NOAO >   Observing Info >   Approved Programs >   2017A-0320

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Program Information for 2017A-0320


PI: Michele Silverstein, Georgia State U., silverstein@astro.gsu.edu
Address: Physics Department, 25 Park Place NE, Suite 605, Atlanta, GA 30303 USA

CoI: Todd Henry, RECONS Institute
CoI: Jao Wei-Chun, Georgia State U.
CoI: Adric R Riedel, California Institute of Technology

Title: Sizing Up Northern Red Dwarfs in the Solar Neighborhood

Abstract: As part of the PI's PhD thesis, we wish to gather high-quality absolute $VRI$ photometry of 585 northern red dwarfs that have parallaxes placing them within 25 parsecs. Using a chi-squared spectral energy distribution (SED) fit of $VRI$, 2MASS, and WISE data to the BT- Settl model grid, radii and other fundamental properties will be determined for a total of 1874 red dwarf primaries over the entire sky. The optical data from this program are critical to the convergence of our fits for the northern part of the sample. Stellar radii are valuable in their own right for constraining star formation and evolution models and are required in order to determine transiting planet radii. These radii also allow us to identify young/old stars via their correspondingly large/small radii. In fact, radii for these stars can be used as proxies to map stellar ages for stars in the solar neighborhood from which we can piece together our Galaxy's history. The entire sample will also be checked for mid-IR excesses from the WISE data indicative of brown dwarf companions or circumstellar disks --- young stars in particular will be the focus of this disk check. They are the most likely candidates to exhibit mid-infrared excesses. Identification of new disks of material around nearby young stars is especially useful for constraining models of star and planet formation and for identifying targets for planet searches.

Program Type: Standard/Galactic

Scheduled Nights:
Run 1 (2017A):  KP-0.9m/HDI -- 10n on May 09 - May 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 >   2017A-0320

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