2005A&A...437.1029D


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.02CET12:35:28

2005A&A...437.1029D - Astronomy and Astrophysics, volume 437, 1029-1046 (2005/7-3)

An XMM-Newton observation of the multiple system HD 167971 (O5-8V + O5-8V + (O8I)) and the young open cluster NGC 6604.

DE BECKER M., RAUW G., BLOMME R., PITTARD J.M., STEVENS I.R. and RUNACRES M.C.

Abstract (from CDS):

We discuss the results of two XMM-Newton observations of the open cluster NGC 6604 obtained in April and September 2002. We concentrate mainly on the multiple system HD 167971 (O5-8V+O5-8V+(O8I)). The soft part of the EPIC spectrum of this system is thermal with typical temperatures of about 2x106 to 9x106K. The nature (thermal vs. non-thermal) of the hard part of the spectrum is not unambiguously revealed by our data. If the emission is thermal, the high temperature of the plasma (∼2.3x107 to 4.6x107K) would be typical of what should be expected from a wind-wind interaction zone within a long period binary system. This emission could arise from an interaction between the combined winds of the O5-8V+O5-8V close binary system and that of the more distant O8I companion. Assuming instead that the hard part of the spectrum is non-thermal, the photon index would be rather steep (∼3). Moreover, a marginal variability between our two XMM-Newton pointings could be attributed to an eclipse of the O5-8V+O5-8V system. The overall X-ray luminosity points to a significant X-ray luminosity excess of about a factor 4 possibly due to colliding winds. Considering HD 167971 along with several recent X-ray and radio observations, we propose that the simultaneous observation of non-thermal radiation in the X-ray (below 10.0keV) and radio domains appears rather unlikely. Our investigation of our XMM-Newton data of NGC 6604 reveals a rather sparse distribution of X-ray emitters. Including the two bright non-thermal radio emitters HD 168112 and HD 167971, we present a list of 31 X-ray sources along with the results of the cross-correlation with optical and infrared catalogues. A more complete spectral analysis is presented for the brightest X-ray sources. Some of the members of NGC 6604 present some characteristics suggesting they may be pre-main sequence star candidates.

Abstract Copyright:

Journal keyword(s): radiation mechanisms: non-thermal - stars: early-type - stars: individual: HD 167971 - stars: winds, outflows - X-rays: stars

Nomenclature: Table 6: [DRB2005] NN (Nos 1-31).

