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Single-Crystal Nanorings Formed by Epitaxial Self-Coiling of Polar Nanobelts

Single-Crystal Nanorings Formed by Epitaxial Self-Coiling of Polar Nanobelts,10.1126/science.1092356,Science,Xiang Yang Kong,Yong Ding,Rusen Yang,Zhon

Single-Crystal Nanorings Formed by Epitaxial Self-Coiling of Polar Nanobelts   (Citations: 149)
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On the basis of these observations, LkH 233 is the more evolved of the two systems, with well-defined cavities swept out by bipo- lar outflow and bisected by a very dark lane. LkH 198 is a less evolved system, which is only in the early stages of developing bipolar cavities and possesses lower extinction in the apparent disk midplane. The observed circumstellar environments are consistent with the rotationally flattened infall envelopes models developed for T Tauri stars, indicating that the process of envelope collapse has similar phases, despite the large disparities in mass and luminosity between these two classes of young stars. This morphological similarity leads us to infer that the conservation and trans- port of angular momentum is the dominant phys- ical process for both classes of stars. Alternate formation pathways have been suggested for OB stars that invoke new physical mechanisms, such as magnetohydrodynamic turbulence (31 )o r stellar mergers (32). The Herbig Ae stars studied here appear to be below the mass threshhold at which such effects become important.
Journal: Science , vol. 303, no. 5662, pp. 1348-1351, 2004
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