	X	08 51 04.24	+11 49 07.4						~	1	0
31	[VTB2004] CX 56	X	08 51 04.60	+11 42 23.7						~	1	0
32	[BVM98] M 67 34	G	08 51 04.69	+11 55 29.7		22.80	21.99			~	3	0
33	Cl* NGC 2682 SAND 757	EB*	08 51 04.8272787384	+11 45 56.881089612	14.331	14.216	13.541		12.841	~	56	0
34	Cl* NGC 2682 FBC 2984	*	08 51 05.1947750400	+11 55 18.448051332		21.615	20.184		18.621	~	4	0
35	[VTB2004] CX 83	X	08 51 05.41	+11 48 10.7						~	1	0
36	Cl* NGC 2682 FBC 3011	*	08 51 06.3696114552	+11 54 18.817683984		19.874	18.361		16.217	~	15	0
37	[VTB2004] CX 106	X	08 51 07.09	+11 54 07.6						~	1	0
38	Cl* NGC 2682 SAND 1077	SB*	08 51 07.2254409816	+11 53 01.951858464	13.382	13.24	12.595		11.752	F4	53	0
39	NGC 2682 70	*	08 51 07.8118960464	+11 48 09.326114712		11.96	11.522		11.036	F4IV	23	0
40	Cl* NGC 2682 ES IV-33	SB*	08 51 08.0039594736	+11 49 55.884208980	17.117	16.67	15.793	15.244	14.692	~	25	0
41	[VTB2004] CX 115	X	08 51 08.16	+11 52 50.8						~	1	0
42	[VTB2004] CX 87	X	08 51 08.73	+11 57 21.0						~	1	0
43	[VTB2004] CX 39	G	08 51 08.95	+11 50 43.5		22.02	20.62			~	2	0
44	[VTB2004] CX 134	X	08 51 09.09	+11 53 16.1						~	1	0
45	[VTB2004] CX 69	X	08 51 09.39	+11 49 02.1						~	1	0
46	[VTB2004] CX 85	X	08 51 09.77	+11 43 43.5						~	1	0
47	[VTB2004] CX 98	X	08 51 11.06	+11 45 35.3						~	1	0
48	[VTB2004] CX 138	X	08 51 11.24	+11 49 09.1						~	1	0
49	Cl* NGC 2682 FBC 3165	*	08 51 11.4094842144	+11 47 11.017823604		19.953	18.450		16.311	~	12	0
50	[VTB2004] CX 132	X	08 51 11.57	+11 46 32.5						~	1	0
51	[VTB2004] CX 52	X	08 51 11.73	+11 50 25.8						~	1	0
52	[VTB2004] CX 145	X	08 51 12.88	+11 47 39.5						~	1	0
53	Cl* NGC 2682 SAND 1063	RS*	08 51 13.3549065744	+11 51 40.172654052	15.557	14.84	13.573		12.591	G8IV	62	0
54	[VTB2004] CX 103	X	08 51 14.27	+11 53 55.1						~	1	0
55	[VTB2004] CX 137	X	08 51 15.83	+11 46 13.7						~	1	0
56	[VTB2004] CX 74	X	08 51 15.85	+11 48 37.2						~	1	0
57	[VTB2004] CX 142	X	08 51 15.89	+11 49 23.3						~	1	0
58	[VTB2004] CX 113	X	08 51 16.58	+11 51 22.4						~	1	0
59	Cl* NGC 2682 FBC 3348	*	08 51 17.0529379176	+11 48 26.807464440		18.804	17.410		15.793	~	14	0
60	[VTB2004] CX 79	X	08 51 17.09	+11 54 05.7						~	1	0
61	Cl* NGC 2682 ES I-50	SB*	08 51 17.7224075472	+11 44 29.561572500	16.629	16.26	15.347		14.281	~	31	0
62	Cl* NGC 2682 SAND 986	SB*	08 51 17.9917758696	+11 45 54.232467732	13.363	13.28	12.733		12.04	~	84	0
63	Cl* NGC 2682 ES IV-15	SB*	08 51 18.2619418512	+11 50 19.702239432	15.050	14.94	14.292	13.914	13.547	F9V	47	0
64	Cl* NGC 2682 SAND 999	RS*	08 51 18.6870620808	+11 47 02.715891216	13.632	13.38	12.569	12.143	11.69	~	97	0
65	[VTB2004] CX 101	X	08 51 18.72	+11 50 46.4						~	1	0
66	[VTB2004] CX 64	WD?	08 51 18.7811547528	+11 53 49.668752076						~	2	0
