2006A&A...445.1093P


C.D.S. - SIMBAD4 rel 1.7 - 2019.11.20CET17:02:25

2006A&A...445.1093P - Astronomy and Astrophysics, volume 445, 1093-1097 (2006/1-3)

Evidence for colliding winds in WR 25 from XMM-Newton observations of X-ray variability.

POLLOCK A.M.T. and CORCORAN M.F.

Abstract (from CDS):

The Wolf-Rayet star WR 25 in the Carina Nebula is a surprisingly bright X-ray source, and amongst the brightest WR stars in X-rays. It is a suspected binary star, though its binary nature has been a matter of controversy. We report here observations of WR 25 from the XMM-Newton archive which showed an increase in X-ray luminosity of more than a factor of two. The X-ray absorption also increased. Such a large change in X-ray output is unknown in single massive stars, though large changes in X-ray brightness are seen in binaries. The most likely explanation of the observed X-ray variability is as a result of colliding-wind emission in a moderately eccentric binary with a period of about 4 years. The next periastron passage is expected in 2007. The X-ray spectrum is similar to that of the archetype colliding-wind binary WR 140.

Abstract Copyright:

Journal keyword(s): X-rays: stars - stars: Wolf-Rayet - stars: individual: WR 25 - stars: winds, outflows - stars: binaries: general

Simbad objects: 4

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Number of rows : 4

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 HD 93162 WR* 10 44 10.3888220947 -59 43 11.105959983 7.90 8.55 8.80 8.66   O2.5If*/WN6+OB 328 1
2 NGC 3372 HII 10 44 19.0 -59 53 21           ~ 869 2
3 * eta Car Em* 10 45 03.5455050 -59 41 03.951060 6.37 7.034 6.21 4.90 4.41 OBepec 2154 0
4 HD 193793 WR* 20 20 27.9763345925 +43 51 16.289775091 6.90 7.25 6.85 4.58   WC7p+O5 641 1

    Equat.    Gal    SGal    Ecl

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2019.11.20-17:02:25

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