2002A&A...390..945K


C.D.S. - SIMBAD4 rel 1.7 - 2020.02.21CET11:12:35

2002A&A...390..945K - Astronomy and Astrophysics, volume 390, 945-960 (2002/8-2)

Gamma-ray line emission from OB associations and young open clusters. II. The Cygnus region.

KNOEDLSEDER J., CERVINO M., LE DUIGOU J.-M., MEYNET G., SCHAERER D. and VON BALLMOOS P.

Abstract (from CDS):

Gamma-ray and microwave observations of the Cygnus region reveal an intense signal of 1.809MeV line emission, attributed to radioactive decay of 26Al, that is closely correlated with 53GHz free-free emission, originating from the ionised interstellar medium. We modelled both emissions using a multi-wavelength evolutionary synthesis code for massive star associations that we applied to the known massive star populations in Cygnus. For all OB associations and young open clusters in the field, we determined the population age, distance, and richness as well as the uncertainties in all these quantities from published photometric and spectroscopic data. We propagate the population uncertainties in model uncertainties by means of a Bayesian method. The young globular cluster Cyg OB2 turns out to be the dominant 26Al nucleosynthesis and ionisation source in Cygnus. Our model reproduces the ionising luminosity of the Cygnus region very well, yet it underestimates 26Al production by about a factor of 2. We attribute this underestimation to shortcomings of current nucleosynthesis models, and suggest the inclusion of stellar rotation as possible mechanism to enhance 26Al production. We also modelled 60Fe nucleosynthesis in the Cygnus region, yet the small number of recent supernova events suggests only little 60Fe production. Consequently, a detection of the 1.137MeV and 1.332MeV decay lines of 60Fe from Cygnus by the upcoming INTEGRAL observatory is not expected.

Abstract Copyright:

Journal keyword(s): nuclear reactions, nucleosynthesis, abundances - open clusters and associations: general

Simbad objects: 51

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Number of rows : 51

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 NGC 3603 HII 11 15 24 -61 15.0           ~ 929 2
2 W 49a SFR 19 10 15.7 +09 06 05           ~ 256 2
3 NGC 6823 OpC 19 43 09 +23 18.0   7.71 7.1     ~ 248 2
4 Ass Vul OB 1 As* 19 44.0 +24 13           ~ 84 0
5 NAME Cyg Arm PoG 20 02 +40.0           ~ 139 0
6 C 2002+290 OpC 20 04 54 +29 13.0   10.73 10.0     ~ 32 0
7 HD 190918 WR* 20 05 57.3242972785 +35 47 18.153743699 6.11 6.88 6.75     WN5+O9I 339 0
8 NGC 6871 OpC 20 05 59 +35 46.6   5.43 5.2     ~ 194 0
9 Ass Cyg OB 3 As* 20 07 +35.9           ~ 162 0
10 Cl Biurakan 2 OpC 20 09 12 +35 29.0           ~ 36 0
11 C 2008+336 OpC 20 10 00 +33 46.0           ~ 34 0
12 HD 191765 WR* 20 10 14.1929815789 +36 10 35.069005168 7.64 8.08 8.08     WN6-s 416 0
13 HD 192103 WR* 20 11 53.5274946554 +36 11 50.523501826 7.77 8.13 8.11     WC8+OB: 315 0
14 HD 192163 WR* 20 12 06.5420067895 +38 21 17.783840972 7.12 7.49 7.50     WN6(h)-s 513 0
15 HD 192641 WR* 20 14 31.7667382048 +36 39 39.597237795 7.80 8.20 7.91     WC7+O9 302 0
16 Ass Cyg OB 8 As* 20 15 +40.9           ~ 60 0
17 IC 4996 OpC 20 16 30 +37 38.0   7.87 7.3     ~ 158 0
18 HD 193077 WR* 20 17 00.0264117871 +37 25 23.780238760 7.82 8.32 8.01 8.71   WN5-w+B? 276 0
19 Ass Cyg OB 1 As* 20 17.8 +37 38           ~ 240 1
20 HD 193576 WR* 20 19 32.4230196684 +38 43 53.958209968 8.15 8.53 8.00     WN5+O6II-V 679 0
21 Cl Berkeley 86 OpC 20 20 12 +38 41.4   8.66 7.9     ~ 104 0
22 Ass Cyg OB 9 As* 20 21 +39.9           ~ 113 0
23 HD 193928 WR* 20 21 31.7290292758 +36 55 12.769017074 10.67 10.60 9.78     WN5-w+O5V-III 185 0
24 Cl Berkeley 87 OpC 20 21 43.01 +37 22 13.8           ~ 106 0
25 WR 142 WR* 20 21 44.3438534563 +37 22 30.543604467   14.39 12.99 12.73 11.04 WO2 119 0
26 NGC 6910 OpC 20 23 08 +40 46.5   7.13 7.4     ~ 162 0
27 M 29 OpC 20 23 56 +38 31.4   7.30 6.6     ~ 218 0
28 NAME Cyg X Cld 20 28 41 +41 10.2           ~ 600 1
29 MR 110 WR* 20 32 03.0200838781 +41 15 20.497485753   15.99 13.97     WC5 71 0
30 EM* AS 422 WR* 20 32 06.2783569769 +40 48 29.521225515   13.46 11.83     WN7o/CE+O7V(f) 91 0
31 Ass Cyg OB 2 As* 20 33.2 +41 19           ~ 773 0
32 MR 112 WR* 20 35 47.0859278605 +41 22 44.703520146     12.64 12.16   WC5-6e+O8 138 1
33 C 2043+353 OpC 20 45 04 +35 30.2           ~ 11 0
34 Ass Cyg OB 7 As* 21 08 +47.6           ~ 189 0
35 NGC 7067 OpC 21 24 13 +48 01.2   10.64 9.7     ~ 45 0
36 IC 1396 OpC 21 39 00 +57 29.4           ~ 442 1
37 NGC 7128 OpC 21 43 57 +53 42.9   10.54 9.7     ~ 63 0
38 Ass Cep OB 2 As* 21 51 +60.0           ~ 277 0
39 IC 5146 SFR 21 53 24 +47 16.0   7.82 7.2     ~ 380 2
40 NGC 7160 OpC 21 53 40 +62 36.2   6.34 6.1     ~ 207 0
41 NGC 7235 OpC 22 12 25 +57 16.2   8.58 7.7     ~ 97 0
42 HD 211564 WR* 22 16 24.0322637172 +55 37 36.763974776   11.72 11.61     WN3(h)-w 111 0
43 HD 211853 WR* 22 18 45.6058273717 +56 07 33.896665584 8.84 9.39 9.00     WN6o+O6I 258 0
44 NGC 7261 OpC 22 20 07.0 +58 07 41   9.20 8.4     ~ 38 0
45 Cl Berkeley 94 OpC 22 22 57 +55 52.2   9.10 8.7     ~ 35 0
46 HD 213049 WR* 22 27 17.8189297929 +56 15 11.768608852   11.71 10.99     WC6 78 0
47 Ass Cep OB 1 As* 22 29 +56.6           ~ 80 0
48 Cl Berkeley 96 OpC 22 29 49.0 +55 23 47           ~ 23 0
49 HD 214419 WR* 22 36 53.9549498582 +56 54 20.985957352 8.68 9.21 8.80     WN6o+O9Ib/II 358 1
50 NAME I Lac As* 22 41 +38.5           ~ 143 0
51 NGC 7380 OpC 22 47 21 +58 07.9   7.62 7.2     ~ 172 0

    Equat.    Gal    SGal    Ecl

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2020.02.21-11:12:35

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