2007A&A...471..165O

Query : 2007A&A...471..165O

2007A&A...471..165O - Astronomy and Astrophysics, volume 471165-172 (2007/8-3)

Revisiting the region of the open cluster NGC 5606.

ORSATTI A.M., FEINSTEIN C., VEGA E.I. and VERGNE M.M.

Abstract (from CDS):

We present polarimetric observations in the UBVRI bands corresponding to 54 stars located in the direction of NGC 5606. Our intention is to analyze the dust characteristics between the Sun and the cluster, as well as to confirm doubtful memberships using polarimetric tools. We also want to determine if a group of 11 B and A stars identified in the past by Vazquez & Feinstein (1991A&AS...87..383V) in front of NGC 5606 has any physical entity. From polarimetric data we have found at least two dust layers along the line of sight to the open cluster. The observations show that both dust layers have their local magnetic field with an orientation which is close to the direction of the Galactic Plane (θ=70.0deg), but the direction of the polarimetric vector for the members of the cluster seems to be lower than this value. NGC 5606 can be polarimetrically characterized with P_max=2.97% and θ_v=63.5deg. The internal dispersion of the polarization values for the members of NGC 5606 seems to be compatible with intracluster dust. We were able to add four possible new members to the list of stars in NGC 5606, and to reject others accepted as members in past investigations; and we identified 17 (out of the 54 observed stars) with intrinsic polarization in their light. The group of late B- and A-type stars could be physically related, with characteristics of an open cluster of intermediate age (between 0.79 and 1.x10⁸yr). For this group we obtained representative values of P= 2.12% and θ_v=70.9deg. The new cluster, which we have provisionally named Anon (La Plata 1), extends from NE to SW across the face of NGC 5606 covering about 10'. The fitting procedure of Schmidt-Kaler's ZAMS (1982, in Landolt/Bornstein, Neue Series VI/2b) was used to derive the distance to the group, obtaining a distance modulus of V_o-M_v=9.90 (649pc from the Sun). The mean color excess associated with the small group is E_B–V=0.27±0.08mag and the dust distribution shows great variability across its face. We think that the small open cluster has gone undetected due to the lack of bright member stars in it.

Abstract Copyright: ∼

Journal keyword(s): ISM: dust, extinction - open clusters and associations: individual: NGC 5606 - techniques: polarimetric

VizieR on-line data: <Available at CDS (J/A+A/471/165): table1.dat table2.dat>

Nomenclature: Tables 1, 2: Cl* NGC 5606 VF NN N=54 among (Nos 1-68) (N=11 added).

CDS comments: "La Plata 1" not identified.

