2000A&AS..144..195O

Query : 2000A&AS..144..195O

2000A&AS..144..195O - Astron. Astrophys., Suppl. Ser., 144, 195-202 (2000/June-1)

Dust properties in NGC 6611.

ORSATTI A.M., VEGA E.I. and MARRACO H.G.

Abstract (from CDS):

An investigation on dust properties in the NW portion of NGC 6611 has been conducted polarimetrically to test the existence of abnormal extinction in that section of the open cluster in an independent way. As previously suggested for the η Carinae nebula by Tapia et al. (1988, in Conference on Dust in the Universe, Bailey M.E. and Williams D.A. (eds.) Cambridge University Press, Cambridge, p.19) and subsequently confirmed by Marraco et al. (1993AJ....105..258M), the canonical relation between E_V–K/E_B–V and λ_max (the wavelength of maximun interstellar polarization) is not valid for stars belonging to dusty HII regions, as is the case for the observed portion of M 16. This may arise mainly from the presence of silicate grains of a slightly larger size than the standard ISM and also from a considerable increase in mean graphite grain size, according to previous results from Chini & Wargau (1990A&A...227..213C). About 50% of the observed stars in NGC 6611 present indications of intrinsic polarization in their measurements; a similar percentage was found in IC 2944 (Vega et al., 1994AJ....108.1834V), another young open cluster in close relation with an HII region.

Abstract Copyright: ∼

Journal keyword(s): ISM: dust, extinction - Galaxy: open clusters and associations: individual: NGC 6611 - ISM: HII regions - ISM: magnetic fields

VizieR on-line data: <Available at CDS (J/A+AS/144/195): object.dat table1.dat table1.tex>

