Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2011-01-05
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
5 pages, 4 figures, Published in proceedings of "Stellar Winds in Interaction", editors T. Eversberg and J.H. Knapen. Full pro
Scientific paper
A campaign of 35 epochs of milli-arcsec resolution VLBA observations of the archetype collidingwind WR+O star binary system WR140 show the wind-collision region (WCR) as a bow-shaped arc of emission that rotates as the highly eccentric orbit progresses. The observations comprise 21 epochs from the 1993- 2001 orbit, discussed by Dougherty et al. (2005), and 14 epochs from the 2001-2009 orbit, and span orbital phase 0.43 to 0.95. Assuming the WCR is symmetric about the line-of-centres of the two stars and "points" at the WR star, this rotation shows the O star moving from SE to E of the WR star between these orbital phases. Using IR interferometry observations from IOTA that resolve both stellar components at phase 0.297 in conjunction with orbital parameters derived from radial velocity variations, the VLBA observations constrain the inclination of the orbit plane as 120{\deg}\pm4{\deg}, the longitude of the ascending node as 352{\deg}\pm2{\deg}, and the orbit semimajor axis as 9.0\pm0.1 mas. This leads to a distance estimate to WR140 of 1.81\pm0.08 kpc. Further refinements of the orbit and distance await more IR interferometric observations of the stellar components directly.
Beasley Anthony J.
Dougherty Sean M.
Trenton V.
No associations
LandOfFree
The Orbit and Distance of WR140 - Proceedings of "Stellar Winds in Interaction" 2010 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The Orbit and Distance of WR140 - Proceedings of "Stellar Winds in Interaction" 2010, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Orbit and Distance of WR140 - Proceedings of "Stellar Winds in Interaction" 2010 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-266409