Planetary Nebulae, Pulsars and Binary Objects
Infrared photometry of southern planetary nebulae and emission-line objects
... We believe that there is no justification for the classification of AG Car and its associated ring nebula (of diameter some W) as a planetary nebula. All of the other objects plotted [r] ...
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Southern planetary nebulae
... tude, yet narrow-band filters have to be employed in measuring them. In some parts of the work it is important to have a comparison with galactic objects. The distribution of planetaries along the southern Milky ...
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New Candidate Planetary Nebulae in the IPHAS Survey: the Case of Planetary Nebulae with ISM interaction
... small nebulae also show signs of ...“old” nebulae. We also observe that large objects mainly lie at higher latitudes than smaller nebulae but it is also interesting to notice that we detect ...
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Reconstruction and visualization of planetary nebulae
... astronomical objects is, in general, very challenging to ...astronomical objects, however, spatial structure can be recovered from conventional 2D images ...So-called planetary nebulae (PNe) ...
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Dynamics of the galactic bulge using planetary nebulae
... A spiral galaxy consists of a relatively flattened stellar disk in nearly circular rotation and, in most systems, a central bulge. It is estimated that about 30 % of these galaxies also show a central bar; however the ...
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KINEMATIC AGES OF THE CENTRAL STARS OF PLANETARY NEBULAE
... © Copyright 2011: Instituto de Astronomía, Universidad Nacional Autónoma de México Fig. 1. Age distribution of CSPN, Method 1, Sample 1. The similarity of the results of both methods is remarkable, especially considering ...
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Stellar Evolution from AGB to Planetary Nebulae
... do binary evolution, magnetic fields, or rotation play in the launching, collimation, and precession of the fast outflow? Are these circumstellar asymmetry in any way related to the asymmetry generated by ...
PLANETARY NEBULAE AND THE CHEMICAL EVOLUTION OF THE MAGELLANIC CLOUDS
... tary nebulae, HII regions and blue compact galax- ies, it was suggested that the origin of the “sulfur anomaly” is probably linked to the presence of S +3 ions, which would affect the total sulfur abundances, at ...
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Ionization Structure of Heavy Metals for Planetary Nebulae
... on planetary nebulae since these best tracks used to study the chemical evolution of the interstellar ...emission-line objects such as planetary nebulae shown ...
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Constrained inverse volume rendering for planetary nebulae
... cal objects is a challenging task, given that terrestrial observations provide only one ...bipolar planetary neb- ulae are interesting objects of study because of their pronounced axial symmetry due ...
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Quantitative classification of WR nuclei of planetary nebulae,
... Improbably high masses are obtained for some WO stars, im- plying that we probably use underestimated values of V ∞ for these very hot CSPNe. From Table 3 we extract all CSPNe for which the tempera- ture, the V ...
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Herschel Planetary Nebula Survey (HerPlaNS). First detection of OH$+ in planetary nebulae
... 2001). Either the density of OH decreases (e.g. by photoionisa- tion) or the velocity coherence is lost in the evolution. The OH + excitation diagrams for our three objects are shown in Fig. 7. The PACS and SPIRE ...
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Rebrightening of Planetary Nebulae Through Interaction with the Interstellar Medium
... Further study of rebrightened PN and their sur- roundings can provide considerable information regard- ing several other research avenues. As highlighted in the opening paragraph, tracing the ejected mass in cir- ...
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Multiwavelength Imaging of Planetary Nebulae: Resolving & Disentangling Structure
... X-RAY DATA AND ANALYSIS 2.1 X-rays To observe hot objects such as massive stars, AGN, or the hot bubbles within PNe, we look for X-ray emission. Unfortunately, this part of the electromagnetic spectrum is heavily ...
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Classification of Planetary Nebulae through Deep Transfer Learning
... Although this is a reasonable result, morphological classification would benefit from better images than available from the surveys we used. For future research, there are several aspects that can improve on the current ...
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Cool Wolf-Rayet central stars and their planetary nebulae
... cool objects, so th a t we can only take educated guesses at how much mass is lost during the AGB, based on the properties of the surrounding dust, knowledge of which is in itself pretty ...
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The interaction of planetary nebulae and their asymptotic giant branch progenitors with the interstellar medium
... In our simulations, we have varied three parameters: relative ve- locity of the star to the surrounding ISM v ISM , slow wind mass-loss rate ˙ M sw and ISM density ρ ISM . Binney & Merrifield (1998) dis- cussed v ISM of ...
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Chromodynamical analysis of lenticular galaxies using globular clusters and planetary nebulae
... σ (km/s) (c) NGC 7457 Figure 4. Rotation profiles and velocity dispersion for GCs and PNe obtained through the likelihood analysis, considering a one- component kinematic model. Vertical error bars are uncertain- ties ...
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Understanding the evolution of close binary systems with radio pulsars
... In Figure 3 , CBSs with P i & 1 day evolve toward the P (M 2 ) relation. If irradiation feedback is considered, there are stages at which the CBS is detached while the track passes through a region populated by ...
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A radio-continuum and photoionization-model study of the two planetary nebulae in the Sagittarius dwarf galaxy
... Given that these objects are the closest extragalactic PNe ever identified [distance to Sagittarius is taken as 25kpc (Ibata et al. 1995), although Mateo (1998) gives 24kpc] and belong t[r] ...
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