Journal Article

The collimated outflows of the planetary nebula Hu 1-2: proper motion and radial velocity measurements*

L. F. Miranda, M. Blanco, M. A. Guerrero and A. Riera

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 421, issue 2, pages 1661-1665
Published in print April 2012 | ISSN: 0035-8711
Published online March 2012 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2012.20423.x
The collimated outflows of the planetary nebula Hu 1-2: proper motion and radial velocity measurements*

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Hu 1-2 is a planetary nebula that contains an isolated knot located north-west of the main nebula, which could be related to a collimated outflow. We present a subarcsecond Hα+[N ii] image and a high-resolution, long-slit spectrum of Hu 1-2 that allow us to identify the south-eastern counterpart of the north-western knot and to establish their high-velocity (>340 km s−1), collimated bipolar outflow nature. The detection of the north-western knot in Palomar Observatory Sky Atlas (POSS) red plates allows us to carry out a proper motion analysis by combining three POSS red plates and two narrow-band Hα+[N ii] CCD images, with a time baseline of ≃57 yr. A proper motion of 20 ± 6 mas yr−1 along position angle 312°± 15° and a dynamical age of 1375 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.

Keywords: ISM: jets and outflows; ISM: kinematics and dynamics; planetary nebulae: individual: Hu 1-2

Journal Article.  3585 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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