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The structure accompanying young star formation

Published online by Cambridge University Press:  01 May 2007

Vasily A. Demichev
Affiliation:
Space Research Institute, Moscow, Russia email: demichev@iki.rssi.ru
L. I. Matveyenko
Affiliation:
Space Research Institute, Moscow, Russia email: demichev@iki.rssi.ru
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Abstract

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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.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2007

References

Abraham, Z., Vilas Boas, J.W.S., & Ciampo, L.F. del 1986, A&A 167, 311Google Scholar
Burke, B. F., Johnston, K. J., Efanov, V. A., Clark, B. G., Kogan, L. R., Kostenko, V. I., Lo, K. Y., Matveenko, L. I., Moiseev, I. G., Moran, J. M., Knowles, S. H., Papa, D. C., Papadopoulos, G. D., Rogers, A. E. E., & Schwartz, P. R. 1972, AZh 49, 465Google Scholar
Demichev, V. A. & Matveyenko, L. I. 2004, Astron. Rep. 48, 979CrossRefGoogle Scholar
Garay, G., Moran, J. M., & Hashick, A. D. et al. 1989, ApJ 338, 244CrossRefGoogle Scholar
Genzel, R., Downs, D., Moran, J. M. et al. 1978, A&A 66, 13Google Scholar
Matveyenko, L. I., Kogan, L. R., & Kostenko, V. I. 1980, Astron. Lett. 6, 279Google Scholar
Matveyenko, L. I. 1981, Astron. Lett. 7, 54Google Scholar
Matveyenko, L. I., Graham, D. A., & Diamond, P. J. 1988, Astron. Lett. 14, 468Google Scholar
Matveyenko, L. I., Diamond, P. J. & Graham, D. A. 1998, Astron. Lett. 24, 623Google Scholar
Matveyenko, L. I., Zakharin, K.M., Diamond, P. J. & Graham, D. A. 2004 Astron. Lett. 30, 100CrossRefGoogle Scholar
Matveyenko, L. I., Demichev, V. A., Sivakon, S.S., Diamond, Ph. D., & Graham, D. A. 2005 Astron. Lett. 31, 913CrossRefGoogle Scholar