SIMBAD references

2002A&A...388..335P - Astronomy and Astrophysics, volume 388, 335-345 (2002/6-2)

High-resolution X-ray imaging of the colliding wind shock in WR 147.


Abstract (from CDS):

We analyze new high-resolution Chandra X-ray images of the Wolf-Rayet binary system WR147. This system contains a WN8 star with an early-type companion located 0.6'' to its north, and is the only known early-type binary with a separation on the sky large enough for the wind-wind collision between the stars to currently be resolved at X-ray energies. The 5ksec Chandra HRC-I image provides the first direct evidence for spatially extended X-ray emission in an early-type binary system. The X-ray emission peaks close to the position of the radio bow shock and north of the WN8 star. A deeper X-ray image is needed to accurately determine the degree of spatial extension, to exactly align the X-ray and optical/radio frames, and to determine whether part of the detected X-ray emission arises in the individual stellar winds. Simulated X-ray images of the wind-wind collision have a FWHM consistent with the data, and maximum likelihood fits suggest that a deeper observation may also constrain the inclination and wind momentum ratio of this system. However, as the WR wind dominates the colliding wind X-ray emission it appears unlikely that {dot}(M) OB and vOB can be separately determined from X-ray observations. We also note an inconsistency between numerical and analytical estimates of the X-ray luminosity ratio of the stronger and weaker wind components, and conclude that the analytical results are in error.

Abstract Copyright:

Journal keyword(s): stars: binaries: general - stars: early-type - stars: imaging - stars: individual: WR 147 - stars: Wolf-Rayet - X-rays: stars

Nomenclature: Table 1: [PSW2002] Source N (Nos 1-2).

Simbad objects: 4

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