NOAO >   Observing Info >   Approved Programs >   2014A-0501

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Proposal Information for 2014A-0501


PI: Adam L. Kraus, University of Texas at Austin, alk@astro.as.utexas.edu
Address: Dept of Astronomy, 2515 Speedway, Austin, TX 78712, USA

CoI: Michael J. Ireland, Macquarie University
CoI: Aaron Rizzuto, Macquarie University

Title: Membership and Binarity of High-Mass Stars in Scorpius-Centaurus

Abstract: The Scorpius-Centaurus OB association is the nearest large star- forming region, comprising over half of all the young (<30 Myr) stars closer than Orion (d<400 pc). Sco-Cen is a testbed population for understanding the initial mass function, the structure and kinematics of star-forming regions, stellar multiplicity, and planet formation - all in an unbound population unlike more traditional open clusters. However, the membership of Sco-Cen is still uncertain; even the high- mass population of BAF stars is only known probabilistically, based on proper motions and low-quality parallaxes from HIPPARCOS. We propose a multi-epoch RV survey of previously-suggested BAF stars in Sco-Cen to confirm their membership (based on the known RV of the association), identify short-period binary companions (based on RV variations on month timescales) and unveil the longer-period low-mass stellar population (based on spectral deconvolution to identify features associated with late-type stars). This survey will use CHIRON on the CTIO 1.5m telescope for 9 nights to obtain 2 spectra (spanning 3 months) for each of 176 candidate members without existing RV data.


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NOAO >   Observing Info >   Approved Programs >   2014A-0501

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