2001PASP..113..195H

Query : 2001PASP..113..195H

2001PASP..113..195H - Publ. Astron. Soc. Pac., 113, 195-196 (2001/February-0)

On the Be and Ae stars in NGC 6611.

HERBIG G.H. and DAHM S.E.

Abstract (from CDS):

The young cluster NGC 6611 is of interest because it has been believed to contain an unusually large number of Be and Ae stars. The cluster is embedded in a very bright H II region, so that proper subtraction of that background on slit or multiobject fiber-fed spectra is important. If stellar line emission is present in blue-violet Balmer lines, it should be more prominent at Hα. We have examined some 40 of these cluster stars on Hα slitless spectrograms, which are not subject to such contamination, and were able to confirm the presence of Hα emission above the continuum level in only four. About 25 much fainter Hα emitters were found in the cluster; these are probably the brightest members of a low-mass T Tauri population. None are convincingly associated with the famous elephant-trunk structures seen in projection against the H II region.

Abstract Copyright: ∼

Journal keyword(s): open clusters and associations: individual (M16, NGC 6611) - Stars: Emission-Line, Be - Stars: Formation

Simbad objects: 45

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Number of rows : 45
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 6611 112 Y*O 18 18 25.2191742672 -13 53 19.434041340 14.52 14.40 13.89     Ae 15 0
2 NGC 6611 138 Em* 18 18 27.2550625800 -13 45 24.293682828 15.87 15.46 14.83     Ae 8 0
3 NGC 6611 202 Y*O 18 18 36.0133590282 -13 45 13.141419085   15.2 14.40     A0 17 0
4 [HMS93] J181836.70-135048.3 Em* 18 18 36.66 -13 50 47.5 14.97 14.60 14.02     Ae 10 0
5 NGC 6611 207 Y*O 18 18 36.7391608848 -13 47 33.067922460 12.32 12.57 12.05     B1Ve 29 0
6 NGC 6611 213 Y*O 18 18 37.0557733920 -13 45 29.513229444 16.932 15.701 14.043   12.05 B 19 0
7 NGC 6611 221 dS* 18 18 37.6378754208 -13 45 13.223670624 16.771 15.651 14.463   12.789 B8Ve 20 0
8 NGC 6611 227 Y*O 18 18 38.4019036872 -13 47 09.063135564 13.18 13.487 12.753   11.792 B1.5Ve 37 0
9 EM* MWC 916 Ae* 18 18 38.8191340848 -13 46 44.278111416 12.209 11.990 11.127   9.598 Be 34 0
10 NGC 6611 243 Y*O 18 18 39.7527077952 -13 46 56.379017100 14.979 14.453 13.705   12.728 B8Ve 25 0
11 NGC 6611 245 Or* 18 18 40.0888470456 -13 47 00.829161204 15.334 14.431 13.512   12.225 A0 22 0
12 NGC 6611 251 Y*O 18 18 40.3593669960 -13 46 18.081271128 14.484 14.066 13.259   12.184 B2Ve 26 0
13 NGC 6611 262 EB* 18 18 41.5439740971 -13 48 40.403404277 14.55 14.534 13.792   12.814 Ae 18 0
14 NGC 6611 266 Y*O 18 18 41.5798507368 -13 46 30.924135624 16.711 15.701 14.267   12.510 G 23 0
15 NGC 6611 267 Y*O 18 18 41.6931488496 -13 46 43.854056976 13.43 13.63 13.07     B3V 20 0
16 NGC 6611 273 Y*? 18 18 42.2520475416 -13 47 30.442757100 15.731 14.915 14.113   13.065 A0 20 0
17 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
18 NGC 6611 281 Y*O 18 18 42.8896213392 -13 46 42.652860492 14.58 14.39 13.80     Ae 18 0
19 NGC 6611 297 Y*O 18 18 44.5246702680 -13 45 48.121323516 13.34 13.55 12.85     B1.5:V 32 0
20 NGC 6611 306 Y*O 18 18 45.0318984936 -13 45 41.023635984 13.23 13.35 12.72     B1.5Ve 32 0
21 NGC 6611 300 Y*O 18 18 45.0400249440 -13 47 47.176122696 13.642 13.276 12.607   11.787 B1.5Ve 31 0
22 NGC 6611 299 Ae* 18 18 45.0886897464 -13 49 19.481791476 16.068 15.211 14.313   13.359 A3/5 18 0
23 M 16 OpC 18 18 45.1 -13 47 31           ~ 1084 1
24 NGC 6611 307 Y*O 18 18 45.2535548376 -13 47 20.402438136 15.12 15.16 14.10     B1.5Ve 23 0
25 NGC 6611 311 Em* 18 18 45.60 -13 47 53.1 13.4 13.30 12.74     B2.5Ve 21 0
26 NGC 6611 313 Y*O 18 18 46.1329692120 -13 49 23.438011584   12.11 11.60     B5III 26 0
27 NGC 6611 322 Y*O 18 18 46.6060913616 -13 46 59.886730956 14.39 14.3 13.68   12.618 B8V:e 20 0
28 NGC 6611 323 Y*O 18 18 46.7447809896 -13 47 48.699157308 13.84 14.01 13.44     B5Ve 18 0
29 NGC 6611 336 Y*O 18 18 49.1681100312 -13 48 04.229034444 14.243 13.802 13.288   12.419 B5III 28 0
30 NGC 6611 339 Y*O 18 18 49.2032790240 -13 46 54.301258704   14.64 13.75     ~ 16 0
31 LS IV -13 22 Em* 18 18 50.6843750856 -13 48 12.721046364 11.953 11.78 11.16   10.443 B1V 38 0
32 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
33 NGC 6611 374 dS* 18 18 53.2682646360 -13 46 07.183104924 15.529 14.406 13.347   11.968 F 25 0
34 NGC 6611 388 Y*O 18 18 54.9467872320 -13 48 45.845086428   14.28 13.70     B 19 0
35 NGC 6611 396 Y*O 18 18 55.5847278072 -13 48 44.550286632 16.369 15.305 13.965   12.326 G8 21 0
36 NGC 6611 389 Em* 18 18 55.5935679840 -13 54 44.282839392 15.36 14.93 14.37     B8Ve 10 0
37 NGC 6611 400 Y*O 18 18 55.8331505520 -13 46 54.058308492 14.248 13.493 12.789   11.770 B9III 30 0
38 NGC 6611 455 Em* 18 19 02.8906000608 -13 47 17.660578416   12.65 12.05     A5II 16 0
39 NGC 6611 472 Y*O 18 19 04.7114310432 -13 44 44.557244268 13.07 13.421 12.846   12.109 B3Ve 22 0
40 BD-13 4933 Be* 18 19 04.8784525032 -13 48 20.444449032 11.259 11.095 10.628   9.915 B0.5Vn 51 0
41 [HMS93] J181906.96-134504.5 Em* 18 19 06.91 -13 45 04.4   12.88 12.36     B8III 15 0
42 V* EU Ser Ae* 18 19 09.3931184496 -13 50 41.201118528 14.934 14.697 14.158   12.923 Be 35 0
43 [HMS93] J181909.71-135127.7 Em* 18 19 09.6530281136 -13 51 27.410847677 15.08 14.69 14.06     Ae 12 0
44 NGC 6611 504 Em* 18 19 10.3004420376 -13 49 03.869260680   13.2 12.80     B9III 14 0
45 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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