NOAO >   Observing Info >   Approved Programs >   2012A-0226

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Proposal Information for 2012A-0226


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, Harvard-Smithsonian Center for Astrophysics
CoI: Maureen van den Berg, Utrecht University, 3508 TC Utrecht, The Netherlands
CoI: Jifeng Liu, Harvard-Smithsonian Center for Astrophysics

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. Last year we proposed to simultaneously observe the orbital variation and radial velocity of a new candidate qLMXB, selected in our ChaMPlane survey. NOAO granted us photometry time only to first ``confirm it is an ellipsoidal binary'' to ``strengthen the case''. We successfully conducted this observation with the CTIO 1m in June 2011. The results show that this source is an ellipsoidal binary with an orbital period of ~5.7 days. We propose to complete this project by measuring the radial velocity of the object using the CTIO 4-m, 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.


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NOAO >   Observing Info >   Approved Programs >   2012A-0226

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