NOAO >   Observing Info >   Approved Programs >   2011B-0092

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Proposal Information for 2011B-0092


PI: Roger W. Romani, Stanford University, rwr@astro.stanford.edu
Address: Physics Department, MC 4060, Stanford, CA 94305-4060, USA

CoI: Matthew Kerr, Stanford University
CoI: Robin Corbet, UMBC/NASA GSFC
CoI: Richard Dubois, SLAC/KIPAC
CoI: Malcolm J. Coe, Southampton

Title: The Radial Velocity Curve of a Gamma-ray Binary

Abstract: 1FGL J1018.6-5856 has been newly discovered as an O star (gamma)- ray binary by the \it Fermi LAT. This is only the fourth such system known. The (gamma)-ray discovered orbital period, 16.6d, is also seen in X-ray monitoring observations. The next step in understanding this system is to obtain a radial velocity profile for the V 12.5 O6V companion, to help distinguish whether the compact object is a black hole or neutron star. In the likely event that the (gamma)-rays are produced by the outflow from a spin-powered neutron star, the optical Doppler study will help us understand the peculiar X-ray light curve and aid in the search for magnetospheric pulsations.


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NOAO >   Observing Info >   Approved Programs >   2011B-0092

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