NOAO >   Observing Info >   Approved Programs >   2016A-0427

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Program Information for 2016A-0427


PI: Jonathan Grindlay, Harvard-Smithsonian Center for Astrophysics, jgrindlay@cfa.harvard.edu
Address: Astronomy Department, 60 Garden St., Cambridge, Massachusetts 02138 United States

CoI: Sebastian Gomez, Harvard U.

Title: Identification of a CygX-1 Black Hole HMXB Progenitor

Abstract: We have discovered with NuSTAR that the single line spectroscopic binary (SB1) star HD96670 as reported by Strickland and Lloyd (2002; hereafter SL01) with mass function f(M) = 0.104 and binary period P = 5.52963d is an X-ray source with a power law (PL) spectrum with photon index 2.5. This NuSTAR observation was carried out to find the "missing Cyg X-1" population in the Galaxy by finding SB1 systems with mass function and K2 values that would point to a black hole secondary in the system. We propose CHIRON spectroscopy to prove it is an SB1 and ANDICAM photometry to improve our elliposoidal modulation fit. If confirmed, HD96670 will evolve into a luminous clone of CygX1 when it too becomes a super-giant. Many such systems remain to be found in the Galaxy, which will significantly alter our understanding of luminous BH vs. NS HMXBs in galaxies.

Program Type: Standard/Galactic

Scheduled Nights:
Run 1 (2016A):  CT-1.5m-SVC/CHIRON -- 30hrs
Run 2 (2016A):  CT-1.3m/ANDI -- 30hrs


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NOAO >   Observing Info >   Approved Programs >   2016A-0427

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