Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-08-05
Astronomy and Astrophysics
Astrophysics
9 pages including 7 figures, to appear in PASJ, Vol. 54, No. 5
Scientific paper
Water masers around an AGB star, IRC+60169, were observed at four epochs using the Japanese VLBI networks. The distribution of the maser features is limited in a thick-shell region, which has inner and outer expansion velocities of 7 km/s and 14 km/s at radii of 25 mas and 120 mas, respectively. The distribution of the red-shifted features exhibits a ring-like structure, the diameter of which is 30 mas, and corresponds to the inner radius of the maser shell. This implies that dense gas around the star obscures red-shifted emission. Although a position--radial velocity diagram for the maser features is consistent with a spherical shell model, the relative proper motions do not indicate an expansion motion of the shell. A remarkable property has been found that is a possible periodic change of the alignment pattern of water maser spots.
Hasegawa W.
Imai Hiroshi
Nakajima Jun'ichi
Nishio Masanori
Omodaka Toshihiro
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