NOAO >   Observing Info >   Approved Programs >   2018A-0193

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Program Information for 2018A-0193


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: Savita Mathur, Instituto de Astrofisica de Canarias
CoI: Paul Beck, Instituto de Astrofisica de Canarias
CoI: Ricky Egeland, HAO
CoI: Jennifer Van Saders, U. of Hawaii

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 distinct relationships between the length of the cycle and the rotation rate of the star. Neither of these relationships correctly describe 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 34 bright stars with known rotation rates ($P_{rm rot} < 22$ days), to identify the short activity cycles ($P_{rm cyc} < 5$ years) that are precursors 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), currently scheduled for launch in March 2018.

Program Type: Standard/Galactic

Scheduled Nights:
Run 1 (2018A):  LCO-1m/NRES -- 60hrs


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



NOAO >   Observing Info >   Approved Programs >   2018A-0193

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