Simbad objects: 49

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Number of rows : 49

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 * zet Pup BY* 08 03 35.04754 -40 00 11.3321 0.89 1.98 2.25 2.36 2.58 O4I(n)fp 1106 1
2 * mu. Nor s*b 16 34 05.0202815 -44 02 43.128156 4.05 4.99 4.94 6.36   O9.7Iab 261 0
3 * tau Sco * 16 35 52.9528530 -28 12 57.661515 1.55 2.56 2.81 2.93 3.18 B0.2V 865 0
4 NGC 6231 OpC 16 54 08.51 -41 49 36.0   2.83 2.6     ~ 491 0
5 HD 152248 bL* 16 54 10.0614779606 -41 49 30.143138696 5.56 6.15 6.088     O7Iabf+O7Ib(f) 234 0
6 HD 159176 SB* 17 34 42.4926595872 -32 34 53.964439199 4.88 5.74 5.70 7.19   O7V((f))+O7V((f)) 243 0
7 NGC 6383 OpC 17 34 48 -32 34.0   5.56 5.5     ~ 141 0
8 * 9 Sgr Em* 18 03 52.4455370104 -24 21 38.639393923 5.08 5.97 5.97 5.72 5.70 O4V((f))z 521 0
9 HD 165688 WR* 18 07 56.9612003141 -19 23 56.866361615 10.46 10.31 9.87 9.85   WN5-6b 147 0
10 HD 167834 * 18 17 31.4959069310 -12 06 17.971650653 10.33 10.61 9.65 9.77   B 24 0
11 XMMU J181746.1-120542 X 18 17 46.1 -12 05 42           ~ 1 0
12 GSC2 S300122015025 * 18 17 50.6316949647 -12 05 05.384764200   18.7 16.3     ~ 1 0
13 GSC2 S3001220900 * 18 17 50.6757743886 -12 03 58.878514252   14.4 13.3     ~ 1 0
14 LBN 018.45+01.87 HII 18 17 52.5 -11 40 58           ~ 53 1
15 Ass Ser OB 2 As* 18 18 -12.3           ~ 60 0
16 NGC 6604 OpC 18 18 03 -12 14.5           ~ 122 0
17 HD 167971 s*b 18 18 05.8954978252 -12 14 33.324312346 7.89 8.27 7.50 6.68 6.279 O8Iaf(n)+O4/5 276 0
18 XMMU J181808.4-120824 X 18 18 08.4 -12 08 25           ~ 1 0
19 XMMU J181808.6-120851 X 18 18 08.6 -12 08 51           ~ 1 0
20 BD-12 4982 * 18 18 09.8900857259 -12 10 47.169029143 9.51 9.93 9.26 9.66   OB 46 0
21 GSC2 S300122015589 * 18 18 10.5725911243 -12 04 07.845527170   16.8 15.3     ~ 1 0
22 XMMU J181813.1-121503 X 18 18 13.1 -12 15 03           ~ 1 0
23 GSC2 S300122011032 X 18 18 15.2238593373 -12 11 48.201961849           ~ 2 0
24 XMMU J181815.7-120842 X 18 18 15.7 -12 08 43           ~ 1 0
25 XMMU J181816.9-121617 X 18 18 16.9 -12 16 17           ~ 1 0
26 Cl* NGC 6604 FD 61 * 18 18 19.2882984649 -12 16 10.096102471 12.82 12.52 12.35     ~ 8 0
27 XMMU J181819.3-121616 X 18 18 19.3 -12 16 17           ~ 1 0
28 USNO-B1.0 0777-00544362 X 18 18 20.5308509085 -12 17 35.536377371           ~ 1 0
29 XMMU J181822.6-121503 X 18 18 22.6 -12 15 03           ~ 1 0
30 [DRB2005] 17 X 18 18 23.2908795860 -12 07 19.036010572           ~ 1 0
31 XMMU J181827.3-120613 X 18 18 27.305 -12 06 13.35           ~ 1 0
32 XMMU J181830.3-121359 X 18 18 30.20 -12 13 58.3           ~ 1 0
33 USNO-B1.0 0777-00545111 * 18 18 31.93 -12 17 43.1   19.4 17.6     ~ 1 0
34 USNO-B1.0 0777-00545104 X 18 18 32.0 -12 17 40   18.9 17.7     ~ 1 0
35 XMMU J181832.1-121605 X 18 18 32.1 -12 16 05           ~ 1 0
36 XMMU J181837.1-120601 X 18 18 37.1 -12 06 02   16.2 15.6     ~ 1 0
37 XMMU J181839.5-120935 X 18 18 39.5 -12 09 35   14.5 13.8     ~ 1 0
38 HD 168112 ** 18 18 40.8671023267 -12 06 23.366098112 8.81 9.21 8.52 9.24   O5III(f) 138 0
39 [DRB2005] 25 X 18 18 44.33 -12 07 52.4           ~ 2 0
40 XMMU J181901.2-120050 X 18 19 01.14 -12 00 49.9   18.5 16.6     ~ 1 0
41 BD-12 4994 * 18 19 02.9737793494 -12 06 36.109779711 10.12 10.47 9.81 9.96   OB 31 0
42 [DRB2005] 28 X 18 19 04.8117551773 -12 09 20.217991570           ~ 1 0
43 USNO-B1.0 0779-00532614 X 18 19 05.1304211745 -12 03 06.150962723           ~ 1 0
44 USNO-B1.0 0779-00532625 * 18 19 05.4184155192 -12 03 08.456253465     18.6     ~ 1 0
45 USNO-B1.0 0778-00546278 X 18 19 06.8 -12 10 18           ~ 1 0
46 XMMU J181909.9-121753 X 18 19 09.95 -12 17 52.3           ~ 1 0
47 HD 193576 WR* 20 19 32.4230196684 +38 43 53.958209968 8.15 8.53 8.00     WN5+O6II-V 687 0
48 Ass Cyg OB 2 As* 20 33.2 +41 19           ~ 819 0
49 BD+40 4227A SB* 20 33 15.0780900764 +41 18 50.478859468 10.42 10.27 8.98 8.03 6.83 O6Ib(fc)+O4.5:III:(fc) 220 0

    Equat.    Gal    SGal    Ecl

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2021.03.02-12:35:28

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