scholarly journals Radio planetary nebulae in the Magellanic Clouds

2011 ◽  
Vol 7 (S283) ◽  
pp. 334-335 ◽  
Author(s):  
Evan J. Crawford ◽  
Miroslav D. Filipović ◽  
Ivan S. Bojičić ◽  
Martin Cohen ◽  
Jeff L. Payne ◽  
...  
Keyword(s):  
Planetary Nebulae ◽  
Magellanic Clouds ◽  
Radio Continuum ◽  
Preliminary Results ◽  
Compact Array

AbstractWe present preliminary results of our deep Australia Telescope Compact Array (ATCA) radio-continuum survey of the Magellanic Clouds Planetary Nebulae.

scholarly journals Radio and X-ray Study of SNRs in the Magellanic Clouds

1999 ◽  
Vol 192 ◽  
pp. 104-107
Author(s):  
M.D. Filipović ◽  
W. Pietsch ◽  
G. L. White ◽  
F. Haberl ◽  
L. Staveley-Smith ◽  
...  
Keyword(s):  
High Resolution ◽  
Supernova Remnants ◽  
Magellanic Clouds ◽  
Radio Continuum ◽  
H Ii Regions ◽  
Complete Sample ◽  
X Ray ◽  
Compact Array

We present our high-resolution radio-continuum and X-ray study of supernova remnants (SNRs) in the Magellanic Clouds (MCs). These investigations are based on Australia Telescope Compact Array (ATCA) radio-continuum and ROSAT X-ray observations. Our main aim is to study a complete sample of the MC SNRs and H II regions.

scholarly journals Spectroscopic Observations of Planetary Nebulae in the Magellanic Clouds

1968 ◽  
Vol 34 ◽  
pp. 34-35 ◽  
Author(s):  
M. W. Feast
Keyword(s):  
Planetary Nebulae ◽  
Magellanic Clouds ◽  
Preliminary Results ◽  
Spectroscopic Observations

A programme of spectroscopic observations of planetary nebulae in both Magellanic Clouds has been underway in Pretoria for some years, and some preliminary results for the LMC have been published (Feast, 1964b). More extensive observations are now available (altogether in both clouds 112 spectra of 39 objects), and these are being prepared for publication elsewhere. Below are summarized the main conclusions so far deduced.

scholarly journals Galactic Dust Distribution in the Solar Neighborhood

1973 ◽  
Vol 52 ◽  
pp. 237-241
Author(s):  
J. H. Cahn ◽  
R.D. Nosek
Keyword(s):  
Electron Temperature ◽  
Planetary Nebulae ◽  
Magellanic Clouds ◽  
Distance Scale ◽  
Solar Neighborhood ◽  
Radio Continuum ◽  
The Sun ◽  
Constant Mass ◽  
Dust Distribution

Using the Shklovsky-Minkowski-Aller constant mass method of distances to planetary nebulae, a model of the Galactic dust distribution in the vicinity of the Sun has been determined. Distances are determined in part from extinctions derived from radio continuum to Hβ flux ratios for an assumed electron temperature of 7000 K. The distance scale is based on the brightness of planetary nebulae in the Magellanic Clouds (Seaton, 1968).

scholarly journals Magnetic fields and radio emission processes in maser-emitting planetary nebulae

2017 ◽  
Vol 13 (S336) ◽  
pp. 397-398
Author(s):  
L. Uscanga ◽  
J. F. Gómez ◽  
J. A. Green ◽  
O. Suárez ◽  
H.-H. Qiao ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Radio Emission ◽  
Ground State ◽  
Planetary Nebulae ◽  
State Transitions ◽  
Preliminary Results ◽  
Shaping Process ◽  
The Magnetic Field ◽  
Compact Array

AbstractWe present polarimetric observations of the 4 ground-state transitions of OH, toward a sample of maser-emitting planetary nebulae (PNe) using the Australia Telescope Compact Array. This sample includes confirmed OH-emitting PNe, confirmed and candidate H2O-maser-emitting PNe. Polarimetric observations provide information related to the magnetic field of these sources. Maser-emitting PNe are very young PNe and magnetic fields are a key ingredient in the early evolution and shaping process of PNe. Our preliminary results suggest that magnetic field strengths may change very rapidly in young PNe.

scholarly journals Binary interactions on the RGB: Dusty post-RGB stars

2016 ◽  
Vol 12 (S323) ◽  
pp. 223-226
Author(s):  
Devika Kamath ◽  
Hans Van Winckel ◽  
Peter Wood
Keyword(s):  
Radial Velocity ◽  
Planetary Nebula ◽  
Planetary Nebulae ◽  
Magellanic Cloud ◽  
Magellanic Clouds ◽  
Binary Interaction ◽  
Small Magellanic Cloud ◽  
Preliminary Results ◽  
Low Metallicity ◽  
Binary Evolution

