NOAO >   Observing Info >   Approved Programs >   2018A-0239

Small NOAO Logo

Program Information for 2018A-0239


PI: Adam Burgasser, UC San Diego, aburgasser@ucsd.edu
Address: Physics Department, UCSD Mail Code 0424, 9500 Gilman Drive, La Jolla, CA 92093 United States

CoI: Elisa Quintana, NASA Goddard Space Flight Center
CoI: Thomas Barclay, NASA Goddard Space Flight Center
CoI: Jackie Villadsen, NRAO
CoI: Steve B Howell, NASA Ames Research Center
CoI: Knicole D Colon, NASA Goddard Space Flight Center

Title: Sizing up the Coolest Stars: CHARA Observations of Wolf 359

Abstract: The lowest-mass stars and brown dwarfs span a minimum in the stellar mass-radius relationship, and thus probe hydrogen-rich stellar interiors in extreme density environments. Only two sources with masses below 0.2~M$_{odot}$ have interferometric radius measurements, while radius measurements from very low mass eclipsing binaries show remarkable scatter and divergence from model predictions. We propose an experiment to measure or constrain the radius of the well-studied M6 dwarf Wolf 359, a nearby (2.4 pc), active, metal-rich and fully-convective very low mass star which is undergoing extensive monitoring by our team with Kepler, Chandra, Swift, VLA and Las Cumbres Observatory. Current model estimates place the radius at the detection limits of CHARA+CLASSIC at $H$-band, while an inflated source would be readily resolved. We will use this source to study the role of metallicity and activity in the structures of the lowest mass stars and impacts on their planetary companions.

Program Type: Standard/Galactic

Scheduled Nights:
Run 1 (2018A):  CHARA/Classic -- 5hrs


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-0239

noaoprop-help@noao.edu

Small NOAO Logo