NOAO >   Observing Info >   Approved Programs >   2013B-0112

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Proposal Information for 2013B-0112


PI: Kevin Gullikson, University of Texas, kgulliks@astro.as.utexas.edu
Address: Astronomy Department, 2515 Speedway, Stop C1400, Austin, TX 78712, USA

CoI: Sarah Dodson-Robinson, University of Texas

Title: A Search for Disk-Born Binary Star Systems

Abstract: We propose to observe a sample of southern main sequence A- and B- type stars with high signal-to-noise ratio, high-resolution spectroscopy, in order to search for close low-mass companions. These companions may have formed by gravitational instability in the protostellar disk as the primary star was forming. We will cross- correlate the spectra we observe against model spectra for F- to M-type secondary stars; a detected companion will appear as a peak in the cross- correlation function. We will use any detected companions to constrain the mass-ratio distribution of intermediate-mass binaries. The mass ratio distribution in our sample will help to constrain the importance of the gravitational instability mechanism in forming intermediate-mass binary systems. We expect to be sensitive to mass ratios q\equiv M_s/M_p \gtrsim 0.06-0.15, and to orbital separations less then a few tens of AU.


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 >   2013B-0112

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