NOAO >   Observing Info >   Approved Programs >   2018A-0271

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Program Information for 2018A-0271


PI: Benjamin Kidder, U. of Texas, Austin, btkidder@astro.as.utexas.edu
Address: Robert Lee Moore Hall, 2515 Speedway, Austin, TX, 78712 United States

CoI: Gregory Mace, U. of Texas, Austin
CoI: Kimberly Sokal, U. of Texas, Austin
CoI: Ricardo Lopez Valdivia, U. of Texas, Austin
CoI: Daniel Jaffe, U. of Texas, Austin

Title: Physical Properties of Confirmed TWA Members

Abstract: Pre-main sequence evolutionary models are an important tool for characterizing YSOs, but the accuracy of comparisons to photometric isochrones decreases at early ages (~0-5Myr) when objects are still embedded. Reddening-independent measurements of stellar parameters (i.e. temperature, surface gravity) using Near-IR spectroscopy may potentially avoid this problem. However, before we apply our spectral synthesis techniques to embedded protostars, we must show the agreement between these techniques and photometric models applied to diskless YSOs where veiling is not a concern. The TW Hya Association (TWA) is ~7-10Myr, and nearly all of its members have dissipated their circumstellar disks, making it an important anchor point for investigating agreement between measurements from Near-IR spectral synthesis and models. We propose to observe 36 members of TWA with IGRINS at Gemini South. Observing members of TWA with IGRINS will build a foundation for applying our spectral synthesis methods to younger embedded protostars. Observations of TWA members will also allow us to identify correlations between physical properties of YSOs and disk dissipation timescales. Finally, we will use IGRINS spectra of the Class III members of TWA as templates for measuring veiling in the <5Myr members of Taurus and Ophiuchus.

Program Type: Standard/Galactic

Scheduled Nights:
Run 1 (2018A):  GEM-SQ/IGRINS -- 25.2hrs band 3 (GS-2018A-Q-312 )


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 >   2018A-0271

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