The motion of the colliding-wind region in WR140

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About this Image

Montage of three epochs of VLBA phase-referenced imaging of the archetype WR+O star colliding-wind binary system. The bright radio emission arises from the region where the stellar winds of the two masssive stars collide. The images are superimposed on an orbit derived using 23 epochs of VLBA images, including the relative position of the two stars at the three observation epochs. The observations show that the wind-collision region is bow-shaped, as anticipated from theory. The proper motion and rotation of the wind-collision region is also clear, along with the decay of the radio emission as the two stars close in on periastron (position of closet approach).

Investigator(s):  Sean Dougherty, Tony Beasley, Mark Claussen, Ashley Zauderer, Nick Bolingbroke

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Technical Data

    Telescope VLBA 
    Date of Observation 2000-01-01 
    Type of Observation Continuum Observations 
    Band X 
    Wavelength 3.6 cm 
    Frequency 8.4 GHz 
    Center of Image RA: 20:20:27.98, Dec: 43:51:16.29 (J2000)  
    Field of View 0.0000 x 0.0000 degrees  

  • Astronomical database entries for WR140
    • Query SIMBAD for more WR140 data


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