Astronomy and Astrophysics – Astrophysics – Galaxy Astrophysics
Scientific paper
2011-12-21
Astronomy and Astrophysics
Astrophysics
Galaxy Astrophysics
6 pages, 4 figures; accepted for publication in MNRAS
Scientific paper
Hu\,1-2 is a planetary nebula that contains an isolated knot located northwestern of the main nebula, which could be related to a collimated outflow. We present a subsarcsecond H$\alpha$+[N\,{\sc ii}] image and a high-resolution, long-slit spectrum of Hu\,1-2 that allow us to identify the southeastern counterpart of the northwestern knot and to establish their high velocity ($>$ 340 km\,s$^{-1}$), collimated bipolar outflow nature. The detection of the northwestern knot in POSS red plates allows us to carry out a proper motion analysis by combining three POSS red plates and two narrow-band H$\alpha$+[N\,{\sc ii}] CCD images, with a time baseline of $\simeq$ 57 yr. A proper motion of 20 $\pm$ 6\,mas\,yr$^{-1}$ along position angle 312$^{\circ}$ $\pm$ 15$^{\circ}$, and a dynamical age of 1375$^{+590}$\llap{$_{-320}$}\,yr are obtained for the bipolar outflow. The measured proper motion and the spatio-kinematical properties of the bipolar outflow yield a lower limit of 2.7\,kpc for the distance to Hu\,1-2.
Blanco Mauro
Guerrero Martin A.
Miranda Luis F.
Riera Arnau
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