NOAO >   Observing Info >   Approved Programs >   2017B-0088

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Program Information for 2017B-0088


PI: Noel Richardson, U. of Toledo, noel.richardson@UToledo.edu
Address: Ritter Observatory, 2801 W Bancroft, MS 113, Toledo, OH 43606 United States

CoI: Anthony Moffat, University of Montreal
CoI: Peredur Williams, University of Edinburgh
CoI: Tomer Shenar, Universitat Potsdam
CoI: Nicole St-Louis, University of Montreal

Title: Weighing Evolved Massive Stars in Binary systems with Interferometry

Abstract: WR stars may be the progenitors of type Ib and Ic supernovae. However, very few WR stars have directly measured masses, leaving the end-stages of the evolution of massive stars unconstrained. We propose to use the CHARA Array to measure the binary positions of two long- period WR+O binaries, essentially doubling the number of WR binaries with visual orbits. We previously resolved both of these systems with CHARA, and now require long-term monitoring in order to constrain the orbital elements. These results will be combined with double-lined spectroscopic orbits to determine masses directly. Such measurements in long-period binaries provide direct constraints to the evolution of single stars as these systems likely have not interacted in their past.

Program Type: Long Term/Galactic

Scheduled Nights:
Run 1 (2017B):  CHARA/Climb -- 20hrs
Run 1 (2018A):  CHARA/Climb -- 20hrs


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



NOAO >   Observing Info >   Approved Programs >   2017B-0088

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