Motion of the Colliding-wind Region in WR140

https://www.nrao.edu/archives/plugins/Dropbox/files/wr140_hi.jpg

Description

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).

Creator

Legacy Astronomical Images

Rights

NRAO/AUI/NSF does not hold full copyright for this image. Contact the archivist for details.

Type

Legacy Astronomical Image

Object Name

WR140

Photo Credit

Image courtesy of NRAO/AUI/NSF

Investigators

Sean Dougherty, Tony Beasley, Mark Claussen, Ashley Zauderer, Nick Bolingbroke

Telescope

Very Long Baseline Array (VLBA)

Observation Date

2000-01-01

Type of Observation

continuum

Band

X

Wavelength

3.6 cm

Frequency

8.4 GHz

Center of Image

RA 20:20:27.977, Dec: 43:51:16.292 (J2000)

Field of View

0.000004 x 0.000003 degrees

Notes

Contact the archivist for a high resolution tif of this image.

Series

Galactic Sources Series

Unit

Star Forming Regions Unit

Citation

Legacy Astronomical Images, “Motion of the Colliding-wind Region in WR140,” NRAO Archives, accessed December 3, 2021, https://www.nrao.edu/archives/items/show/33479.