2011A&A...525A...1P


Query : 2011A&A...525A...1P

2011A&A...525A...1P - Astronomy and Astrophysics, volume 525A, 1-1 (2011/1-1)

The distant young embedded stellar cluster CBJC 8 associated with G085.40-0.00.

PERSI P., TAPIA M. and GOMEZ M.

Abstract (from CDS):

The infrared cluster CBJC 8 is associated with a 6.7GHz methanol maser and a compact radio-continuum source, G85.40-0.00. It is located at a distance of about 8kpc. The aim is to study the characteristics of this distant and compact embedded cluster and derive the properties of its stellar population. We present new ground-based near- and mid-infrared imaging observations of this region. The calibrated images were analysed together with archive Spitzer IRAC images. Based on the discovery of a considerable fraction of embedded sources with infrared excess emission that are concentrated within a radius around 16" centred near the position of the compact HII region G85.40-0.00, we were able to confirm the presence of a very young embedded cluster. It was found to contain more than 58 members brighter than MK=2.6, two-thirds of which showing significant near- or mid-IR excess emission. We present spectral energy distributions and extrapolated total luminosities for nine sources with large mid-infrared excesses that were measured in all four IRAC bands. For the brightest of these, G8540A, which is associated with a methanol maser and a compact HII region, we fitted a model of an infalling envelope plus disc plus central star to its observed 1.6 to 850µm fluxes to get an idea of its physical properties. We also report a single 2.12µm molecular hydrogen line emission knot near the centre of the cluster, which support the idea about an outflow activity.

Abstract Copyright:

Journal keyword(s): stars: formation - HII regions - ISM: clouds - masers - stars: protostars - ISM: jets and outflows

VizieR on-line data: <Available at CDS (J/A+A/525/A1): jhk.dat irac.dat>

Nomenclature: Fig. 2, Paragr. 2.1: [PTG2011] H2 knot N=1. Fig. 4, Tables 2-3: [PTG2011] A (Nos A-H, J, N). Table 2: [PTG2011] NN (Nos 1-44). jhk: [PTG2011] JHK JHHMMSS.ss+DDMMSS.s N=393. irac: [PTG2011] IRAC JHHMMSS.ss+DDMMSS.s N=32.

Status at CDS : All or part of tables of objects could be ingested in SIMBAD with priority 2.