67	NGC 2682 119	RS*	08 51 19.0167198768	+11 50 05.755781940	13.197	13.13	12.547	12.177	11.837	F9IV	88	0
68	NGC 2682 120	RS*	08 51 19.1814084740	+11 47 54.691660489	14.248	14.23	13.707	13.307	12.968	F9V	44	0
69	Cl* NGC 2682 SAND 1070	RS*	08 51 19.6901093120	+11 52 10.753229665	14.643	14.52	13.939		13.156	G1V	47	0
70	NGC 2682 124	BS*	08 51 19.9070240880	+11 47 00.441178944	12.576	12.59	12.117	11.848	11.564	F5IV	90	0
71	[VTB2004] CX 90	X	08 51 19.94	+11 56 29.3						~	1	0
72	[VTB2004] CX 114	X	08 51 20.79	+11 45 50.4						~	1	0
73	NGC 2682 131	SB*	08 51 20.794032	+11 53 26.13120		11.647	11.248	11.042	10.722	F5IV	128	0
74	[VTB2004] CX 65	X	08 51 20.86	+11 53 56.4						~	1	0
75	[VTB2004] CX 89	QSO	08 51 21.61	+11 52 08.9						~	2	0
76	NGC 2682 136	SB*	08 51 21.7535381400	+11 52 37.872333372		11.92	11.235		10.595	F8V	84	0
77	[VTB2004] CX 27	X	08 51 22.82	+11 48 14.2						~	1	0
78	Cl* NGC 2682 ES IV-4	SB*	08 51 22.9141132320	+11 48 49.440178944	13.245	13.27	12.695		12.033	F7IV	53	1
79	[VTB2004] CX 112	X	08 51 23.12	+11 48 56.2						~	1	0
80	[VTB2004] CX 144	X	08 51 23.17	+11 46 52.3						~	1	0
81	[VTB2004] CX 110	X	08 51 23.23	+11 47 14.8						~	1	0
82	Cl* NGC 2682 SAND 1019	SB*	08 51 23.2771502112	+11 48 26.560354284	15.407	15.15	14.440	13.842	13.338	G0V	34	0
83	Cl* NGC 2682 FBC 3559	*	08 51 23.4677209704	+11 44 46.197378132	20.860	19.963	18.431		16.428	~	12	0
84	NGC 2682	OpC	08 51 23.5	+11 48 54						~	2528	0
85	NGC 2682 143	SB*	08 51 23.7746734704	+11 49 49.338989364		12.39	11.420		10.61	G4III	105	0
86	[VTB2004] CX 131	X	08 51 24.30	+11 50 39.1						~	1	0
87	[VTB2004] CX 28	X	08 51 24.81	+11 53 31.3						~	1	0
88	[VTB2004] CX 143	X	08 51 24.93	+11 47 40.5						~	1	0
89	NGC 2682 147	RS*	08 51 24.9497688840	+11 49 00.800179176	13.897	13.84	13.282	12.906	12.545	G0V	31	0
90	[VTB2004] CX 92	X	08 51 25.04	+11 48 00.8						~	1	0
91	[VTB2004] CX 63	X	08 51 25.36	+11 57 47.5						~	1	0
92	[VTB2004] CX 126	X	08 51 25.92	+11 53 43.3						~	1	0
93	[VTB2004] CX 108	X	08 51 25.99	+11 43 55.4						~	1	0
94	V* ET Cnc	EB*	08 51 26.7153102238	+11 56 12.173349613	17.711	16.98	15.850			~	38	0
95	[VTB2004] CX 96	X	08 51 26.98	+11 46 38.0						~	1	0
96	[BVM98] M 67 32	AGN	08 51 27.129	+11 55 24.97		25.82	23.46			~	3	0
97	V* EU Cnc	CV*	08 51 27.1835851536	+11 46 56.996141700		21.93	21.75			~	46	0
98	[VTB2004] CX 37	X	08 51 27.38	+11 45 04.3						~	1	0
99	NGC 2682 159	*	08 51 27.8885213448	+11 55 40.949794380	14.598	13.94	13.320		12.625	G1IV	64	0
100	Cl* NGC 2682 SAND 1036	EB*	08 51 28.1469477144	+11 49 27.495860592	13.262	13.27	12.809		12.184	F3	84	0
101	Cl* NGC 2682 SAND 996	SB*	08 51 28.3425078672	+11 46 49.488364668	16.323	15.86	14.972	14.448	13.977	G5V	28	0
