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Title:
First L-Band Interferometric Observations of a Young Stellar Object: Probing the Circumstellar Environment of MWC 419
Authors:
Ragland, S.; Akeson, R. L.; Armandroff, T.; Colavita, M. M.; Danchi, W. C.; Hillenbrand, L. A.; Millan-Gabet, R.; Ridgway, S. T.; Traub, W. A.; Vasisht, G.; Wizinowich, P. L.
Affiliation:
AA(W. M. Keck Observatory, 65-1120 Mamalahoa Hwy, Kamuela, HI 96743, USA ), AB(NExScI, California Institute of Technology, 770 South Wilson Avenue, Pasadena, CA 91125, USA ), AC(W. M. Keck Observatory, 65-1120 Mamalahoa Hwy, Kamuela, HI 96743, USA ), AD(Jet Propulsion Laboratory, California Institute of Technology, M/S 301-451, 4800 Oak Grove Dr., Pasadena CA, 91109, USA ), AE(NASA Goddard Space Flight Center, Exoplanets and Stellar Astrophysics, Code 667, Greenbelt, MD 20771, USA ), AF(California Institute of Technology, Pasadena, CA 91125, USA ), AG(NExScI, California Institute of Technology, 770 South Wilson Avenue, Pasadena, CA 91125, USA ), AH(National Optical Astronomy Observatories, P.O. Box 26732, Tucson, AZ 85726-6732, USA), AI(Jet Propulsion Laboratory, California Institute of Technology, M/S 301-451, 4800 Oak Grove Dr., Pasadena CA, 91109, USA ), AJ(Jet Propulsion Laboratory, California Institute of Technology, M/S 301-451, 4800 Oak Grove Dr., Pasadena CA, 91109, USA ), AK(W. M. Keck Observatory, 65-1120 Mamalahoa Hwy, Kamuela, HI 96743, USA )
Publication:
The Astrophysical Journal, Volume 703, Issue 1, pp. 22-29 (2009). (ApJ Homepage)
Publication Date:
09/2009
Origin:
IOP
ApJ Keywords:
circumstellar matter, instrumentation: interferometers, stars: emission-line, Be, stars: individual: MWC 419, stars: pre-main sequence, techniques: interferometric
DOI:
10.1088/0004-637X/703/1/22
Bibliographic Code:
2009ApJ...703...22R

Abstract

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 were obtained simultaneously with a new configuration of the 85 m baseline Keck Interferometer. Our observations are sensitive to the radial distribution of temperature in the inner region of the disk of MWC 419. We fit the visibility data with both simple geometric and more physical disk models. The geometric models (uniform disk and Gaussian) show that the apparent size increases linearly with wavelength in the 2-4 μm wavelength region, suggesting that the disk is extended with a temperature gradient. A model having a power-law temperature gradient with radius simultaneously fits our interferometric measurements and the spectral energy distribution data from the literature. The slope of the power law is close to that expected from an optically thick disk. Our spectrally dispersed interferometric measurements include the Br γ emission line. The measured disk size at and around Br γ suggests that emitting hydrogen gas is located inside (or within the inner regions) of the dust disk.
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