NOAO >   Observing Info >   Approved Programs >   2012B-0430

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Proposal Information for 2012B-0430


PI: Ping Zhao, Harvard-Smithsonian Center for Astrophysics, zhao@cfa.harvard.edu
Address: High Energy Astrophysics Division, 60 Garden St, Cambridge, MA 02138, USA

CoI: Jonathan E. Grindlay, Harvard-Smithsonian Center for Astrophysics
CoI: Jae Sub Hong, Harvard-Smithsonian Center for Astrophysics
CoI: Mathieu Servillat, CEA Saclay, France
CoI: Maureen van den Berg, Utrecht University, 3508 TC Utrecht, The Netherlands
CoI: Silas Laycock, University of Massachusetts, Lowell

Title: The Mass Function of a New Candidate of Quiescent Low-Mass X-ray Binary

Abstract: We propose to complete the project we started last year - to explore a new method in searching for qLMXBs in their quiescent states. We were granted 3 nights CTIO 4m/Hydra time in 2012A, but our time was lost due to the 4m F/8 secondary incident. Here we propose to use GMOS- S to complete this project. Our target is a new candidate qLMXB with a confirmed orbital period of ~5.7 days. We propose to measure its radial velocity using the GMOS-S, and obtain more photometry data using the CTIO 1.3-m to accurately measure its orbital period and inclination, and therefore determine its mass function. If confirmed, it will be the first qLMXB ever discovered in quiescent state and in a targeted survey. This will open the door to a new way to search for accretion binaries hidden in the Galaxy. We choose the most relaxed observing constraints and ask minimum telescope time for a possible very high scientific return.


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