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High Velocity Bipolar Outflows in Planetary Nebulae: NGC 6537 and Hb 5

  • R. L. M. Corradi
  • H. E. Schwarz
Conference paper
Part of the Astrophysics and Space Science Library book series (ASSL, volume 186)

Abstract

Bipolar symmetry characterizes the morphology of a large number of objects thought to be protoplahetary nebulae. Among these, NGC 6537 and Hb 5 were observed on July 1991 at the 3.5m NTT telescope of the European Southern Observatory, using the EMMI multimode instrument. Hα+[NII] images (Fig. 1) allowed accurate information on the faintest structure of the external region of these nebulae: the line emission extends out to 120″ from the center of NGC 6537 and out to 30″ in Hb 5 (compared to the nebular radii of 40″ and 10″, respectively, quoted in the literature). An interesting feature of the morphology of both nebulae is the point-symmetrical distribution of line emission characterizing their brightest regions.

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Copyright information

© Springer Science+Business Media Dordrecht 1993

Authors and Affiliations

  • R. L. M. Corradi
    • 1
    • 2
  • H. E. Schwarz
    • 1
  1. 1.La SillaEuropean Southern ObservatoryChile
  2. 2.Dipartimento di AstronomiaUniversità di PadovaItaly

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