Simbad objects: 56

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Number of rows : 56
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 * bet And PM* 01 09 43.92388 +35 37 14.0075 5.58 3.62 2.05 0.81 -0.19 M0+IIIa 556 1
2 NAME Per Arm PoG 03 30 +45.0           ~ 1528 0
3 * alf Lyr dS* 18 36 56.33635 +38 47 01.2802 0.03 0.03 0.03 0.07 0.10 A0Va 2694 1
4 * gam Aql * 19 46 15.5789542266 +10 36 47.731401477 5.93 4.23 2.72 1.65 0.87 K3II 442 0
5 IC 5070 HII 20 51.0 +44 22           ~ 210 1
6 [PTG2011] 1 IR 20 54 12.16 +44 54 15.8           ~ 1 0
7 [PTG2011] 2 IR 20 54 12.78 +44 54 08.1           ~ 1 0
8 [PTG2011] 3 IR 20 54 12.96 +44 54 07.1           ~ 1 0
9 [PTG2011] 4 IR 20 54 13.13 +44 54 07.3           ~ 1 0
10 [PTG2011] 5 IR 20 54 13.40 +44 54 00.0           ~ 1 0
11 [PTG2011] 6 IR 20 54 13.47 +44 54 08.6           ~ 1 0
12 [PTG2011] 7 IR 20 54 13.49 +44 54 07.1           ~ 1 0
13 [PTG2011] 8 IR 20 54 13.50 +44 54 17.4           ~ 1 0
14 [PTG2011] 9 IR 20 54 13.51 +44 54 13.7           ~ 1 0
15 [PTG2011] 11 IR 20 54 13.60 +44 54 01.9           ~ 1 0
16 [PTG2011] 10 IR 20 54 13.60 +44 54 07.7           ~ 1 0
17 [PTG2011] 12 IR 20 54 13.70 +44 54 06.5           ~ 1 0
18 [ABB2014] WISE G085.410+00.003 HII 20 54 13.7 +44 54 08           ~ 3 1
19 [PMB2005] CH3OH 085.40-00.00 Mas 20 54 13.710 +44 54 07.85           ~ 4 0
20 [PTG2011] 13 IR 20 54 13.75 +44 54 05.7           ~ 1 0
21 [PTG2011] 14 IR 20 54 13.82 +44 54 08.6           ~ 1 0
22 [PTG2011] 15 IR 20 54 13.83 +44 54 14.8           ~ 1 0
23 [PTG2011] 16 IR 20 54 13.85 +44 54 07.0           ~ 1 0
24 [PTG2011] 17 IR 20 54 13.91 +44 54 06.3           ~ 1 0
25 [PTG2011] 18 IR 20 54 13.91 +44 54 21.6           ~ 1 0
26 [PTG2011] 19 IR 20 54 13.94 +44 54 13.5           ~ 1 0
27 [PTG2011] 20 IR 20 54 13.95 +44 54 05.4           ~ 1 0
28 [PTG2011] 21 IR 20 54 14.06 +44 54 12.4           ~ 1 0
29 [PTG2011] 22 IR 20 54 14.07 +44 53 59.9           ~ 1 0
30 [PTG2011] 23 IR 20 54 14.07 +44 54 08.3           ~ 1 0
31 [PTG2011] 24 IR 20 54 14.14 +44 54 08.8           ~ 1 0
32 [PTG2011] 25 IR 20 54 14.19 +44 54 13.9           ~ 1 0
33 [PTG2011] 26 IR 20 54 14.31 +44 54 12.8           ~ 1 0
34 [PTG2011] 27 IR 20 54 14.34 +44 54 04.6           ~ 1 0
35 [PTG2011] 28 IR 20 54 14.36 +44 53 57.3           ~ 1 0
36 [PTG2011] 29 IR 20 54 14.37 +44 54 10.9           ~ 1 0
37 [PTG2011] 30 IR 20 54 14.40 +44 53 34.2           ~ 1 0
38 [PTG2011] H2 knot IR 20 54 14.45 +44 54 00.0           ~ 1 0
39 [PTG2011] 31 IR 20 54 14.46 +44 54 04.8           ~ 1 0
40 [PTG2011] 32 IR 20 54 14.50 +44 53 56.7           ~ 1 0
41 [BDB2003] G085.41+00.00 OpC 20 54 14.5242 +44 54 07.803           ~ 14 0
42 2MASS J20541457+4453394 Y*? 20 54 14.575 +44 53 39.42           ~ 3 0
43 [PTG2011] 34 IR 20 54 14.60 +44 53 59.4           ~ 1 0
44 [PTG2011] 35 IR 20 54 14.61 +44 53 52.8           ~ 1 0
45 [PTG2011] 36 IR 20 54 14.81 +44 54 03.2           ~ 1 0
46 [PTG2011] 37 IR 20 54 14.83 +44 54 16.2           ~ 1 0
47 [PTG2011] 38 IR 20 54 14.85 +44 54 11.3           ~ 1 0
48 [PTG2011] 39 IR 20 54 14.88 +44 54 15.2           ~ 1 0
49 [PTG2011] 40 IR 20 54 14.89 +44 54 14.0           ~ 1 0
50 [PTG2011] 41 IR 20 54 15.04 +44 53 54.8           ~ 1 0
51 [PTG2011] 42 IR 20 54 15.17 +44 54 02.2           ~ 1 0
52 [PTG2011] 43 IR 20 54 15.49 +44 54 42.1           ~ 1 0
53 [PTG2011] 44 IR 20 54 15.95 +44 54 30.7           ~ 1 0
54 NGC 7000 Cl* 20 58 47 +44 19.8           ~ 402 0
55 * mu. Cep s*r 21 43 30.4595558543 +58 46 48.165937434 8.85 6.43 4.08 1.98 0.22 M2-Ia 673 1
56 * bet Peg LP* 23 03 46.45746 +28 04 58.0336 6.05 4.09 2.42 0.92 -0.40 M2.5II-III 594 1

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