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We present an analysis of infrared (IR) echelle spectra of five stars in theTW Hydrae Association (TWA). We model the Zeeman broadening in fourmagnetic-sensitive \ion{Ti}{1} lines near $2.2 \mu$m and measure the value ofthe photospheric magnetic field averaged over the surface of each star. Toensure that other broadening mechanisms are properly taken into account, wealso inspect several magnetically insensitive CO lines near $2.3 \mu$m and findno excess broadening above that produced by stellar rotation and instrumentalbroadening, providing confidence in the magnetic interpretation of the width ofthe \ion{Ti}{1} lines. We then utilize our results to test the relationshipbetween stellar magnetic flux and X-ray properties and compare the measuredfields with equipartition field values. Finally, we use our results and recentresults on a large sample of stars in Taurus to discuss the potential evolutionof magnetic field properties between the age of Taurus ($\sim$2 Myrs) and theage of TWA ($\sim$10 Myrs). We find that the average stellar field strengthincreases with age; however, the total unsigned magnetic flux decreases as thestars contract onto the main-sequence.

Magnetic Properties of Young Stars in the TW Hydrae Association