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2009MNRAS.398..385V - Mon. Not. R. Astron. Soc., 398, 385-393 (2009/September-1)
High-speed knots in the hourglass-shaped planetary nebula Hubble 12.
VAYTET N.M.H., RUSHTON A.P., LLOYD M., LOPEZ J.A., MEABURN J., O'BRIEN T.J., MITCHELL D.L. and POLLACCO D.
Abstract (from CDS):
We have derived the inclination angle of the hourglass-shaped nebular shell to be ∼65° to the line of sight. It has been suggested that Hb 12's central star system is an eclipsing binary which would imply a binary inclination of at least 80°. However, if the central binary has been the major shaping influence on the nebula, then both nebula and binary would be expected to share a common inclination angle.
Finally, we report the discovery of high-velocity knots with Hubble-type velocities, close to the core of Hb 12, observed in Hα and oriented in the same direction as the end caps. Very different velocities and kinematical ages were calculated for the outer and inner knots showing that they may originate from different outburst events.
Abstract Copyright: © 2009 The Authors. Journal compilation © 2009 RAS
Journal keyword(s): circumstellar matter - stars: kinematics - stars: mass-loss - ISM: jets and outflows - planetary nebulae: individual: Hb 12
Simbad objects: 13
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