NOAO >   Observing Info >   Approved Programs >   2013A-0141

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Proposal Information for 2013A-0141


PI: Carl Melis, UC San Diego, cmelis@ucsd.edu
Address: Center for Astrophysics and Space Sciences, CASS 0424 9500 Gilman Dr., La Jolla, CA 92093-0424, USA

CoI: Mark Reid, Harvard/CfA
CoI: John Stauffer, IPAC/Caltech
CoI: Amy Mioduszewski, NRAO

Title: Toward a Resolution of the Pleiades Distance Controversy

Abstract: The Pleiades open cluster serves as a cornerstone for programs which use main-sequence fitting to derive distances. This role is called into question by the ``Pleiades distance controversy". We are using very- long baseline radio interferometry (VLBI) to derive a new, independent trigonometric parallax distance to the Pleiades. Many of our VLBI targets appear to have binary-induced astrometric motion and the VLBI data alone do not allow robust combined orbital and parallax fits. We request Keck adaptive optics time to detect or constrain binary companions to our VLBI targets and thus provide valuable orbital priors to our astrometric fits.


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



NOAO >   Observing Info >   Approved Programs >   2013A-0141

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