NOAO >   Observing Info >   Approved Programs >   2011B-0309

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Proposal Information for 2011B-0309


PI: Alexander Brown, University of Colorado, Alexander.Brown@colorado.edu
Address: Center for Astrophysics and Space Astronomy (CASA), 593 UCB, Boulder, CO 80309-0593, USA

CoI: Lucianne Walkowicz, University of California - Berkeley
CoI: Suzanne Hawley, University of Washington
CoI: Adam Kowalski, University of Washington
CoI: Larry Ramsey, Pennsylvania State University
CoI: Steven Saar, CfA
CoI: Gabor Furesz, CfA

Title: MMT Hectochelle Spectral Variability Study of Active Late-type Stars in the Kepler Field (2011B)

Abstract: We have on-going \it Kepler photometric monitoring of over 200 active late-type (mid-A - K) stars as part of Cycles 1/2/3 Guest Observer (GO) programs with the aim of studying starspot evolution, differential rotation, activity cycles, and flares. We propose to use the MMT Hectochelle multiobject spectrograph to observe over 120 of these stars to determine a range of basic physical properties for the stars, such as radial velocity variations due to binarity, chromospheric activity levels from Ca II H+K and H(alpha), projected rotational velocities for comparison to the rotational periods measured directly by \it Kepler, age/youth as indicated by Li I, and better effective temperature and luminosity estimates. In addition, to provide a superior sample for statistical studies another ~1,000 GKM dwarf stars showing starspot modulation from the \it Kepler Team's data will be observed using the unassigned fibers in each field. These measurements require the 32,000 spectral resolution provided by Hectochelle, which is hard to obtain efficiently for 13-15th magnitude stars any other way.


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