AustralieFrV1, PascalFrancis, Curation, bibRecord, 002000

Two new evolved bipolar planetary nebulae in the solar neighbourhood

Identifieur interne : 002000 ( PascalFrancis/Curation ); précédent : 001F99; suivant : 002001

Two new evolved bipolar planetary nebulae in the solar neighbourhood

Auteurs : David J. Frew [Australie] ; Quentin A. Parker [Australie] ; Delphine Russeil [France]

Source :

Monthly Notices of the Royal Astronomical Society [ 0035-8711 ] ; 2006.

RBID : Pascal:06-0492754

Descripteurs français

Pascal (Inist)
- Nébuleuse bipolaire, Nébuleuse planétaire, Voisinage solaire, Spectrométrie optique, Région HII, Cinématique, Brillance surface, Abondance, Etoile chaude, Etoile centrale, Branche géante asymptotique.

English descriptors

KwdEn :
- Abundance, Asymptotic giant branch, Bipolar nebula, Central stars, HII regions, Hot star, Kinematics, Optical spectrometry, Planetary nebulae, Solar neighborhood, Surface brightness.

Abstract

We present AAO/UKST Hα+[N II] narrow-band imagery and low- and medium-resolution optical spectroscopy of RCW 24 and RCW 69. These nebulae were previously classified as H II 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 Ha surface brightness-radius relation. The adopted distances are 1.0 ± 0.3 kpc for RCW 24 and 1.3 ± 0.2 kpc for RCW 69. Both objects have enhanced nitrogen abundances, with log N/O ≃ +0.44 for RCW 24, and log N/O = +0.33 for RCW 69. Systemic velocities and |z| distances are V_LSR = +5 km s^-1 and |z| ∼ 23 pc for RCW 24, and V_LSR = -33 km s^-1 and only |z| ∼ 7 pc for RCW 69. Both PNe originated from massive progenitors (>2.0-2.5 M_◦.), 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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A11	`01`	`1`		`@1 FREW (David J.)`
A11	`02`	`1`		`@1 PARKER (Quentin A.)`
A11	`03`	`1`		`@1 RUSSEIL (Delphine)`
A14	`01`			`@1 Department of Physics, Macquarie University @2 NSW 2109 @3 AUS @Z 1 aut. @Z 2 aut.`
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C01	`01`		`ENG`	@0 We present AAO/UKST Hα+[N II] narrow-band imagery and low- and medium-resolution optical spectroscopy of RCW 24 and RCW 69. These nebulae were previously classified as H II 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 Ha surface brightness-radius relation. The adopted distances are 1.0 ± 0.3 kpc for RCW 24 and 1.3 ± 0.2 kpc for RCW 69. Both objects have enhanced nitrogen abundances, with log N/O ≃ +0.44 for RCW 24, and log N/O = +0.33 for RCW 69. Systemic velocities and \|z\| distances are V_LSR = +5 km s^-1 and \|z\| ∼ 23 pc for RCW 24, and V_LSR = -33 km s^-1 and only \|z\| ∼ 7 pc for RCW 69. Both PNe originated from massive progenitors (>2.0-2.5 M_◦.), 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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C03	`01`	`X`	`ENG`	`@0 Bipolar nebula @5 26`
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C03	`02`	`3`	`FRE`	`@0 Nébuleuse planétaire @5 27`
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C03	`04`	`X`	`ENG`	`@0 Optical spectrometry @5 29`
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C03	`05`	`3`	`FRE`	`@0 Région HII @5 30`
C03	`05`	`3`	`ENG`	`@0 HII regions @5 30`
C03	`06`	`3`	`FRE`	`@0 Cinématique @5 31`
C03	`06`	`3`	`ENG`	`@0 Kinematics @5 31`
C03	`07`	`X`	`FRE`	`@0 Brillance surface @5 32`
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C03	`07`	`X`	`SPA`	`@0 Brillantez superficie @5 32`
C03	`08`	`3`	`FRE`	`@0 Abondance @5 33`
C03	`08`	`3`	`ENG`	`@0 Abundance @5 33`
C03	`09`	`X`	`FRE`	`@0 Etoile chaude @5 34`
C03	`09`	`X`	`ENG`	`@0 Hot star @5 34`
C03	`09`	`X`	`SPA`	`@0 Estrella caliente @5 34`
C03	`10`	`3`	`FRE`	`@0 Etoile centrale @5 35`
C03	`10`	`3`	`ENG`	`@0 Central stars @5 35`
C03	`11`	`X`	`FRE`	`@0 Branche géante asymptotique @5 36`
C03	`11`	`X`	`ENG`	`@0 Asymptotic giant branch @5 36`
C03	`11`	`X`	`SPA`	`@0 Rama gigante asintótica @5 36`
N21				`@1 317`
N44	`01`			`@1 OTO`
N82				`@1 OTO`

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Le document en format XML

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<front><div type="abstract" xml:lang="en">We present AAO/UKST Hα+[N II] narrow-band imagery and low- and medium-resolution optical spectroscopy of RCW 24 and RCW 69. These nebulae were previously classified as H II 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 Ha surface brightness-radius relation. The adopted distances are 1.0 ± 0.3 kpc for RCW 24 and 1.3 ± 0.2 kpc for RCW 69. Both objects have enhanced nitrogen abundances, with log N/O ≃ +0.44 for RCW 24, and log N/O = +0.33 for RCW 69. Systemic velocities and |z| distances are V<sub>LSR</sub>
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<fC01 i1="01" l="ENG"><s0>We present AAO/UKST Hα+[N II] narrow-band imagery and low- and medium-resolution optical spectroscopy of RCW 24 and RCW 69. These nebulae were previously classified as H II 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 Ha surface brightness-radius relation. The adopted distances are 1.0 ± 0.3 kpc for RCW 24 and 1.3 ± 0.2 kpc for RCW 69. Both objects have enhanced nitrogen abundances, with log N/O ≃ +0.44 for RCW 24, and log N/O = +0.33 for RCW 69. Systemic velocities and |z| distances are V<sub>LSR</sub>
 = +5 km s<sup>-1</sup>
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Two new evolved bipolar planetary nebulae in the solar neighbourhood

Two new evolved bipolar planetary nebulae in the solar neighbourhood

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Links to Exploration step

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

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