Astronomy and Astrophysics – Astronomy
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007iaus..243..215d&link_type=abstract
Star-Disk Interaction in Young Stars, Proceedings of the International Astronomical Union, IAU Symposium, Volume 243, p. 215-222
Astronomy and Astrophysics
Astronomy
Jets, Bipolar Outflows, Accretion Disk, Maser
Scientific paper
We studied the structure of the H2O super maser region in Orion with VLBI angular resolution of 0.1 mas or 0.05 AU. The maser emission (F ˜ 8 MJy) was determined by highly organized structure: accretion disk, bipolar outflow, torus and surrounding shell. The accretion disk, divided into protoplanetary rings, is viewed edge-on. The disk rotates as a rigid body with velocities V ˜ ΩR and the rotation period is ˜ 170 yrs. The highly collimated bipolar outflow has a size of 9×0.7 AU, a velocity of ˜ 10 km/s. In the center a bright compact (≤0.05 AU) source ejector is located, surrounded by a torus 0.6 AU in diameter. The outflow has a helix structure, which is determined by precession with a period of T ˜ 10 yrs. Comet-like bullets were observed on distances up to 80 AU.
Demichev Vasily A.
Matveyenko L. I.
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