The bowshock and jet in the 40 arcmin diameter halo of the Helix nebula, NGC 7293
Abstract
Two distinctive features were discovered in an optical image of the 40 arcmin diameter outer halo of NGC 7293; one resembled morphologically a bow-shock and the other a jet. These were confirmed later in GALEX NUV images. Profiles of the Halpha and [NII] 6584A lines have exactly the kinematical signatures expected of both classifications. The truncated jet is shown to be collisionally ionized material in a 300 km/s collimated monopolar outflow which most likely originated in the late AGB evolutionally phase of the progenitor star. The bowshock is shown kinematically to be caused by the motion of the whole of NGC 7293 with respect to its ambient medium.
- Publication:
-
Asymmetrical Planetary Nebulae VI Conference
- Pub Date:
- April 2014
- Bibcode:
- 2014apn6.confE.113M
- Keywords:
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- stars: planetary nebulae;
- planetary nebulae: general