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We present spatially-resolved K- and L-band spectra (at spectral resolution R= 230 and R = 60, respectively) of MWC 419, a Herbig Ae/Be star. The data wereobtained simultaneously with a new configuration of the 85-m baseline KeckInterferometer. Our observations are sensitive to the radial distribution oftemperature in the inner region of the disk of MWC 419. We fit the visibilitydata with both simple geometric and more physical disk models. The geometricmodels (uniform disk and Gaussian) show that the apparent size increaseslinearly with wavelength in the 2-4 microns wavelength region, suggesting thatthe disk is extended with a temperature gradient. A model having a power-lawtemperature gradient with radius simultaneously fits our interferometricmeasurements and the spectral energy distribution data from the literature. Theslope of the power-law is close to that expected from an optically thick disk.Our spectrally dispersed interferometric measurements include the Br gammaemission line. The measured disk size at and around Br gamma suggests thatemitting hydrogen gas is located inside (or within the inner regions) of thedust disk.

First L-band Interferometric Observations of a Young Stellar Object: Probing the Circumstellar Environment of MWC 419