NOAO >   Observing Info >   Approved Programs >   2017B-0009

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Program Information for 2017B-0009


PI: Travis Metcalfe, Space Science Institute, tmetcalfe@spacescience.org
Address: Center for Extrasolar Planetary Systems, 4750 Walnut St, Suite 205, Boulder, CO 80301 USA

CoI: Ricky Egeland, HAO
CoI: Jennifer Van Saders, Carnegie Observatories
CoI: Savita Mathur, Space Science Institute

Title: Activity Cycles in Asteroseismic Solar Analogs

Abstract: The magnetic activity of the Sun becomes stronger and weaker over roughly an 11-year cycle. Decades of observations from Mount Wilson and Lowell revealed that other stars also show regular activity cycles, and identified two possible relationships between the length of the cycle and the rotation rate of the star. Neither of these relationships match the properties of the Sun, a peculiarity that demands further investigation. Recent work suggests that the Sun's rotation rate and magnetic field may be in a transitional phase that occurs in all middle- aged stars, but additional observations are needed to test this hypothesis. We propose to begin long-term monitoring of Ca~{sc ii} H~and~K emission for a sample of bright stars with known rotation rates, to identify the short activity cycles that are predecessors of the 11- year solar cycle. For most of these targets, asteroseismic masses and ages are soon expected from the Transiting Exoplanet Survey Satellite (TESS). We initially focus on 24 stars that are accessible from the south, but we will seek long-term status in 2018A for the full sample.

Program Type: Standard/LCO

Scheduled Nights:
Run 1 (2017B):  LCO-1m/NRES -- 40hrs


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



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