NOAO >   Observing Info >   Approved Programs >   2017B-0249

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Program Information for 2017B-0249


PI: Stephanie Douglas, Columbia U., stephanietdouglas@gmail.com
Address: Department of Astronomy, Mail Code 5246, 550 West 120th Street, New York, NY 10027 USA

CoI: Marcel Agueros, Columbia U.
CoI: Kevin Covey, Western Washington U.
CoI: Phillip Cargile, Harvard-Smithsonian Center for Astrophysics
CoI: Adam Kraus, U. of Texas, Austin
CoI: Natalie Gosnell, Colorado College
CoI: Andrew Mann, U. of Texas, Austin

Title: Constraining magnetic variability in the planet-hosting cluster Praesepe with simultaneous K2 and Hydra observations

Abstract: Activity tracers such as halpha and X-rays offer insight into stellar magnetic fields, particularly when compared to rotation. Studies of these phenomena are stymied, however, by single- or few-epoch surveys that fail to account for stellar variability: for example, individual M dwarfs exhibit significant scatter in halpha measurements. No survey thus far has attempted to correlate halpha and TiO, two chromospheric activity indicators, with rotational phase for more than 1-- 2 stars. To investigate how activity variability impacts inferred stellar magnetic properties, we require simultaneous spectroscopic and photometric observations of stars with a range of rotation rates. Open cluster stars are ideal for this work since the co-eval population allows us to ignore the effects of age and metallicity. {it K2} Campaign 16 will provide precise stellar light curves containing evidence of starspot asymmetries and variability for hundreds of Praesepe members. We propose to measure halpha and TiO variability simultaneously with Campaign 16 to determine how well activity tracks with rotational phase and the impact of activity scatter on the activity- rotation relation in Praesepe.

Program Type: Standard/NASA WIYN

Scheduled Nights:
Run 1 (2017B):  WIYN/HYDR -- 4n on Dec 11 - Dec 18 2017


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 >   2017B-0249

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