3D spatio-kinematic modelling of Abell 48, a planetary nebula around a Wolf-Rayet [WN] star

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY(2022)

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摘要
The planetary nebula (PN) Abell 48 (PN G029.0+00.4) is around a rare Wolf-Rayet [WN5] star whose stellar history is as yet unknown. Using the integral field observations of the H alpha lambda 6563 and [N ii] lambda 6584 line emissions, we conducted a comprehensive spatio-kinematic analysis of this PN. A three-dimensional spatio-kinematic ionization model was developed with the kinematic modelling tool shape to replicate the observed spatially resolved velocity channels and position-velocity diagrams. According to our kinematic analysis of the H alpha emission, this object possesses a deformed elliptic toroidal shell with an outer radius of 23 arcsec and a thickness of 15 arcsec associated with an integrated H alpha emission-line expansion of similar to 35 +/- 5 km s(-1), a maximum poloidal expansion of around 70 +/- 20 km s(-1) at an inclination angle of similar to 30 degrees with respect to the line of sight, and a position angle of similar to 130 degrees measured from east towards north in the equatorial coordinate system. Furthermore, [N ii] kinematic modelling reveals the presence of narrow (similar to 3 arcsec) exterior low-ionization structures surrounding the main elliptical shell, which could have formed as a result of shock collisions with the interstellar medium. The torus-shaped morphology of this PN could be related to its unusual hydrogen-deficient [WN] nucleus that needs to be inspected further.
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关键词
planetary nebulae: individual: PN Abell 48, ISM: kinematics and dynamics, stars: Wolf-Rayet
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