102	[VTB2004] CX 12	X	08 51 28.356	+11 41 28.28		22.52	22.40			~	3	0
103	[VTB2004] CX 102	X	08 51 28.42	+11 52 52.1						~	1	0
104	[VTB2004] CX 119	X	08 51 28.45	+11 53 06.6						~	1	0
105	[VTB2004] CX 41	X	08 51 28.90	+11 48 07.4						~	2	0
106	[VTB2004] CX 127	X	08 51 29.29	+11 47 25.0						~	1	0
107	[VTB2004] CX 121	X	08 51 29.56	+11 56 19.5						~	1	0
108	[VTB2004] CX 107	X	08 51 29.91	+11 44 28.3						~	1	0
109	[VTB2004] CX 42	X	08 51 30.30	+11 54 39.7						~	1	0
110	[VTB2004] CX 29	X	08 51 30.58	+11 50 44.8						~	2	0
111	NGC 2682 176	SB*	08 51 31.2372498181	+11 45 50.657346109	13.242	13.22	12.624	12.312	11.950	F8	53	0
112	Cl* NGC 2682 FBC 3814	*	08 51 31.5495427392	+11 50 32.320065120						~	7	0
113	[VTB2004] CX 120	X	08 51 31.83	+11 45 44.4						~	1	0
114	[VTB2004] CX 156	X	08 51 32.13	+11 50 42.3						~	1	0
115	Cl* NGC 2682 ES II-229	*	08 51 32.6283944712	+11 45 59.838259392		20.912	19.265	18.762	17.024	~	9	0
116	[VTB2004] CX 55	X	08 51 33.80	+11 43 27.8						~	1	0
117	NGC 2682 188	BS*	08 51 34.2565152264	+11 50 54.499637148	14.277	14.27	13.774	13.389	13.028	F8V	28	0
118	Cl* NGC 2682 SAND 1284	BS*	08 51 34.3150275672	+11 51 10.497400452		11.17	10.92		10.622	B9V	106	0
119	V* EY Cnc	Ro*	08 51 35.1509860296	+11 50 31.585825032		21.434	19.851	17.9	18.365	~	7	0
120	[VTB2004] CX 66	X	08 51 35.22	+11 56 51.7						~	1	0
121	[VTB2004] CX 158	X	08 51 35.37	+11 48 32.8						~	1	0
122	Cl* NGC 2682 SAND 1203	SB*	08 51 35.5401707784	+11 39 46.985666436	15.252	15.12	14.415		13.504	G4V	22	0
123	[BVM98] M 67 48	G	08 51 35.70	+11 48 00.9		22.72	22.38			~	3	0
124	[VTB2004] CX 135	X	08 51 35.73	+11 43 25.7						~	1	0
125	[VTB2004] CX 97	X	08 51 35.79	+11 53 24.9						~	1	0
126	NGC 2682 195	SB*	08 51 36.0102891818	+11 46 33.602537041	13.539	13.4	12.682	12.328	11.915	G0	64	0
127	[VTB2004] CX 40	X	08 51 36.20	+11 44 46.0						~	2	0
128	[VTB2004] CX 133	X	08 51 37.38	+11 50 17.0						~	1	0
129	Cl* NGC 2682 SAND 1282	SB*	08 51 37.8473566296	+11 50 57.092451072	13.964	13.89	13.333		12.634	F7V	181	0
130	2XMM J085138.4+114906	G	08 51 38.390	+11 49 06.07		20.94	20.79			~	4	0
131	[VTB2004] CX 71	X	08 51 38.52	+11 54 12.3		21.99	21.42			~	2	0
132	[VTB2004] CX 84	X	08 51 40.80	+11 48 13.5						~	1	0
133	[VTB2004] CX 123	X	08 51 41.38	+11 46 56.1						~	1	0
134	[VTB2004] CX 91	X	08 51 41.60	+11 53 08.2						~	1	0
135	NGC 2682 219	SB*	08 51 42.4520308920	+11 49 51.965419080	13.158	13.11	12.606		11.817	F7V	35	0
136	[VTB2004] CX 129	X	08 51 43.09	+11 51 05.4						~	2	0
137	[VTB2004] CX 73	X	08 51 43.13	+11 40 00.1						~	2	0
138	[VTB2004] CX 70	G	08 51 44.05	+11 48 49.7		22.82	22.79			~	2	0
