NOAO >   Observing Info >   Approved Programs >   2010B-0203

Small NOAO Logo

Proposal Information for 2010B-0203


PI: Randall Hamper, Indiana University, rthamper@astro.indiana.edu
Address: Astronomy Department, 727 E 3rd St, Bloomington, IN 47405, USA

CoI: R. Kent Honeycutt, Indiana Univerity

Title: Discrimination among M Dwarf Dynamos Using Hyades Spectroscopy and Photometry

Abstract: We propose to obtain spectra of Hyades M dwarfs, primarily to measure the activity level from the H(alpha) strength. This data is needed as part of a concurrent photometric study of the rotational modulation of Hyades M dwarfs due to starspots. For stars with similar H(alpha) strengths, the rotational modulation due to starspots will be smaller if the active regions are more uniformly distributed. This is expected to distinguish between a solar-type large-scale (alpha)\Omega dynamo (which requires a radiative/convective interface) from a small- scale distributed dynamo, which should be able to operate in fully convective stars. Because the activity level in M dwarfs often changes on long time scales (perhaps due to activity cycles) the spectroscopy needs to be acquired within a year or two of the photometry, which will be obtained over two observing seasons 2010-12.


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 >   2010B-0203

noaoprop-help@noao.edu

Small NOAO Logo