NOAO >   Observing Info >   Approved Programs >   2016B-0122

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Program Information for 2016B-0122


PI: Tiffany D Pewett-Clements, Georgia State U., pewett@astro.gsu.edu
Address: Physics Department, 25 Park Place S, Suite 605, Atlanta, GA 30303 USA

CoI: Todd Henry, Georgia State U.
CoI: Michele Silverstein, Georgia State U.

Title: Deciphering the Wide Low Mass Main Sequence

Abstract: With a carefully vetted database of several thousand stars within 25pc compiled by the RECONS team we have mapped the H-R Diagram with high precision. There is significant widening of the main sequence for stars with types M0V--M5V. These low mass stars that comprise at least 75% of the stellar population in the Milky Way (Henry et al. 2006) are difficult to study due to their intrinsic faintness and complexity. Their complexity gives rise to the astrophysical mystery of the cause of the widening of the main sequence by more than four full magnitudes in $M_V$ for stars of a given color, or temperature. This corresponds to a spread in luminosity of $>$16, implying that some M dwarfs are four or more times larger than their counterparts. The PI's thesis consists of astrometric, photometric, and spectroscopic techniques to unravel the mystery of what effects age, activity, and metallicity have on the sizes of red dwarfs. Here we propose for seven nights on the CTIO/SMARTS 0.9m telescope to make our final photometric observations of southern red dwarfs that will help to understand the effects of magnetic activity on the main sequence widening.

Program Type: Standard/Galactic

Scheduled Nights:
Run 1 (2016B):  CT-0.9m/CFIM -- 7n on Oct 26 - Nov 01 2016


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 >   2016B-0122

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