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

Authors

  • L. F. Miranda,

    Corresponding author
    1. Consejo Superior de Investigaciones Científicas, C/Serrano 117, E-28006 Madrid, Spain
    2. Departamento de Física Aplicada, Facultade de Ciencias, Campus Lagoas-Marcosende s/n, Universidade de Vigo, E-36310 Vigo, Spain
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  • M. Blanco,

    Corresponding author
    1. Instituto de Astrofísica de Andalucía – CSIC, C/Glorieta de la Astronomía s/n, E-18008 Granada, Spain
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  • M. A. Guerrero,

    Corresponding author
    1. Instituto de Astrofísica de Andalucía – CSIC, C/Glorieta de la Astronomía s/n, E-18008 Granada, Spain
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  • A. Riera

    Corresponding author
    1. Departament de Física i Enginyeria Nuclear, EUETIB, Universitat Politècnica de Catalunya, Compte d’Urgell 187, E-08036 Barcelona, Spain
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Based on observations made with the Nordic Optical Telescope (NOT), which is operated jointly by Denmark, Finland, Iceland, Norway and Sweden on the island of La Palma in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias (IAC).

E-mail: lfm@iaa.es (LFM); blanco@iaa.es (MB); mar@iaa.es (MAG); angles.riera@upc.edu (AR)

Present address: Departamento de Física Aplicada, Facultade de Ciencias, Universidade de Vigo, Spain.

ABSTRACT

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 1375inline image 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.

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