Star formation region in Orion KL. epoch 1985.8
| Autor: | V. A. Demichev, L. I. Matveenko |
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| Rok vydání: | 2004 |
| Předmět: | |
| Zdroj: | Astronomy Reports. 48:979-987 |
| ISSN: | 1562-6881 1063-7729 |
| DOI: | 10.1134/1.1836021 |
| Popis: | We have derived the fine structure of the region of the H2O supermaserflare in the Orion Nebula at epoch 1985.8. This structure includes a chain of compact components that extends to 25 AU and has a width of 0.4 AU. The velocities of the components vary along the chain. The structure corresponds to an accretion disk separated into protoplanetary rings, viewed edge-on. The velocities of the components correspond to Keplerian motion around an object with a mass of M=0.3±0.2M ⊙. The velocity of the central object relative to the Local Standard of Rest is V LSR=4.0±0.7 km/s. The radius of the inner part of the disk is 9±4 AU, while the radius of the outer disk is 35±6 AU. The rotational velocities of the inner and outer rings are 5±1 km/s and 2.5±0.5 km/s, respectively. The emission of the structure is amplified in the ambient medium—an envelope with velocities of 7.6±0.3 km/s. The rate at which the envelope is accreting onto the central object is 3.6±0.7 km/s. The gradient of the infall velocity is 1.1 km/s. |
| Databáze: | OpenAIRE |
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