NOAO >   Observing Info >   Approved Programs >   2011A-0419

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Proposal Information for 2011A-0419


PI: Saeqa Vrtilek, Harvard-Smithsonian Center for Astrophysics, svrtilek@cfa.harvard.edu
Address: High Energy Astrophysics; Solar, Stellar, and Planetary, 60 Garden Street Mail Stop 83, Cambridge, USA

CoI: Danny Steeghs, Warwick University
CoI: Daniel Calvelo, University of Southampton

Title: Modulation tomography of the Black Hole source GRS 1716-249

Abstract: We propose observations of the black hole X-ray binary J1716-249 (V2293 Oph) in order to construct modulated tomograms in selected optical lines that will enable us to study the geometry of the accretion flow and to examine spectral signatures that differentiate between neutron stars and black holes. J1716-249 exhibits superhump modulation and related X-ray behavior that makes it a prime candidate to show disk eccentricity and significant flickering as we have observed in V616 Mon; the former provides important clues about the nature of the disk evolution in X-ray binaries and the latter allows us to test models for disk instabilities in X-ray novae. In addition to the tomograms the data will also allow us to improve the radial velocities, measure K2 from the irradiated emission lines, and refine the mass ratio by fitting the rotational broadening of the secondary.


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NOAO >   Observing Info >   Approved Programs >   2011A-0419

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