139	[VTB2004] CX 60	X	08 51 44.50	+11 45 47.0						~	1	0
140	[VTB2004] CX 22	G	08 51 46.16	+11 49 50.3		23.32	22.12			~	2	0
141	[VTB2004] CX 105	X	08 51 46.20	+11 42 50.2						~	1	0
142	Cl* NGC 2682 EIS 600	QSO	08 51 46.5697284720	+11 52 02.761924620		20.92	20.74			~	4	0
143	[VTB2004] CX 125	X	08 51 48.27	+11 51 02.8						~	1	0
144	NGC 2682 241	*	08 51 49.1427101712	+11 49 43.607392284	13.385	13.31	12.759		12.025	F8IV	37	0
145	[VTB2004] CX 151	X	08 51 49.82	+11 45 28.9						~	1	0
146	LB 6378	QSO	08 51 49.9413614904	+11 49 52.279783788		20.77	20.64			~	14	0
147	NGC 2682 244	RG*	08 51 50.2026472872	+11 46 06.919342284		11.72	10.700		9.820	G8III	104	0
148	Cl* NGC 2682 FBC 4345	*	08 51 50.33	+11 48 55.9						~	2	0
149	[VTB2004] CX 100	X	08 51 50.37	+11 44 31.1						~	1	0
150	[VTB2004] CX 116	X	08 51 52.03	+11 51 10.6						~	1	0
151	[VTB2004] CX 35	X	08 51 53.18	+11 36 56.8						~	1	0
152	[VTB2004] CX 124	X	08 51 53.94	+11 53 42.2						~	1	0
153	[VTB2004] CX 43	X	08 51 55.81	+11 50 44.5						~	1	0
154	NGC 2682 261	*	08 51 56.0039584272	+11 51 26.532969048		10.91	10.589		10.317	A3	28	0
155	[VTB2004] CX 150	X	08 52 01.1	+11 42 22						~	1	0
156	[VTB2004] CX 44	X	08 52 05.8	+11 37 13						~	1	0
157	Cl* NGC 2682 SAND 1414	*	08 52 06.3658987440	+11 37 31.149933636	15.539	15.453	14.717		13.881	~	14	0
158	[VTB2004] CX 26	X	08 52 07.4	+11 41 18						~	1	0
159	Cl* NGC 2682 EIS 2018	QSO	08 52 07.47	+11 41 14.5		21.67	21.52			~	4	0
160	[VTB2004] CX 51	X	08 52 08.47	+11 47 59.2						~	1	0
161	[VTB2004] CX 34	X	08 52 10.41	+11 47 21.0						~	1	0
162	[VTB2004] CX 80	X	08 52 12.80	+11 49 49.6						~	2	0
163	[VTB2004] CX 11	X	08 52 13.78	+11 46 26.0						~	1	0
164	Cl* NGC 2682 FBC 4960	*	08 52 14.4091238640	+11 46 33.022657236	17.263	16.78	15.807		14.688	~	20	0
165	Cl* NGC 2682 SAND 1601	EB*	08 52 16.8391686288	+11 48 31.249877400		15.45	14.651		13.33	~	23	0
166	[VTB2004] CX 54	X	08 52 16.9	+11 41 21						~	1	0
167	Cl* NGC 2682 FBC 5023	Ro*	08 52 17.0383800336	+11 41 09.065716296	19.661	18.595	16.919		14.255	~	12	0
168	[VTB2004] CX 147	X	08 52 18.2	+11 46 15						~	1	0
169	[VTB2004] CX 148	X	08 52 21.0	+11 42 07						~	1	0
170	[VTB2004] CX 38	X	08 52 22.1	+11 39 12						~	1	0
171	[VTB2004] CX 25	X	08 52 22.59	+11 45 37.3						~	1	0
172	[VTB2004] CX 18	X	08 52 25.1	+11 45 21						~	1	0
173	[VTB2004] CX 50	X	08 52 27.0	+11 37 35						~	1	0
174	[VTB2004] CX 30	X	08 52 27.7	+11 41 14						~	1	0
175	[VTB2004] CX 146	X	08 52 28.0	+11 50 55						~	1	0
176	IC 4651	OpC	17 24 48.5	-49 55 23						~	374	0
177	SAX J1808.4-3658	LXB	18 08 27.58	-36 58 43.9						~	1051	0
178	NGC 6940	OpC	20 34 28.4	+28 17 07						~	215	0

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