NOAO >   Observing Info >   Approved Programs >   2017A-0176

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Program Information for 2017A-0176


PI: Jeffrey S Bary, Colgate U., jbary@colgate.edu
Address: 13 OAK DRIVE, HAMILTON, NY 13346 United States

CoI: Michael Petersen, U. Mass
CoI: Benjamin Tofflemire, U. of Wisconsin, Madison

Title: High-Resolution Spectroscopy of Orbitally-Modulated Accretion Activity in Pre-Main Sequence Binaries

Abstract: We propose to study the interactions of circumstellar and circumbinary material in hte young, tight binary systems AK Sco and TWA 3a, using Phoenix on Gemini South. The highly elliptical orbits of the each binary produce orbitally-modulated accretion activity with "periodic" flares occurring at periastron passages. The predictable nature of the accretion activity and flares provides a unique laboratory for studying accretion-related phenomena such as accretion flows, stellar winds, and outflows/jets. At high spectral resolution, we will probe two well-known indicators of infalling and outflowing gas, PaB and HeI, and observe the evolution of the feature morphologies including shapes, kinematics, and strengths as the system undergoes an accretion outburst. Both binaries have similar eccentricities and mass ratios but differing orbital periods (AK Sco – 13.6 d; TWA 3a – 34.9 d). Observations of both will allow us to test the impact of orbital separation on binary accretion flows.

Program Type: Standard/Galactic

Scheduled Nights:
Run 1 (2017A):  GEM-S-SVC/PHNX -- 18hrs band 3 (GS-2017A-Q-85)


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-0176

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