NOAO >   Observing Info >   Approved Programs >   2008B-0482

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Proposal Information for 2008B-0482


PI: Armin Rest, Harvard University, arest@physics.harvard.edu
Address: Physics Department, 17 Oxford Street, Cambridge, MA 02138, USA

CoI: Doug Welch, McMaster University
CoI: Nicholas Suntzeff, Texas A&M
CoI: Mark E. Huber, JHU
CoI: Guillermo Damke, CTIO
CoI: Sean Points, CTIO
CoI: Kem H. Cook, LLNL

Title: Geometric Distances to Cepheids with Light Echoes

Abstract: We propose the search for light echoes around Galactic Cepheids. Light echoes offer the opportunity to determine the geometrical distance to the source of the light echoes. Cepheids are a key step in the extra- galactic distance ladder, and the distance determination with light echoes is independent of other methods. We propose to use the SOI on SOAR to monitor 7 Cepheids with variability (Delta) M>0.5 mag, some with unknown IR excess and with certain IR excess.


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NOAO >   Observing Info >   Approved Programs >   2008B-0482

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