Methanol and H2o Masers in a Disk Around GL2789

Details Methanol and H2o Masers in a Disk Around GL2789 Methanol and H2o Masers in a Disk Around GL2789

2003-04-10

arxiv.org/abs/astro-ph/0304181v1

Astron.Rep. 46 (2002) 969-980

Astronomy and Astrophysics

Astrophysics

22 pages, 8 figures, published in Astronomy Reports

Scientific paper

10.1134/1.1529255

VLBA and EVN radio observations of H2O masers at 22 GHz and methanol masers at 6.7 GHz have been used to obtain images of the maser spots in the infrared object GL2789, which is associated with the young stellar object V645Cyg. The position of these masers coincides with that of the optical object to within 0.2 arcsec. The maser spots are located in a line oriented north--south, and their positions and radial velocities can be described by a model with a Keplerian disk with maximum radius 40 AU for the H2O masers and 800 AU for the methanol masers. The H2O and methanol masers spots are unresolved, and the lower limits for their brightness temperatures are 2x10^{13} K and 1.4x10^9 K, respectively. A model in which the maser radiation is formed in extended water-methanol clouds associated with ice planets forming around the young star is proposed.

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