Two new evolved bipolar planetary nebulae in the solar neighbourhood

Details Two new evolved bipolar planetary nebulae in the solar neighbourhood Two new evolved bipolar planetary nebulae in the solar neighbourhood

Nov 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006mnras.372.1081f&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 372, Issue 3, pp. 1081-1092.

Astronomy and Astrophysics

Astronomy

21

Stars: Agb And Post-Agb, Planetary Nebulae: General, Planetary Nebulae: Individual: Rcw24, Planetary Nebulae: Individual: Rcw69

Scientific paper

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-1 and |z| ~ 23pc for RCW 24, and VLSR = -33 km s-1 and only |z| ~ 7pc for RCW 69. Both PNe originated from massive progenitors (>2.0-2.5Msolar), 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.

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