MMT Hectochelle Spectral Variability of Active Late-type Stars in the Kepler Field (2013A)
Abstract
We have on-going it Kepler photometric monitoring of over 300 active late-type (mid-A - K) stars as part of our Cycles 1/2/3/4 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 140 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 800 GKM dwarf stars showing either starspot modulation from the it Kepler Team's data or from our deep XMM X-ray survey 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.
- Publication:
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NOAO Proposal
- Pub Date:
- February 2013
- Bibcode:
- 2013noao.prop..286B