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A study of the kinematics and binary-induced shaping of the planetary nebula HaTr 4

Authors

  • A. A. Tyndall,

    Corresponding author
    1. Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, University of Manchester, Oxford Road, Manchester M13 9PL
    2. Isaac Newton Group of Telescopes, Apartado de Correos 368, E-38700 Santa Cruz de La Palma, Spain
    3. European Southern Observatory, Alonso de Córdova 3107, Casilla 19001, Santiago, Chile
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  • D. Jones,

    1. European Southern Observatory, Alonso de Córdova 3107, Casilla 19001, Santiago, Chile
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  • M. Lloyd,

    1. Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, University of Manchester, Oxford Road, Manchester M13 9PL
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  • T. J. O’Brien,

    1. Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, University of Manchester, Oxford Road, Manchester M13 9PL
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  • D. Pollacco

    1. Astrophysics Research Centre, Queen’s University Belfast, Belfast BT7 1NN
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  • Based on observations made with European Southern Observatory Telescopes at the La Silla Paranal Observatory, under programme IDs 081.D-0857 and 055.D-0550.

E-mail: amy.tyndall@postgrad.manchester.ac.uk

ABSTRACT

We present the first detailed spatio-kinematical analysis and modelling of the planetary nebula HaTr 4, one of few known to contain a post-common-envelope central star system. Common-envelope evolution is believed to play an important role in the shaping of planetary nebulae, but the exact nature of this role is yet to be understood. High spatial- and spectral-resolution spectroscopy of the [O iii] λ5007 Å nebular line obtained with VLT-UVES is presented alongside deep narrow-band Hα+[N ii] λ6584 Å imagery obtained using EMMI-NTT, and together the two are used to derive the three-dimensional morphology of HaTr 4. The nebula is found to display an extended ovoid morphology with an enhanced equatorial region consistent with a toroidal waist – a feature believed to be typical amongst planetary nebulae with post-common-envelope central stars. The nebular symmetry axis is found to lie perpendicular to the orbital plane of the central binary, concordant with the idea that the formation and evolution of HaTr 4 has been strongly influenced by its central binary.

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