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Measurement of the Distance and Proper Motions of the H2O Masers in the Young Planetary Nebula K 3-35 | | Daniel Tafoya
; Hiroshi Imai
; Yolanda Gomez
; Jose M. Torrelles
; Nimesh A. Patel
; Guillem Anglada
; Luis F. Miranda
; Mareki Honma
; Tomoya Hirota
; Takeshi Miyaji
; | | Date: |
6 Jan 2011 | | Abstract: | In this paper we present the results of very long baseline interferometry
(VLBI) ob- servations carried out with the VLBI Exploration of Radio Astrometry
(VERA) array and the Very Long Baseline Array (VLBA) toward H2O masers in a
young planetary nebula K 3-35. From the VERA observations we measured the
annual parallax and proper mo- tion of a bright water maser spot in K 3-35. The
resulting distance is D = 3.9+0.7 kpc. -0.5 This is the first time that the
parallax of a planetary nebula is obtained by observations of its maser
emission. On the other hand, the proper motion of K 3-35 as a whole was esti-
mated to be {mu}{alpha} = -3.34+/-0.10 mas yr-1, {mu}{delta} = -5.93+/-0.07
mas yr-1. From these results we determined the position and velocity of K 3-35
in Galactic cylindrical coordinates: (R,{ heta},z) = (7.11+0.08-0.06 kpc,
27+/-5{circ}, 140+25-18 pc) and (VR, V{ heta}, Vz) = (33+/-16, 233+/-11,
11+/-2) km s-1, respectively. Additionally, from our VLBA observations we
measured the relative proper motions among the water maser spots located in the
central region of the nebula, which have been proposed to be tracing a toroidal
structure. The distribution and relative proper motions of the masers, compared
with previous reported observed epochs, suggest that such structure could be
totally destroyed within a few years, due to the action of high velocity winds
and the expansion of the ionization front in the nebula. | | Source: | arXiv, 1101.1160 | | Services: | Forum | Review | PDF | Favorites | |
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