Proper Motion and Kinematics of the Ansae in NGC7009

Details Proper Motion and Kinematics of the Ansae in NGC7009 Proper Motion and Kinematics of the Ansae in NGC7009

2003-11-27

arxiv.org/abs/astro-ph/0311612v1

Astronomy and Astrophysics

Astrophysics

9 pp., 4 tables, 2 figures; accepted for publication by the ApJ

Scientific paper

We have measured the proper motion (PM) and kinematics of the ansae in NGC 7009 using high dispersion echelle spectra and archive narrow band HST images. Assuming that the ansae are moving at equal and opposite velocities from the central star we obtain a system radial velocity of -53+-2km/s, the eastern ansa approaching and the western ansa receding at Vr=5.3+-1km/s with respect to this value. The PM of the eastern ansa is 28+-8mas/yr, which with our weighted distance to NGC 7009 of 0.86+-0.34kpc gives Vexp=112+-32km/s. The electron temperature and density in both ansae were determined to be Te=9000+-400K and Ne=2300+-400/cc. The dynamic age of the ansae is 925+-260yrs.and the implied PM of the central star is 1+-0.5mas/yr. This is in qualitative but not quantitative agreement with previous work.

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