Sub-arcsecond 10 micron imaging of newly-formed stars |
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Authors: | R M Danen C R Gwinn E E Bloemhof |
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Institution: | (1) Dept. of Physics, University of California, Santa Barbara, 93106 Santa Barbara, CA, USA;(2) Harvard-Smithsonian Center for Astrophysics, Cambridge, USA |
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Abstract: | We describe initial results of a program to image massive newly-formed stars with sub-arc second spatial resolution. We discuss high-precision diffraction-limited size measurements at =10 m made using the 3 m Lick telescope. The point-spread function has FWHM 0.7; deconvolution yields a spatial resolution of 0.35. We find that the core component of one such object, LkH 101, is unresolved at these scales, and we are able to set a 95%-confidence upper limit of 270 AU for the diameter of the circumstellar dust shell. This places the dust at the same radial scale as a strong ionized stellar wind region seen at radio wavelengths. Our observations, when combined with published spectral observations, rule out an optically thick circumstellar disk but allow a radially thin, anisotropic distribution of dust, or alternatively an isotropic distribution of dust with a narrow range of large grain sizes. |
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