2001A&A...375..539C


C.D.S. - SIMBAD4 rel 1.7 - 2020.04.05CEST22:42:34

2001A&A...375..539C - Astronomy and Astrophysics, volume 375, 539-552 (2001/8-4)

Near-infrared imaging of compact HII regions in Cygnus X.

COMERON F. and TORRA J.

Abstract (from CDS):

We present a near-infrared imaging survey of compact HII regions in the direction of the Cygnus X complex, for which no previous observations at those wavelengths have been published so far. The targets have been selected from a catalog of sources in that region having a thermal spectral energy distribution between 408 and 4800MHz (Wendker et al. 1991), and an inferred angular size smaller than 5 arcmin across. We present images in the JHK filters, color-magnitude, and color-color diagrams for each region. We also suggest and apply a method for estimating the distance by comparing the dereddened H-band flux from all the stars in the area of the HII region and the radio-continuum flux. Many of the regions imaged are clearly associated with stellar aggregates with different degrees of concentration, whose components show varying amounts of extinction. Some objects are often found in the region of the (J-H), (H-K) diagram indicating excess emission of circumstellar nature. A detailed discussion on each object is provided in the context of existing published observations at different wavelengths, in particular regarding the existence of ultracompact components. A number of ultracompact HII regions are found to have clearly visible unresolved or nearly unresolved K-band counterparts characterized by very red H-K colors, suggesting that the extinction may be low enough in their direction so as to allow the direct observation of the star ionizing the ultracompact component.

Abstract Copyright:

Journal keyword(s): stars: early-type - HII regions - Cygnus X

VizieR on-line data: <Available at CDS (J/A+A/375/539): table2.dat>

Status at CDS:  

CDS comments: HC = [HC96] G75.78-0.34. FIR 1, IRS1 and IRS3 = [OCS90] DR 15 FIR 1, [OCS90] DR 15 IRS 1 and IRS 3.

Simbad objects: 47

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Number of rows : 47

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 IC 1318 HII 20 16 48 +41 57.4           ~ 42 0
2 Ass Cyg OB 1 As* 20 17.8 +37 38           ~ 241 1
3 HD 228841 Em* 20 18 29.6947589641 +38 52 39.772785669 9.08 9.50 9.01     O6.5Vn((f)) 54 0
4 18P 14 Rad 20 18 31.2 +38 51 22           ~ 2 0
5 HD 229059 s*b 20 21 15.3643765026 +37 24 31.103826768 10.66 10.23 8.70     B2Iabe 87 0
6 EM* MWC 1015 Be* 20 21 33.5824030045 +37 24 51.700453757 13.75 13.28 11.84     B1.5Ve 53 1
7 V* BC Cyg s*r 20 21 38.5480930133 +37 31 58.917783927   14.61 11.30     M3.5Ia 151 0
8 ECX6-7A ~ 20 21 39.2 +37 31 17           ~ 1 0
9 GAL 075.76+00.34 Mas 20 21 41.1 +37 25 30           ~ 16 1
10 [HC96] G75.78-0.34 5 Mas 20 21 41.3 +37 25 38           ~ 3 1
11 18P 20B Rad 20 21 41.4 +37 26 10           ~ 2 0
12 Cl Berkeley 87 OpC 20 21 43.01 +37 22 13.8           ~ 107 0
13 OH 75.8 +0.3 HII 20 21 43.8 +37 26 39           ~ 91 2
14 [HC96] G75.78-0.34 4 Mas 20 21 44.0 +37 26 37           ~ 4 1
15 [HC96] G75.78-0.34 2 Mas 20 21 44.0 +37 26 37           ~ 2 1
16 [HC96] G75.78-0.34 1 Mas 20 21 44.0 +37 26 38           ~ 8 1
17 WR 142 WR* 20 21 44.3438534563 +37 22 30.543604467   14.39 12.99 12.73 11.04 WO2 119 0
18 IRAS 20220+3728 Y*O 20 23 55.107 +37 38 10.45           ~ 46 3
19 WSTB 46W22 Rad 20 23 55.8 +37 38 12           ~ 3 0
20 WSTB 46W24 Rad 20 25 23.3 +37 23 10           ~ 2 0
21 IC 1318b ISM 20 27 +40.5           ~ 17 0
22 18P 37 HII 20 27 13.1 +39 26 08           ~ 19 0
23 DWB 67 HII 20 27.3 +39 42           ~ 15 0
24 SH 2-106 HII 20 27 26.8 +37 22 49           ~ 408 2
25 18P 42 Rad 20 28 10.1 +40 52 00           ~ 35 0
26 [KCW94] 079.320+01.313 Rad 20 28 10.235 +40 53 37.96           ~ 4 0
27 NAME Cyg X Cld 20 28 41 +41 10.2           ~ 605 1
28 UCAC2 45558758 * 20 29 35.9609297978 +39 01 12.705556899     10.2 11.53   ~ 1 0
29 18P 51 Rad 20 30 27.2 +41 15 40           ~ 13 0
30 MITG J203029+4115 mul 20 30 29.9 +41 15 51           ~ 49 1
31 IRAS 20293+3952 HII 20 31 11.040 +40 03 10.69           ~ 66 0
32 18P 58 Rad 20 32 21.8 +43 41 12           ~ 3 0
33 [BNM96] 079.296+0.284 HII 20 32 27.9386824590 +40 16 07.618081278           ~ 30 0
34 18P 59 HII 20 32 31.2 +40 16 35           ~ 63 0
35 RAFGL 2602 IR 20 32 35.5485502504 +40 16 05.777931392           ~ 10 0
36 Ass Cyg OB 2 As* 20 33.2 +41 19           ~ 776 0
37 IRAS 20316+4155 FIR 20 33 22.9 +42 05 38           ~ 2 0
38 18P 60 Rad 20 33 23.1 +42 04 47           ~ 2 0
39 GB6 B2032+4112 Rad 20 33 55.4 +41 23 03           ~ 24 1
40 18P 64 Rad 20 35 08.4 +41 13 20           ~ 21 0
41 GRS G081.70 +00.50 SFR 20 39 01.6 +42 19 38           O4.5 937 0
42 3C 423 Rad 20 45 37.80 +44 15 02.8           ~ 19 1
43 IC 5070 HII 20 51.0 +44 22           ~ 173 1
44 NGC 7000 HII 20 58 47 +44 19.8           ~ 358 1
45 EGGR 150 WD* 21 52 25.3788480672 +02 23 19.576520492 11.942 12.732 12.743 12.839 12.938 DA2.8 162 0
46 [OCS90] DR 15 FIR 1 * ~ ~           B0 4 0
47 [OCS90] DR 15 IRS 3 IR ~ ~           ~ 3 0

    Equat.    Gal    SGal    Ecl

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2020.04.05-22:42:34

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