NOAO >   Observing Info >   Approved Programs >   2013B-0327

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Proposal Information for 2013B-0327


PI: Idan Ginsburg, Dartmouth College, idan.ginsburg@gmail.com
Address: Physics Department, 6127 Wilder Laboratory, Hanover, NH 03755, USA

CoI: Warren Brown, Smithsonian Astrophysical Observatory
CoI: Gary Wegner, Dartmouth College

Title: Confirming Photometric Variability of Hypervelocity Stars

Abstract: "Hypervelocity stars" (HVSs) have sufficient velocity to escape the Milky Way. Initially ejected from the Galactic Center, HVSs traverse the galaxy. This allows HVSs to be used as unique probes of the dark matter distribution surrounding the Milky Way. However, we are missing a key piece of information: the nature and distance of these HVSs. This follow-up to our successful observing campaign from last year will allow us to constrain the nature of the remaining HVSs and verify the variability of five previously identified targets. In order to accomplish this goal, we request four nights on the WIYN telescope. The variability identifies the stars as being on the main sequence, and once the nature of the HVSs is determined, we can accurately calculate their distances. Such estimates will compliment our Hubble Space Telescope proper motion measurements. By knowing the HVSs' distances and full space trajectories can we firmly establish their nature, better understand the environment at the center of our galaxy, and use HVSs to help study the Milky Way's dark matter distribution.


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NOAO >   Observing Info >   Approved Programs >   2013B-0327

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