Angular Diameters of Magellanic Cloud Planetary Nebulae Obtained using Speckle Interferometry

1985 ◽  
Vol 6 (1) ◽  
pp. 54-55
Author(s):  
P. R. Wood ◽  
M. S. Bessell ◽  
M. A. Dopita
Keyword(s):  
Small Diameter ◽  
Planetary Nebulae ◽  
Speckle Interferometry ◽  
Mean Value ◽  
Magellanic Cloud ◽  
Angular Diameter ◽  
Ionized Gas ◽  
The Masses ◽  
Lower Limits ◽  
Angular Diameters

AbstractAngular diameters of Magellanic Cloud planetary nebulae obtained using speckle interferometry on the AAT are presented. The mass of ionized gas in each nebula is derived from the angular diameter and published Hβ line fluxes; the derived masses range from 0.005M⊙ to 0.19M⊙, with a mean value of 0.08M⊙. All the planetary nebulae observed are relatively small (diameter ≲0.13pc), young (age ≲ 2500 years), bright and dense. They are therefore almost certainly only partially ionized, so that the masses derived for the ionized parts of the nebula are lower limits to the total nebula mass.

Angular diameters and fluxes of Magellanic Cloud planetary nebulae. II - High-speed direct imaging

1987 ◽  
Vol 320 ◽  
pp. 178 ◽  
Author(s):  
P. R. Wood ◽  
S. J. Meatheringham ◽  
M. A. Dopita ◽  
D. H. Morgan
Keyword(s):  
High Speed ◽  
Planetary Nebulae ◽  
Magellanic Cloud ◽  
Direct Imaging ◽  
Angular Diameters

scholarly journals Digital Speckle Interferometry to Measure the Angular Diameters Of Faint Objects

1979 ◽  
Vol 50 ◽  
pp. 28-1-28-8 ◽  
Author(s):  
Gene Hubbard ◽  
Mike Reed ◽  
Peter Strittmatter ◽  
Keith Hege ◽  
Simon P. Worden
Keyword(s):  
Speckle Interferometry ◽  
Angular Diameter ◽  
University Of Arizona ◽  
Saturn’S Satellites ◽  
Digital Speckle ◽  
The University ◽  
Angular Diameters

AbstractWe have developed a digital speckle camera for use on the University of Arizona 90-inch telescope. This camera uses a CID detector to provide photon locations in an image, or an analog image for brighter objects. We have used this system to observe Saturn's satellites Rhea and Iapetus. Using a correlation speckle technique, we have determined the angular diameter of these objects to be 1487 ± 40 km for Rhea, and 1200 ± 132 km for Iapetus.

scholarly journals Mean Electron Densities, Distances and Filling Factors for Galactic Planetary Nebulae

1993 ◽  
Vol 155 ◽  
pp. 185-185
Author(s):  
Robin L. Kingsburgh ◽  
M.J. Barlow
Keyword(s):  
Planetary Nebulae ◽  
Magellanic Cloud ◽  
Electron Densities ◽  
Angular Diameters

Mean electron densities are presented for over 100 planetary nebulae (PN). Distances to the majority of these PN are then derived, based on calibrations from observations of Magellanic Cloud PN. Absolute radii and filling factors have also been determined. A trend is seen in that for larger radii, smaller filling factors are found, however we show that such a trend results from uncertainties in the observed angular diameters.

scholarly journals Planetary nebulae and Wolf-Rayet stars in the Magellanic Clouds

1964 ◽  
Vol 20 ◽  
pp. 316-321 ◽  
Author(s):  
B. E. Westerlund
Keyword(s):  
Planetary Nebula ◽  
Large Scale ◽  
Planetary Nebulae ◽  
Magellanic Cloud ◽  
Magellanic Clouds ◽  
Small Magellanic Cloud ◽  
Solar Mass ◽  
The Masses

Objects in the Small Magellanic Cloud classified by Lindsay (1961) as planetary nebulae or probable planetary nebulae have been studied in detail on large-scale photographs (Henize and Westerlund 1963). Of Lindsay's 50 objects, 11 are clearly resolved, 2 are probably resolved, 12 show stellar images, 13 are below the limit of the plates, 11 (fairly faint) are outside the photographed regions, and 1 is of uncertain identification. The masses of the resolved nebulae lie between 2 and 33 solar masses. They are therefore classified as small diffuse nebulae; it appears unlikely that the mass of a planetary nebula can exceed a few tenths of a solar mass.

scholarly journals Planetary Nebulae in the Magellanic Clouds

1983 ◽  
Vol 103 ◽  
pp. 427-442 ◽  
Author(s):  
George H. Jacoby
Keyword(s):  
Planetary Nebulae ◽  
Magellanic Cloud ◽  
Magellanic Clouds ◽  
Population Abundance ◽  
Older Population ◽  
The Masses

The identification and masses of Magellanic Cloud planetary nebulae are discussed. The masses are shown to be uncertain and should not be directly compared to values for galactic planetaries.The kinematics suggest that the planetary nebulae belong to a younger rather than an older population. Abundance analyses show the Magellanic Cloud planetaries to be deficient in most elements, but the abundances of helium and carbon are comparable to values found for galactic planetaries.

scholarly journals Radio planetary nebulae in the Small Magellanic Cloud

2016 ◽  
Vol 361 (3) ◽  
Author(s):  
Howard Leverenz ◽  
Miroslav D. Filipović ◽  
I. S. Bojičić ◽  
E. J. Crawford ◽  
J. D. Collier ◽  
...  
Keyword(s):  
Planetary Nebulae ◽  
Magellanic Cloud ◽  
Small Magellanic Cloud
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