scholarly journals An imaging and spectroscopic study of the planetary nebulae in NGC 5128 (Centaurus A)

2015 ◽  
Vol 574 ◽  
pp. A109 ◽  
Author(s):  
J. R. Walsh ◽  
M. Rejkuba ◽  
N. A. Walton
Keyword(s):  
Spectroscopic Study ◽  
Planetary Nebulae ◽  
Centaurus A

A Spectroscopic Study of Binary Star Planetary Nebulae

1993 ◽  
pp. 390-390 ◽  
Author(s):  
J. R. Walsh ◽  
N. A. Walton ◽  
S. R. Pottasch
Keyword(s):  
Spectroscopic Study ◽  
Binary Star ◽  
Planetary Nebulae

scholarly journals Planetary Nebulae in elliptical galaxies: Dynamical models for Centaurus A

1997 ◽  
Vol 180 ◽  
pp. 472-472
Author(s):  
Anne Mathieu ◽  
Herwig Dejonghe
Keyword(s):  
Elliptical Galaxy ◽  
Planetary Nebulae ◽  
Elliptical Galaxies ◽  
Minor Axis ◽  
Dynamical Models ◽  
Dust Lane ◽  
Centaurus A

We use planetary nebulae major- and minor-axis kinematics (Hui et al. 1995) of the dust-lane elliptical galaxy NGC 5128 (Centaurus A) to build triaxial dynamical models.

The Chemical Abundances of Planetary Nebulae in Centaurus-A (NGC 5128)

1997 ◽  
pp. 478-478
Author(s):  
N. A. Walton ◽  
J. R. Walsh ◽  
G. Jacoby ◽  
R. F. Peletier
Keyword(s):  
Planetary Nebulae ◽  
Chemical Abundances ◽  
Centaurus A

scholarly journals High-resolution spectroscopic study of the planetary nebula Abell 78

1999 ◽  
Vol 193 ◽  
pp. 374-375
Author(s):  
Selene Medina ◽  
Miriam Peña
Keyword(s):  
Chemical Composition ◽  
High Resolution ◽  
Spectroscopic Study ◽  
Spectral Resolution ◽  
Planetary Nebula ◽  
Planetary Nebulae ◽  
Central Star ◽  
Heavy Elements ◽  
Physical Parameters ◽  
Processed Material

High resolution optical spectra of the planetary nebula Abell 78 were gathered, covering the wavelength ranges 3500–6600 Å and 3358–7361 Å, with a spectral resolution of ∼0.1 Å. Two different regions of Abell 78 are analyzed: the strongest knot near the central star which is thought to be a mass-loaded wind from the central star, and the outer, hydrogen-rich envelope. Physical parameters and chemical composition of both regions are estimated. The inner knot appears to be cooler and denser than the hydrogen-rich envelope. The chemical composition of the inner knot shows that there is almost no hydrogen near the central star and the emission is dominated by helium and processed material which has been dredged-up from the inner layers of the star. The outer, hydrogen-rich envelope appears to be deficient in heavy elements, mainly in oxygen, compared to the average abundances that are found among galactic planetary nebulae.

scholarly journals The chemical abundances of Planetary Nebulae in Centaurus-A (NGC 5128)

1997 ◽  
Vol 180 ◽  
pp. 478-478
Author(s):  
N. A. Walton ◽  
J. R. Walsh ◽  
G. Jacoby ◽  
R. F. Peletier
Keyword(s):  
Stellar Population ◽  
Planetary Nebulae ◽  
Early Type ◽  
Chemical Abundances ◽  
Stellar Spectra ◽  
Independent Measure ◽  
Colour Indices ◽  
Centaurus A

Abundances in early-type galaxies are measured from the analysis of stellar spectra (e.g. colour indices, Peletier et al, 1990). The presence of many planetary nebulae (PN) in early-type galaxies provides an independent measure of abundances for the old stellar population and allows the spread in abundances to be sampled at a range of galacto-centric distances. PN are feasible for this project since the nebular O, Ne and S abundances in most PN reflect that of the progenitor star.

scholarly journals The Evolution of NGC 5128: Globular Clusters and Field Stars

2005 ◽  
Vol 13 ◽  
pp. 167-168
Author(s):  
Eric W. Peng
Keyword(s):  
Galaxy Evolution ◽  
Globular Clusters ◽  
Elliptical Galaxy ◽  
Planetary Nebulae ◽  
Host Galaxy ◽  
Disk Galaxies ◽  
Field Star ◽  
Centaurus A

AbstractAs the nearest giant elliptical galaxy, NGC 5128 (Centaurus A) is an excellent place to use globular clusters (GCs) and host galaxy field stars to study galaxy evolution. We have performed a detailed investigation of this galaxy, comparing field star kinematics with the metallicities, ages, and kinematics of GCs. We used our sample of 780 planetary nebulae (PNe) to trace the kinematics of the field star population. Our survey for GCs bring the total number of confirmed GCs to 215. Using spectra of the brightest GCs to determine ages, we find that the metal-rich GCs have a mean age of approximately 4-5 Gyr, and that their kinematics are similar to those of the PNe. The metal-poor GCs have old ages similar to the Galactic GCs, and show a weaker kinematic correlation with the field stars. It is possible that NGC 5128 was formed by the merger of two or more disk galaxies at the time that the metal-rich clusters were formed.

A spectroscopic study of moderately bright planetary nebulae

1979 ◽  
Vol 62 (2) ◽  
pp. 397-437 ◽  
Author(s):  
Lawrence H. Aller ◽  
Stanley J. Czyzak
Keyword(s):  
Spectroscopic Study ◽  
Planetary Nebulae

scholarly journals Two Southern Low Excitation Planetary Nebulae

1989 ◽  
Vol 131 ◽  
pp. 51-51
Author(s):  
H. Moreno ◽  
A. Gutiérrez-Moreno ◽  
G. Cortés
Keyword(s):  
Spectroscopic Study ◽  
Planetary Nebulae ◽  
Symbiotic Stars ◽  
Emission Object

Within a spectroscopic study of some southern planetary nebulae, we have observed 32 objects. Some of them are symbiotic or suspected symbiotic stars, and one (He 2-61) is evidently not an emission object.

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