NOAO >   Observing Info >   Approved Programs >   2017B-0012

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Program Information for 2017B-0012


PI: Kevin Schlaufman, Johns Hopkins U., kschlaufman@jhu.edu
Address: Department of Physics and Astronomy, 3400 N Charles St, Baltimore, MD 21218 USA

CoI: Andrew Casey, Monash University
CoI: Ian Thompson, Carnegie Observatories

Title: A Compact Object Companion to an Ultra Metal-poor Star in the Solar Neighborhood

Abstract: We propose to use the Doppler technique on time-resolved LCO/NRES spectroscopy to infer the minimum mass of a likely compact object companion to a recently discovered ultra metal-poor star. Data already acquired suggests that the object may be a neutron star or stellar-mass black hole, but the sparse radial velocity sampling currently available does not exclude the possibility that the companion is a massive white dwarf. If the compact object is confirmed to be a neutron star or black hole, it would be among the closest known massive compact objects to the Sun. The visible ultra metal-poor star is nearby and bright enough that textit will eventually measure the inclination of the system's orbit. It will therefore be possible to measure the mass of the compact object. The low metallicity of the visible star suggests that it and the compact object likely formed in the distant past, making the unseen companion the oldest compact object in the solar neighborhood.

Program Type: Standard/LCO

Scheduled Nights:
Run 1 (2017B):  LCO-1m/NRES -- 55.3hrs


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NOAO >   Observing Info >   Approved Programs >   2017B-0012

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