Two new evolved bipolar planetary nebulae in the solar neighbourhood

David J. Frew; Quentin A. Parker; Delphine Russeil

doi:10.1111/j.1365-2966.2006.10898.x

Two new evolved bipolar planetary nebulae in the solar neighbourhood

David J. Frew, Quentin A. Parker, Delphine Russeil

Research output: Contribution to journal › Article › peer-review

30 Citations (Scopus)

Abstract

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 ± 0.3 kpc for RCW24 and 1.3 ± 0.2 kpc for RCW69. Both objects have enhanced nitrogen abundances, with log N/O≃+0.44 for RCW24, and log N/O =+0.33 for RCW 69. Systemic velocities and |z| distances are VLSR = +5 kms⁻¹ and |z| ~23 pc for RCW 24, and VLSR = −33 km s⁻¹ and only |z| ~7 pc 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.

Original language	English
Pages (from-to)	1081-1092
Number of pages	12
Journal	Monthly Notices of the Royal Astronomical Society
Volume	372
Issue number	3
DOIs	https://doi.org/10.1111/j.1365-2966.2006.10898.x
Publication status	Published - 2006

Keywords

stars, AGB and post-AGB
planetary nebulae

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10.1111/j.1365-2966.2006.10898.x

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title = "Two new evolved bipolar planetary nebulae in the solar neighbourhood",

abstract = "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 ± 0.3 kpc for RCW24 and 1.3 ± 0.2 kpc for RCW69. Both objects have enhanced nitrogen abundances, with log N/O≃+0.44 for RCW24, and log N/O =+0.33 for RCW 69. Systemic velocities and |z| distances are VLSR = +5 kms⁻¹ and |z| ~23 pc for RCW 24, and VLSR = −33 km s⁻¹ and only |z| ~7 pc 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.",

keywords = "stars, AGB and post-AGB, planetary nebulae",

author = "Frew, {David J.} and Parker, {Quentin A.} and Delphine Russeil",

year = "2006",

doi = "10.1111/j.1365-2966.2006.10898.x",

language = "English",

volume = "372",

pages = "1081--1092",

journal = "Monthly Notices of the Royal Astronomical Society",

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TY - JOUR

T1 - Two new evolved bipolar planetary nebulae in the solar neighbourhood

AU - Frew, David J.

AU - Parker, Quentin A.

AU - Russeil, Delphine

PY - 2006

Y1 - 2006

N2 - 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 ± 0.3 kpc for RCW24 and 1.3 ± 0.2 kpc for RCW69. Both objects have enhanced nitrogen abundances, with log N/O≃+0.44 for RCW24, and log N/O =+0.33 for RCW 69. Systemic velocities and |z| distances are VLSR = +5 kms⁻¹ and |z| ~23 pc for RCW 24, and VLSR = −33 km s⁻¹ and only |z| ~7 pc 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.

AB - 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 ± 0.3 kpc for RCW24 and 1.3 ± 0.2 kpc for RCW69. Both objects have enhanced nitrogen abundances, with log N/O≃+0.44 for RCW24, and log N/O =+0.33 for RCW 69. Systemic velocities and |z| distances are VLSR = +5 kms⁻¹ and |z| ~23 pc for RCW 24, and VLSR = −33 km s⁻¹ and only |z| ~7 pc 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.

KW - stars, AGB and post-AGB

KW - planetary nebulae

U2 - 10.1111/j.1365-2966.2006.10898.x

DO - 10.1111/j.1365-2966.2006.10898.x

M3 - Article

SN - 0035-8711

VL - 372

SP - 1081

EP - 1092

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 3

ER -

Two new evolved bipolar planetary nebulae in the solar neighbourhood

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Keywords

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