NOAO >   Observing Info >   Approved Programs >   2014B-0046

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Proposal Information for 2014B-0046


PI: Chien-Hsiu Lee, USM, chlee@usm.lmu.de
Address: Scheinerstr. 1, Munich, Bavaria 81679, Germany

CoI: Johannes Koppenhoefer, USM
CoI: Stella Seitz, USM
CoI: Ralf Bender, USM
CoI: Ulrich Hopp, USM
CoI: Arno Riffeser, USM
CoI: Mihael Kodric, USM
CoI: Claus Goessl, USM
CoI: Jan Snigula, USM

Title: M31 as distance anchor

Abstract: The distance of M31 plays a key role in the cosmic distance scale. Previous studies (Vilardell et al. 2010) have employed two eclipsing binary systems to directly estimate the distance to M31 with a 4% accuracy. We propose to use GMOS-N to obtain radial velocity information for additional five bright (V\le20mag) eclipsing binaries found in the PS1 Andromeda survey (PAndromeda, Lee et al. 2012). A joint analysis of the seven eclipsing binaries will reduce the uncertainty of the M31 distance to a 2% level.


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