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 EV–K/EB–V and λmax (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

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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 - 2026 		#notes
1 Cl Trumpler 14 OpC 10 43 56.0 -59 33 07   5.70 5.5     ~ 547 0
2 Cl Collinder 228 OpC 10 44 00 -60 05.2           ~ 211 0
3 Cl Trumpler 15 OpC 10 44 43.6 -59 22 07           ~ 229 0
4 Cl Trumpler 16 OpC 10 45 01.9 -59 42 00           ~ 510 0
5 NGC 3372 HII 10 45 02.23 -59 41 59.8           ~ 1071 2
6 IC 2944 OpC 11 38 20.00 -63 22 22.0           ~ 191 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 22 0
8 BD-13 4921 Y*O 18 18 29.9553677376 -13 49 57.614440296 9.81 10.41 9.91     B0.7V 58 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 O9V 56 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 60 0
11 HD 168075 Y*O 18 18 36.0418343184 -13 47 36.449731536 8.62 9.22 8.77 9.45   O7V(n)((f))z 149 0
12 HD 168076 Y*O 18 18 36.4205083536 -13 48 02.420915796 8.12 8.72 8.25 7.62 7.21 O4III(f) 209 0
13 NGC 6611 213 Y*O 18 18 37.0557733920 -13 45 29.513229444 16.932 15.701 14.043   12.05 B 19 0
14 NGC 6611 223 Y*O 18 18 37.8647752080 -13 46 35.150559996 11.44 11.80 11.06     B1V 38 0
15 2MASS J18183846-1345561 Y*O 18 18 38.4653957232 -13 45 56.222199864 13.875 12.34 11.78   11.406 B1V 31 0
16 EM* MWC 916 Ae* 18 18 38.8191340848 -13 46 44.278111416 12.209 11.990 11.127   9.598 Be 34 0
17 NGC 6611 245 Or* 18 18 40.0888470456 -13 47 00.829161204 15.334 14.431 13.512   12.225 A0 22 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) 82 0
19 NGC 6611 251 Y*O 18 18 40.3593669960 -13 46 18.081271128 14.484 14.066 13.259   12.184 B2Ve 26 0
20 LS IV -13 19 Y*O 18 18 40.7577155496 -13 46 52.031251740 10.84 11.27 11.00     B1V 45 0
21 2MASS J18184096-1345296 Y*O 18 18 40.9652335752 -13 45 29.644481772 12.01 11.85 11.05     B0.5V 32 0
22 NGC 6611 275 * 18 18 42.1891056768 -13 46 52.017747852 12.19 12.51 11.96     B1.5V 25 0
23 BD-13 4928 Be* 18 18 42.7761777816 -13 46 50.969988732 10.05 10.604 10.044 10.23 9.345 O9.7IVnn 72 0
24 NGC 6611 297 Y*O 18 18 44.5246702680 -13 45 48.121323516 13.34 13.55 12.85     B1.5:V 32 0
25 NGC 6611 296 Y*O 18 18 44.6604719160 -13 47 56.406531264 12.589 12.350 11.718   10.947 B1.5V 33 0
26 NGC 6611 301 * 18 18 44.9814474504 -13 46 24.902605236 12.5 12.76 12.16     B2V 28 0
27 NGC 6611 306 Y*O 18 18 45.0318984936 -13 45 41.023635984 13.23 13.35 12.72     B1.5Ve 32 0
28 M 16 OpC 18 18 45.1 -13 47 31           ~ 1084 1
29 NGC 6611 307 Y*O 18 18 45.2535548376 -13 47 20.402438136 15.12 15.16 14.10     B1.5Ve 23 0
30 NGC 6611 311 Em* 18 18 45.60 -13 47 53.1 13.4 13.30 12.74     B2.5Ve 21 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: 70 0
32 NGC 6611 313 Y*O 18 18 46.1329692120 -13 49 23.438011584   12.11 11.60     B5III 26 0
33 NGC 6611 343 EB* 18 18 49.3751453496 -13 46 50.032684956 12.4 12.646 11.792   10.461 B1V 27 0
34 NGC 6611 349 Y*? 18 18 50.5730358144 -13 47 33.950690700   13.01 11.61     G5III 18 0
35 LS IV -13 22 Em* 18 18 50.6843750856 -13 48 12.721046364 11.953 11.78 11.16   10.443 B1V 38 0
36 BD-13 4930 Y*O 18 18 52.6749052848 -13 49 42.634556148 9.04 9.71 9.45   8.968 O9.7V 116 0
37 NGC 6611 371 Y*O 18 18 53.0133037800 -13 46 45.082792452 14.577 14.067 13.379   12.388 B0.5Ve 31 0
38 NGC 6611 374 dS* 18 18 53.2682646360 -13 46 07.183104924 15.529 14.406 13.347   11.968 F 25 0
39 NGC 6611 388 Y*O 18 18 54.9467872320 -13 48 45.845086428   14.28 13.70     B 19 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 18 0
42 HD 168137 Y*O 18 18 56.1894798360 -13 48 31.092549588 8.72 9.36 8.94 9.55   O8Vz 131 0
43 NGC 6611 411 * 18 18 56.97 -13 44 06.5   13.79 12.18     K0V 14 0
44 NGC 6611 444 Y*O 18 19 00.4286432088 -13 42 41.013464796 14.057 13.635 12.594   11.289 B1.5V 28 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 58 0

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