NOAO >   Observing Info >   Approved Programs >   2011A-0459

Small NOAO Logo

Proposal Information for 2011A-0459


PI: Abhijit Saha, NOAO, saha@noao.edu
Address: 950 N Cherry Ave, Tucson, AZ 85719, USA

CoI: Richard Wade, Pennsylvania State University
CoI: Chad Bender, Pennsylvania State University
CoI: Dianne Harmer, NOAO
CoI: Daryl Willmarth, NOAO

Title: Confirming the binarity of the RR Lyrae star TU UMa

Abstract: Evidence from existing data indicates that the RR Lyrae star TU UMa is in a binary system with an orbital period of about 23.5 years. Its companion has thus far eluded detection. This proposal seeks to verify the modeled binary system by measuring the orbital velocities during a decisive phase in the predicted orbit, and to tighten the orbital parameters. A contemporaneous proposal to HET will seek to find the secondary companion spectroscopically, and if found, to measure the velocity curve of the secondary. These efforts are in pursuit of a first measurement of a dynamical mass for an RR Lyrae star, which has obvious implications as a test of late stage stellar evolution.


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 >   2011A-0459

noaoprop-help@noao.edu

Small NOAO Logo