1998A&A...339..759F


Query : 1998A&A...339..759F

1998A&A...339..759F - Astronomy and Astrophysics, volume 339, 759-772 (1998/11-3)

The ultracompact H II region G45.45+0.06. A pearl necklace in the sky.

FELDT M., STECKLUM B., HENNING T., HAYWARD T.L., LEHMANN T. and KLEIN R.

Abstract (from CDS):

We present new imaging data on the ultracompact HII region G45.45+0.06 at near- and mid-infrared wavelengths. High-resolution data were taken in the H and K' bands using ESO's adaptive optics system ADONIS. The resulting images with a generic resolution of 0.4" for the first time allow the resolution of the object into several single point-like sources. Additionally, we present images obtained in the mid-infrared at 3.5, 10, and 12µm. A Brγ image was obtained to serve as a measure for the extinction towards this region. We derive the physical properties of the point sources and show that some of them are young, massive stars. By combining our data with earlier VLA maps, we measure the extinction towards the region and discuss the history of the object. Finally, we conclude that G45.45+0.06 is a young OB cluster similar to the KL/BN Region in Orion and that sequential star formation is the reason for its present morphology.

Abstract Copyright:

Journal keyword(s): methods: observational - H II regions - stars: formation - stars: early-type

Nomenclature: Table 2: [FSH98] a (Nos a-o, j missing), [FSH98] R (Nos I to VI), [FSH98] MIR N (Nos 1-2).

CDS comments: T.1 : Y 4338 not identified (PLX?), gam Aqu : Aql or Aqr?, GL 748 : AFGL or GJ?

Simbad objects: 40

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Number of rows : 40
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 V* HL Tau Or* 04 31 38.471952 +18 13 58.08504   15.89 14.49 14.39   K5 1280 0
2 IRAS 04287+1807 mul 04 31 38.8 +18 13 57           ~ 796 0
3 SNR G182.4+04.3 SNR 06 08.2 +29 00           ~ 27 0
4 NAME Cha IR Nebula TT* 11 08 38.702 -77 43 51.54           M5.5 72 0
5 NGC 3660 Sy2 11 23 32.2791583222 -08 39 30.755681618   15.34 14.45     ~ 167 0
6 SNR G296.8-00.3 SNR 11 58 30 -62 35.0           ~ 52 0
7 * alf Ser PM* 15 44 16.0743159 +06 25 32.263272 5.080 3.800 2.630 1.82 1.25 K2IIIbCN1 503 0
8 CD-24 13806 ** 18 03 40.3201452689 -24 22 42.860589572 10.26 11.022 10.372 10.267   O7:V 182 0
9 GAL 005.97-01.17 HII 18 03 40.501 -24 22 44.46           ~ 33 0
10 M 16 OpC 18 18 48 -13 48.4   6.58 6.0     ~ 971 2
11 2MASS J18191220-2047297 Y*O 18 19 12.21 -20 47 29.7           B1 125 0
12 * alf Lyr dS* 18 36 56.33635 +38 47 01.2802 0.03 0.03 0.03 0.07 0.10 A0Va 2557 0
13 GAL 029.96-00.02 Y*O 18 46 03.7 -02 39 21           ~ 341 1
14 [CKW87] 191147.3+110702 HII 19 14 08.5 +11 12 16           ~ 26 0
15 GAL 045.5+00.0 HII 19 14 20.8 +11 09 04           ~ 138 0
16 [FSH98] II NIR 19 14 20.88 +11 09 05.4           ~ 1 0
17 [FSH98] III NIR 19 14 20.98 +11 09 07.2           ~ 1 0
18 [FSH98] IV NIR 19 14 21.00 +11 09 09.0           ~ 1 0
19 [FSH98] VI NIR 19 14 21.01 +11 09 14.4           ~ 1 0
20 [FSH98] V NIR 19 14 21.01 +11 09 14.4           ~ 1 0
21 [FSH98] I NIR 19 14 21.03 +11 09 04.9           ~ 1 0
22 [FSH98] k NIR 19 14 21.08 +11 09 12.0           ~ 2 0
23 [FSH98] i NIR 19 14 21.11 +11 09 12.3           ~ 2 0
24 [FSH98] h NIR 19 14 21.15 +11 09 12.6           ~ 2 0
25 [FSH98] g NIR 19 14 21.22 +11 09 13.0           ~ 2 0
26 [FSH98] MIR 1 Y*O 19 14 21.2 +11 09 16           ~ 8 1
27 [FSH98] d NIR 19 14 21.25 +11 09 14.2           ~ 2 0
28 [FSH98] n NIR 19 14 21.25 +11 09 10.9           ~ 3 0
29 [FSH98] e NIR 19 14 21.26 +11 09 13.2           ~ 1 0
30 [FSH98] f NIR 19 14 21.26 +11 09 12.2           ~ 2 0
31 [FSH98] m NIR 19 14 21.28 +11 09 10.9           ~ 4 0
32 [GPD88] 045.454+0.060 HII 19 14 21.3 +11 09 13           ~ 151 1
33 [FSH98] c NIR 19 14 21.31 +11 09 13.2           ~ 1 0
34 [FSH98] l NIR 19 14 21.31 +11 09 10.8           ~ 4 0
35 [FSH98] o NIR 19 14 21.33 +11 09 09.9           ~ 4 0
36 [FSH98] b NIR 19 14 21.44 +11 09 12.8           ~ 2 0
37 [FSH98] a NIR 19 14 21.57 +11 09 11.7           ~ 1 0
38 HD 203856 * 21 23 35.5297106889 +40 01 07.021382015   7.33 7.21     A0V 80 0
39 * del02 Gru LP? 22 29 45.4340191 -43 44 57.196785 7.38 5.68 4.11 2.38 0.79 M4.5IIIa 72 0
40 [FSH98] MIR 2 IR ~ ~           ~ 2 0

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2021.10.21-02:03:30

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