SIMBAD references

2006MNRAS.372.1081F - Mon. Not. R. Astron. Soc., 372, 1081-1092 (2006/November-1)

Two new evolved bipolar planetary nebulae in the solar neighbourhood.


Abstract (from CDS):

We present AAO/UKST Hα+[N ii] narrow-band imagery and low- and medium-resolution optical spectroscopy of RCW24 and RCW69. These nebulae were previously classified as HII regions, but we now show them to be two of the largest and nearest bipolar Type I PNe yet discovered. Distances were estimated using extinction-distance and kinematic methods, and via a new Hα surface brightness-radius relation. The adopted distances are 1.0 ±0.3kpc for RCW24 and 1.3±0.2kpc for RCW69. Both objects have enhanced nitrogen abundances, with logN/O≃+0.44 for RCW24, and logN/O=+0.33 for RCW 69. Systemic velocities and|z| distances are VLSR= +5 km/s and|z| ∼ 23pc for RCW 24, and VLSR= -33 km/s and only|z| ∼ 7pc for RCW 69. Both PNe originated from massive progenitors (>2.0-2.5M), as deduced from their chemical abundances, large ionized masses, small|z| distances, low peculiar velocities and relatively hot central stars. These two objects form an important addition to the small sample of evolved bipolar PNe in the solar neighbourhood.

Abstract Copyright: 2006 The Authors. Journal compilation © 2006 RAS

Journal keyword(s): stars: AGB and post-AGB - planetary nebulae: general - planetary nebulae: individual: RCW24 - planetary nebulae: individual: RCW69

Simbad objects: 30

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