AbstractIt is widely accepted that binary interactions are responsible for the shaping of planetary nebula. However, these binary interactions and evolutionary channels are poorly understood. Our recent study revealed a newly discovered population of low-luminosity, low-metallicity, likely binaries in the Magellanic Clouds: dusty post-RGB stars. They are likely to have evolved off the RGB via binary interaction. In this paper we present preliminary results of the first radial velocity monitoring of the post-RGB stars in the Small Magellanic Cloud (SMC) and the implications on stellar (binary) evolution. We also investigate their link, if any, to the planetary nebulae systems.

scholarly journals Optical spectra of radio planetary nebulae in the small Magellanic cloud

2008 ◽  
pp. 65-70 ◽  
Author(s):  
J.L. Payne ◽  
M.D. Filipovic ◽  
E.J. Crawford ◽  
Horta de ◽  
G.L. White ◽  
...  
Keyword(s):  
South Africa ◽  
High Resolution ◽  
Planetary Nebulae ◽  
Optical Spectra ◽  
Magellanic Cloud ◽  
Radio Sources ◽  
Small Magellanic Cloud ◽  
Preliminary Results ◽  
Central Stars ◽  
Compact Array

We present preliminary results from spectral observations of four (4) candidate radio sources co-identified with known planetary nebulae (PNe) in the Small Magellanic Cloud (SMC). These were made using the Radcliffe 1.9-meter telescope in Sutherland, South Africa. These radio PNe were originally found in Australia Telescope Compact Array (ATCA) surveys of the SMC at 1.42 and 2.37 GHz, and were further confirmed by new high resolution ATCA images at 6 and 3 cm (400 /200 ). Optical PNe and radio candidates are within 200 and may represent a sub- population of selected radio bright objects. Nebular ionized masses of these objects may be 2.6 Mo or greater, supporting the existence of PNe progenitor central stars with masses up to 8 Mo.

scholarly journals ATCA radio observations of compact planetary nabulae

2011 ◽  
Vol 7 (S283) ◽  
pp. 380-381
Author(s):  
Marcin Hajduk ◽  
Albert A. Zijlstra
Keyword(s):  
Planetary Nebulae ◽  
Interstellar Extinction ◽  
Radio Continuum ◽  
Galactic Bulge ◽  
Radio Observations ◽  
Compact Array

AbstractWe present new observations in the radio continuum of 31 planetary nebulae at 5 and 8 GHz with the Australian Telescope Compact Array. The observations are used to invesigate properties of the interstellar extinction toward Galactic Bulge.

scholarly journals Radio Continuum Observations of Southern Planetary Nebulae Candidates

1993 ◽  
Vol 155 ◽  
pp. 40-40
Author(s):  
G.C. Van De Steene ◽  
S.R. Pottasch
Keyword(s):  
Point Source ◽  
Planetary Nebulae ◽  
Radio Continuum ◽  
Continuum Emission ◽  
Ionized Gas ◽  
High Brightness ◽  
Brightness Temperatures ◽  
Compact Array

In an attempt to find new Planetary Nebulae we have short radio continuum observations at 6 cm and 3 cm of 90 PN candidates with the Australian Compact Array. We selected the unidentified objects from the IRAS Point Source Catalogue on basis of their PN colors. Detection of radio continuum emission at the IRAS position almost certainly confirms that these objects are PN, because it indicates the presence of ionized gas. Therefore the 18 detected sources are considered new PN. Because of their high brightness temperatures, they are probably young PN.

scholarly journals Planetary Nebulae Near the Galactic Center I: Method of Discovery and Preliminary Results

1989 ◽  
Vol 131 ◽  
pp. 63-63
Author(s):  
S. R. Pottasch ◽  
C. Bignell ◽  
R. Olling ◽  
A. A. Zijlstra
Keyword(s):  
Galactic Center ◽  
Planetary Nebulae ◽  
Far Infrared ◽  
Transition Phase ◽  
Radio Continuum ◽  
Preliminary Results ◽  
Ir Stars ◽  
First Results

A method is described for finding planetary nebulae. Use is made of the far infrared IRAS colors and radio continuum measurements. The method is applied here to a region within 15° of the galactic center. The first results are given, including 36 new PN. The characteristics of the nebulae are described. While they are generally similar to known nebulae, the method of selection gives an emphasis to younger objects. A substantial number of the new nebulae may be in the transition phase between OH/IR stars and PN.

scholarly journals Radio continuum observations of massive stars in open cluster NGC 6231 and the Sco OB1 association

2003 ◽  
Vol 212 ◽  
pp. 230-231 ◽  
Author(s):  
Diah Y.A. Setia Gunawan ◽  
Jessica M. Chapman ◽  
Ian R. Stevens ◽  
Gregor Rauw ◽  
Claus Leitherer
Keyword(s):  
Massive Stars ◽  
Open Cluster ◽  
Radio Continuum ◽  
Spectral Indices ◽  
Program Show ◽  
Compact Array

We present results of the Australia Telescope Compact Array (ATCA) radio continuum observations of massive stars in the Sco OB1 association. Most stars detected in the program show spectral indices lower than value expected from thermal free-free emission.

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