NOAO >   Observing Info >   Approved Programs >   2019A-0302

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Program Information for 2019A-0302


PI: Zachary Hartman, Georgia State U., hartman@astro.gsu.edu
Address: Physics Department, 25 Park Place, Room 605, Atlanta, GA 30302 United States

CoI: Sebastien Lepine, Georgia State U.
CoI: Gerard Van Belle, Lowell Observatory

Title: Looking for Higher Order Multiples in M+M and Halo Wide Binaries

Abstract: We propose to use 2 nights in 2019A and 2 nights in 2020A on the WIYN 3.5m telescope using the Hydra+Bench spectrograph to obtain high resolution spectra for 60-80 highly probable low-mass (M+M) and Halo wide binaries (projected separations $> 1,000$ AU) to identify higher order multiple systems. It has been only in the past decade that the multiplicity statistics for M dwarfs have started to be examined in depth. Our goal is to expand upon those initial surveys for M+M wide binary multiplicity (Law et al. 2010), and also examine for the first time the wide binary multiplicity fraction for stars in old populations from the local Galactic halo. Our new sample of wide binaries, which includes many low-mass and old systems, was assembled through a Bayesian analysis of common proper motion pairs in the SUPERBLINK-GAIA high proper motion catalog and further refined using Gaia DR2 parallaxes. Our goal is to focus on a well-defined sample of 85 nearby wide binaries to identify inner, short-period subsystems that would appear as single- lined or double-lined spectroscopic binaries. Combining these results with an ongoing speckle campaign, we will determine the higher order multiplicity of these wide pairs which is critical to understanding how they form.

Program Type: Standard/Galactic

Scheduled Nights:
Run 1 (2019A):  WIYN/HYDR -- 2n on Mar 24 2019, Apr 21 2019
Run 2 (2019A):  WIYN/HYDR -- 1n on May 24 2019


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NOAO >   Observing Info >   Approved Programs >   2019A-0302

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