Simbad objects: 61

Full paper

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Number of rows : 61

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	CD-59 5245	*	14 26 47.3169325392	-59 40 36.035993208		10.58	10.55			~	2	0
2	CD-59 5246	*	14 26 48.5461604760	-59 40 03.305161848		11.11	11.18			~	2	0
3	HD 126357	bC*	14 27 08.7344355960	-59 44 11.279134428	8.66	9.56	9.26	9.62		B1III	34	0
4	CPD-59 5570	*	14 27 11.0553228096	-59 43 08.132213280		11.57	11.32	11.18		~	3	0
5	CD-59 5250	*	14 27 15.7783142832	-59 45 48.508773624		10.79	10.52			~	2	0
6	Cl* NGC 5606 VF 63	*	14 27 16.9846172760	-59 35 32.736175836						~	1	0
7	Cl* NGC 5606 VF 49	*	14 27 18.8948103456	-59 45 06.743454408		14.03	13.30	13.26		~	2	0
8	Cl* NGC 5606 VF 48	*	14 27 22.0477114824	-59 45 20.771156952		13.63	12.50			~	2	0
9	Cl* NGC 5606 VF 47	*	14 27 23.0084314632	-59 44 49.912854684		13.02	12.49	12.47		~	2	0
10	Cl* NGC 5606 VF 44	*	14 27 24.5353981008	-59 43 19.152016752						~	1	0
11	Cl* NGC 5606 VF 68	*	14 27 29.8381491744	-59 46 18.039221292		12.73	12.62			~	2	0
12	CD-59 5253	*	14 27 30.0351646968	-59 40 43.633102800		10.98	10.67	10.43		~	2	0
13	Cl* NGC 5606 VF 45	*	14 27 30.7567413984	-59 42 14.248911060						~	1	0
14	UCAC2 5650134	PM*	14 27 35.8805126112	-59 41 43.629821196						~	3	0
15	Cl* NGC 5606 VF 31	**	14 27 35.921592	-59 41 10.96008		13.54	13.07	13.01		~	3	0
16	Cl* NGC 5606 VBFP 34	*	14 27 40.9013727264	-59 36 45.179328600	13.65	13.70	13.28	13.00	12.66	~	7	0
17	Cl* NGC 5606 VBFP 10	*	14 27 41.0131688568	-59 37 13.110378960	13.62	13.71	13.36	13.13	12.82	~	7	0
18	NGC 5606 14	*	14 27 42.3508041888	-59 38 03.706943460		12.01	11.71	11.86		~	6	0
19	CD-59 5257	*	14 27 44.0711003880	-59 37 59.743837488	9.28	9.75	9.48	9.99	9.26	B1IV	22	0
20	NGC 5606 12	*	14 27 44.6725792800	-59 38 31.325408196		12.61	12.15	11.92		~	5	0
21	Cl* NGC 5606 VBFP 129	*	14 27 46.1811071760	-59 39 36.616727376	13.46	13.53	13.15	12.90	12.61	~	7	0
22	HD 126449	*	14 27 46.7435232072	-59 37 56.601697728	8.36	9.08	8.78	8.54	8.32	B0/1(III)	26	0
23	NGC 5606 13	*	14 27 47.1675746736	-59 38 54.993985764	12.94	13.16	12.83	12.64	12.35	~	8	0
24	NGC 5606 11	*	14 27 48.3031622496	-59 38 30.516813852		13.25	12.92	12.66		~	5	0
25	NGC 5606 5	*	14 27 49.1336585016	-59 37 39.566274204	10.71	10.90	10.93	11.04		OB-	11	0
26	NGC 5606	OpC	14 27 49.7	-59 37 45						~	109	0
27	NGC 5606 6	*	14 27 51.0393529224	-59 37 52.191072984		12.26	11.91	11.75		~	7	0
28	Cl* NGC 5606 VF 24	*	14 27 52.132	-59 39 53.84						~	2	0
29	NGC 5606 9	*	14 27 52.7385070488	-59 37 15.799949220		13.12	12.78	12.55		~	7	0
30	Cl* NGC 5606 VF 21	*	14 27 52.8376496520	-59 39 07.251050664						~	4	0
31	NGC 5606 10	*	14 27 52.9301631960	-59 38 35.138164776		14.91	14.32			~	3	0
32	NGC 5606 8	Pu*	14 27 53.6146168920	-59 37 54.114088440	13.35	13.38	13.07	12.89	12.60	~	7	0
33	NGC 5606 7	*	14 27 53.6210478336	-59 38 08.275390368	12.42	12.75	12.48	12.27	12.00	~	8	0
34	CD-59 5259	Pu*	14 27 55.5158658696	-59 37 30.770398776	9.59	10.35	9.98	10.09	9.45	B0IV	33	0
35	Cl* NGC 5606 VF 50	*	14 27 55.9093097472	-59 43 48.264069252		12.49	11.73			~	2	0
36	Cl* NGC 5606 VF 55	*	14 27 56.9185570632	-59 41 50.981654148		13.99	12.19			~	2	0
37	CD-59 5260	Pu*	14 27 57.3562970232	-59 38 07.571192676	9.52	10.27	9.92	10.03	9.37	B0IV	35	0
38	HD 126477	*	14 27 58.1338943664	-59 28 20.841928284		9.89	9.89			B8/9III/IV	7	0
39	Cl* NGC 5606 VF 52	*	14 28 00.5682725928	-59 44 30.849453564						~	2	0
40	Cl* NGC 5606 VF 54	*	14 28 01.9244620656	-59 42 46.523152260		13.55	13.11			~	2	0
41	Cl* NGC 5606 VF 53	*	14 28 05.3387052120	-59 43 55.241128164		12.88	10.93			~	2	0
42	2MASS J14280584-5939401	Y*?	14 28 05.8517207328	-59 39 40.230986220	14.40	14.15	13.71	13.44	13.10	~	2	0
43	CPD-59 5586	*	14 28 05.9402005536	-59 36 02.086482168	10.87	11.40	11.02	11.03	10.41	OB-	10	0
44	Cl* NGC 5606 VF 36	*	14 28 07.7391305784	-59 36 35.960543244	12.32	12.64	12.30	12.08	11.78	~	6	0
45	Cl* NGC 5606 VF 41	*	14 28 10.9284099792	-59 33 25.345179432		13.55	12.86	12.78		~	2	0
46	Cl* NGC 5606 VF 37	*	14 28 11.3211105456	-59 36 27.188267292		13.35	12.63			~	2	0
47	Cl* NGC 5606 VF 35	*	14 28 12.99	-59 35 25.0		12.64	12.34			~	2	0
48	Cl* NGC 5606 VF 38	*	14 28 13.0210384128	-59 36 11.442608496						~	1	0
49	Cl* NGC 5606 VF 61	*	14 28 21.6488604552	-59 37 51.666756852						~	1	0
50	CPD-59 5589	*	14 28 21.9002927784	-59 35 57.636028572	10.78	11.24	10.89	10.95	10.40	OB-	14	0
51	Cl* NGC 5606 VF 43	*	14 28 25.4594508648	-59 40 11.096049648		13.31	12.07			~	2	0
52	Cl* NGC 5606 VF 42	*	14 28 30.4103408616	-59 36 43.817508576		12.35	11.88			~	2	0
53	HD 126577	AB*	14 28 33.0213619776	-59 40 26.686073748		10.55	8.39			M2/3	18	0
54	Cl* NGC 5606 VF 40	Pu*	14 28 42.8378818440	-59 34 29.005313556		11.99	11.51			OB	8	0
55	CD-59 5270	*	14 28 48.1737576744	-59 42 23.155000272		11.19	11.14	11.13		~	2	0
56	NGC 6167	OpC	16 34 41.4	-49 46 02		7.58	6.7			~	87	0
57	NGC 6193	OpC	16 41 14.9	-48 46 47						~	169	0
58	NGC 6204	OpC	16 46 09.1	-47 01 29		8.51	8.2			~	139	0
59	Cl Hogg 22	OpC	16 46 34.1	-47 06 12						~	81	0
60	Cl Trumpler 27	OpC	17 36 20	-33 31.0		8.24	6.7			~	100	1
61	NAME Sgr Arm	PoG	19 00	-30.0						~	710	1

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