Simbad objects: 46

Full paper

View the references in ADS

Number of rows : 46

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2023	#notes
1	Cl Trumpler 14	OpC	10 43 57	-59 33.2		5.70	5.5			~	489	0
2	Cl Collinder 228	OpC	10 44 00	-60 05.2		4.58	4.4			~	202	0
3	Cl Trumpler 15	OpC	10 44 42	-59 22.1		7.41	7.0			~	204	0
4	Cl Trumpler 16	OpC	10 45 01	-59 42.0		5.35	5.0			~	469	0
5	NGC 3372	HII	10 45 02.23	-59 41 59.8						~	980	2
6	IC 2944	OpC	11 38 20.00	-63 22 22.0						~	181	0
7	2MASS J18180928-1346545	Y*O	18 18 09.2846308800	-13 46 54.553563588	14.410	13.963	12.837		11.292	B0.5V	19	0
8	BD-13 4921	*	18 18 29.9553677376	-13 49 57.614440296	9.81	10.41	9.91			B0.5V	52	0
9	LS IV -13 14	Y*O	18 18 32.2227699960	-13 48 48.055623228	11.343	11.024	10.296	10.38	9.430	OB	49	0
10	BD-13 4923	Y*O	18 18 32.7310836576	-13 45 11.867150808	11.184	10.85	10.08	10.04	8.529	O4V((f+))+O7.5V	53	0
11	HD 168075	SB*	18 18 36.0418343184	-13 47 36.449731536	8.62	9.22	8.77	9.45		O7V(n)((f))z	138	0
12	HD 168076	**	18 18 36.4205083536	-13 48 02.420915796	8.12	8.72	8.25	7.62	7.21	O4III(f)	189	0
13	NGC 6611 213	Em*	18 18 37.0557733920	-13 45 29.513229444	16.932	15.701	14.043		12.05	B	18	0
14	NGC 6611 223	*	18 18 37.8647752080	-13 46 35.150559996	11.44	11.80	11.06			B1V	34	0
15	2MASS J18183846-1345561	Y*O	18 18 38.4653957232	-13 45 56.222199864	13.875	12.34	11.78		11.406	B1V	29	0
16	EM* MWC 916	Ae*	18 18 38.8191340848	-13 46 44.278111416	12.209	11.990	11.127		9.598	Be	28	0
17	NGC 6611 245	Em*	18 18 40.0888470456	-13 47 00.829161204	15.334	14.431	13.512		12.225	A0	19	0
18	BD-13 4927	Y*O	18 18 40.0938541704	-13 45 18.603231696	10.12	10.14	9.48	9.71		O7II(f)	73	0
19	NGC 6611 251	Em*	18 18 40.3593669960	-13 46 18.081271128	14.484	14.066	13.259		12.184	B2Ve	22	0
20	LS IV -13 19	Y*O	18 18 40.7577155496	-13 46 52.031251740	10.84	11.27	11.00			B1V	40	0
21	2MASS J18184096-1345296	Y*O	18 18 40.9652335752	-13 45 29.644481772	12.01	11.85	11.05			B0.5V	30	0
22	NGC 6611 275	*	18 18 42.1891056768	-13 46 52.017747852	12.19	12.51	11.96			B1.5V	22	0
23	BD-13 4928	Be*	18 18 42.7761777816	-13 46 50.969988732	10.05	10.604	10.044	10.23	9.345	OB-	63	0
24	NGC 6611 297	Em*	18 18 44.5246702680	-13 45 48.121323516	13.34	13.55	12.85			B1.5:V	28	0
25	2MASS J18184465-1347563	Y*O	18 18 44.6604719160	-13 47 56.406531264	12.589	12.350	11.718		10.947	B1.5V	29	0
26	NGC 6611 301	*	18 18 44.9814474504	-13 46 24.902605236	12.5	12.76	12.16			B2V	26	0
27	NGC 6611 306	Em*	18 18 45.0318984936	-13 45 41.023635984	13.23	13.35	12.72			B1.5Ve	28	0
28	M 16	OpC	18 18 45	-13 47.5		6.58	6.0			~	1006	2
29	NGC 6611 307	Em*	18 18 45.2535548376	-13 47 20.402438136	15.12	15.16	14.10			B1.5Ve	19	0
30	NGC 6611 311	Em*	18 18 45.60	-13 47 53.1	13.4	13.30	12.74			B2.5Ve	20	0
31	BD-13 4929	Y*O	18 18 45.8504419992	-13 46 30.898082136	10.05	10.509	10.23	10.02	8.830	O7V+B0.5V+B0.5V:	61	0
32	NGC 6611 313	*	18 18 46.1329692120	-13 49 23.438011584		12.11	11.60			B5III	22	0
33	NGC 6611 343	*	18 18 49.3751453496	-13 46 50.032684956	12.4	12.65	11.83			B1V	23	0
34	NGC 6611 349	*	18 18 50.5730358144	-13 47 33.950690700		13.01	11.61			G5III	17	0
35	LS IV -13 22	Em*	18 18 50.6843750856	-13 48 12.721046364	11.953	11.78	11.16		10.443	B1V	34	0
36	2MASS J18185267-1349427	Y*O	18 18 52.6749052848	-13 49 42.634556148	9.04	9.71	9.45		8.968	O9.7IIIp	101	0
37	NGC 6611 371	Em*	18 18 53.0133037800	-13 46 45.082792452	14.577	14.067	13.379		12.388	B0.5Ve	26	0
38	NGC 6611 374	Em*	18 18 53.2682646360	-13 46 07.183104924	15.529	14.406	13.347		11.968	F	21	0
39	NGC 6611 388	Em*	18 18 54.9467872320	-13 48 45.845086428		14.28	13.70			B	16	0
40	2MASS J18185599-1344462	Y*?	18 18 55.9919421912	-13 44 46.367304036	15.858	13.525	11.632		9.857	~	12	0
41	NGC 6611 402	*	18 18 56.0604766560	-13 46 25.706871876		12.39	11.16			K0II	17	0
42	HD 168137	SB*	18 18 56.1894798360	-13 48 31.092549588	8.72	9.36	8.94	9.55		O8Vz	119	0
43	NGC 6611 411	*	18 18 56.97	-13 44 06.5		13.79	12.18			K0V	14	0
44	2MASS J18190042-1342410	Y*O	18 19 00.4286432088	-13 42 41.013464796	14.057	13.635	12.594		11.289	B1.5V	23	0
45	NGC 6611 455	Em*	18 19 02.8906000608	-13 47 17.660578416		12.65	12.05			A5II	16	0
46	BD-13 4936	Ae*	18 19 11.0687166864	-13 56 43.087223148	9.73	10.281	9.763	10.27	8.824	B0/5e	54	0

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