English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

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 ayoung planetary nebula K 3-35. From the VERA observations we measured theannual parallax and proper mo- tion of a bright water maser spot in K 3-35. Theresulting distance is D = 3.9+0.7 kpc. -0.5 This is the first time that theparallax of a planetary nebula is obtained by observations of its maseremission. 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+/-0.07mas yr-1. From these results we determined the position and velocity of K 3-35in Galactic cylindrical coordinates: (R,{\theta},z) = (7.11+0.08-0.06 kpc,27+/-5{\circ}, 140+25-18 pc) and (VR, V{\theta}, Vz) = (33+/-16, 233+/-11,11+/-2) km s-1, respectively. Additionally, from our VLBA observations wemeasured the relative proper motions among the water maser spots located in thecentral region of the nebula, which have been proposed to be tracing a toroidalstructure. The distribution and relative proper motions of the masers, comparedwith previous reported observed epochs, suggest that such structure could betotally destroyed within a few years, due to the action of high velocity windsand the expansion of the ionization front in the nebula.

Measurement of the Distance and Proper Motions of the H2O Masers in the Young Planetary Nebula K 3-35