2003A&A...402..653R


C.D.S. - SIMBAD4 rel 1.7 - 2021.02.26CET20:27:42

2003A&A...402..653R - Astronomy and Astrophysics, volume 402, 653-666 (2003/5-1)

XMM-Newton high-resolution X-ray spectroscopy of the Wolf-Rayet object WR 25 in the Carina OB1 association.

RAASSEN A.J.J., VAN DER HUCHT K.A., MEWE R., ANTOKHIN I.I., RAUW G., VREUX J.-M., SCHMUTZ W. and GUEDEL M.

Abstract (from CDS):

We report the analysis of the first high-resolution X-ray spectra of the Wolf-Rayet (WR) object WR25 (HD 93162, WN6ha+O4f) obtained with the reflection grating spectrometers (rgs) and the european photon imaging cameras (EPIC-MOS and PN) ccd spectrometers on board the XMM-Newton satellite. The spectrum exhibits bright emission lines of the H- and He-like ions of Ne, Mg, Si and S, as well as FeXVIII to FeXX and FeXXV lines. Line fluxes have been measured. The RGS and EPIC spectra have been simultaneously fitted to obtain self-consistent temperatures, emission measures, and elemental abundances. Strong absorption by the dense WR stellar wind and the interstellar medium (ISM) is observed equivalent to NH=7x1021.cm–2. Multi-temperature (dem) fitting yields two dominant components around temperatures of 7.0 and 32MK, respectively. The XMM intrinsic (i.e. unabsorbed, corrected for the stellar wind absorption and the absorption of ISM) X-ray luminosity of WR25 is Lx(0.5-10keV)=1.3x1034erg/s, and Lx(0.5-10keV)=0.85x1034erg/s, (when correcting for the ISM only) assuming d=3.24kpc. The obtained chemical abundances are subsolar, except for S. This may be real, but could equally well be due to a weak coupling to the continuum, which is strongly influenced by the absorption column density and the subtracted background. The expected high N-abundance, as observed in the optical wavelength region, could not be confirmed due to the strong wind absorption, blocking out its spectral signature. The presence of the FeXXV emission-line complex at ∼6.7keV is argued as being indicative for colliding winds inside a WR+O binary system.

Abstract Copyright:

Journal keyword(s): stars: individual: WR 25 - stars: early-type - stars: Wolf-Rayet - stars: binaries: general - stars: abundances - X-rays: stars

Simbad objects: 26

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Number of rows : 26

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 * del Ori Al* 05 32 00.40009 -00 17 56.7424 0.96 2.02 2.41 2.32 2.54 B0III+O9V 750 0
2 * lam Ori ** 05 35 08.27761 +09 56 02.9611 2.45 3.48 3.66 3.72 3.89 O8IIIf+B0.5V 273 0
3 * tet01 Ori C ** 05 35 16.4664092288 -05 23 22.897102710 4.20 5.15 5.13 4.91 4.73 O7Vp 1294 1
4 * iot Ori SB* 05 35 25.9819073 -05 54 35.643537 1.45 2.53 2.77     O9IIIvar 737 0
5 * zet Ori A ** 05 40 45.527143 -01 56 33.26036   1.79 1.90     O9.2IbvarNwk 647 0
6 HD 50896 WR* 06 54 13.0440847499 -23 55 42.020318514 5.74 6.63 6.91 7.74   WN4b 748 0
7 * 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
8 * gam02 Vel WR* 08 09 31.95013 -47 20 11.7108 0.64 1.58 1.83 1.85 2.00 WC8+O7.5III-V 853 0
9 Ass Car OB 1 As* 10 38 -59.0           ~ 146 0
10 HD 92740 WR* 10 41 17.5154230335 -59 40 36.897706569 5.68 6.50 6.42 7.38   WN7h+O9III-V 385 0
11 HD 93131 WR* 10 43 52.2575981063 -60 07 04.016913264 5.52 6.43 6.48 7.46   WN6ha-w 280 0
12 HD 93129 ** 10 43 57.486 -59 32 51.44 6.26 7.06 6.90     O2If*+O3.5V((f)) 190 1
13 HD 93162 WR* 10 44 10.3888220947 -59 43 11.105959983 7.90 8.55 8.80 8.66   O2.5If*/WN6+OB 341 1
14 V* V560 Car SB* 10 44 33.7392630703 -59 44 15.434160993 6.89 7.80 7.75 7.56 7.46 O3.5V((f))+O8V 282 0
15 HD 93250 * 10 44 45.0270200315 -59 33 54.681395850 6.73 8.12 7.50 8.38   O4III(fc) 294 0
16 * eta Car Em* 10 45 03.5455050 -59 41 03.951060 6.37 7.034 6.21 4.90 4.41 OBepec 2254 0
17 HD 93403 SB* 10 45 44.1189478816 -59 24 28.162328313 6.72 8.46 8.27 8.35   O5.5III(fc)var 183 1
18 Cl* NGC 3603 MDS C WR* 11 15 07.59 -61 15 38.0   12.94 11.89     WN6h 40 0
19 NGC 3603 OpC 11 15 18.6 -61 15 26           ~ 970 1
20 * tau Sco * 16 35 52.9528530 -28 12 57.661515 1.55 2.56 2.81 2.93 3.18 B0.2V 865 0
21 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
22 * 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
23 HD 165688 WR* 18 07 56.9612003141 -19 23 56.866361615 10.46 10.31 9.87 9.85   WN5-6b 147 0
24 HD 193576 WR* 20 19 32.4230196684 +38 43 53.958209968 8.15 8.53 8.00     WN5+O6II-V 687 0
25 HD 193793 WR* 20 20 27.9763345925 +43 51 16.289775091 6.90 7.25 6.85 4.58   WC7p+O5 657 1
26 EM* AS 431 WR* 20 36 43.6345223872 +40 21 07.453291511     13.73 12.51   WN8(h)+B0.5V 212 0

    Equat.    Gal    SGal    Ecl

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