Observations for broad-band circular polarization in white dwarfs and nuclei of planetary nebulae.

1974 ◽  
Vol 190 ◽  
pp. 117 ◽  
Author(s):  
A. Rich ◽  
W. L. Williams
Keyword(s):  
Circular Polarization ◽  
White Dwarfs ◽  
Broad Band ◽  
Planetary Nebulae

scholarly journals Magnetism in white Dwarfs

1971 ◽  
Vol 46 ◽  
pp. 234-236
Author(s):  
J. D. Landstreet ◽  
J. R. P. Angel
Keyword(s):  
Circular Polarization ◽  
White Dwarf ◽  
White Dwarfs ◽  
Zeeman Effect ◽  
Broad Band ◽  
Dwarf Stars ◽  
White Dwarf Stars ◽  
Quadratic Zeeman Effect ◽  
Positive Effect

Searches have been made for the normal and quadratic Zeeman effect and broad-band circular polarization in white dwarf stars. A positive effect has been found in Grw + 70°8247 whose continuum shows both linear and circular polarization.

scholarly journals 13. The Polarization of Radiation from White Dwarfs

1971 ◽  
Vol 42 ◽  
pp. 79-80 ◽  
Author(s):  
J. R. P. Angel ◽  
J. D. Landstreet
Keyword(s):  
Circular Polarization ◽  
White Dwarf ◽  
Time Scale ◽  
White Dwarfs ◽  
Optical Radiation ◽  
Broad Band ◽  
Mean Value ◽  
Circularly Polarized ◽  
Polarization Of Radiation ◽  
The Continuum

During the course of two observational programs to search for magnetic fields in white dwarfs (Angel and Landstreet, 1970a; Kemp, 1970), it was discovered by Kemp and Swedlund (Kemp et al., 1970b) that the continuum optical radiation from the λ4135 type white dwarf Grw + 70° 8247 is circularly polarized. This circular polarization was measured in a broad band from about 4000 to 7000 Å a number of times; in this band the circular polarization does not appear to vary from its mean value of 3.29% with an amplitude of more than about 0.1% (or 3% of the measured mean polarization) on any time scale from 24 seconds to 2 weeks (Angel and Landstreet, 1970b).

scholarly journals A broad-band wide-angle linear-to-circular polarization converter based on stripline metasurface

IEEE Access ◽  
2021 ◽  
pp. 1-1
Author(s):  
Zuning Yang ◽  
Tiesheng Wu ◽  
Shunlan Zhang ◽  
Zhihui Liu ◽  
Dan Yang ◽  
...  
Keyword(s):  
Circular Polarization ◽  
Broad Band ◽  
Wide Angle ◽  
Polarization Converter

The Effect of Magnetic Field Spread and Temperature and Density Variations in Cyclotron Emission Regions

1987 ◽  
Vol 7 (2) ◽  
pp. 123-127 ◽  
Author(s):  
D. T. Wickramasinghe ◽  
Lilia Ferrario
Keyword(s):  
Magnetic Field ◽  
Point Source ◽  
Circular Polarization ◽  
White Dwarfs ◽  
Type Systems ◽  
Polar Cap ◽  
Cyclotron Radiation ◽  
Cyclotron Emission ◽  
Source Models ◽  
Accretion Shocks

AbstractWe discuss the properties of cyclotron radiation from accretion shocks located above the atmospheres of magnetic white dwarfs taking into account the effects of field spread and density and temparture structure. The models which are an improvement on previous point source models are shown to have characteristics that are in better overall agreement with the properties of AM Herculis type systems. Our calculations of the polarization properties of large polar cap emission regions are used to discuss the recent null measurements of circular polarization in DQ Herculis type systems.

scholarly journals Family links between Planetary Nebulae nuclei and cataclysmic variables, binary white dwarfs, R CrB stars, and SNe IA

1997 ◽  
Vol 180 ◽  
pp. 85-90
Author(s):  
L.R. Yungelson ◽  
A.V. Tutukov
Keyword(s):  
White Dwarfs ◽  
Cataclysmic Variables ◽  
Planetary Nebulae ◽  
Close Binaries ◽  
Symbiotic Stars

We analyse the population of PNe and links between binary PNNi and stars which are in the later evolutionary stages. In a model which assumes that all stars are born in binaries, about 16% of PN result from ejection of common envelopes in close binaries, 85% of single PNNi are formed by merger of components of binaries. In the model, 5% of PNNi may be precataclysmic binaries, 5% may be precursors of symbiotic stars, 0.4% may be pre-SN Ia, 0.1% - precursors of hydrogen-deficient giants. About 0.1% of all PNe may be hydrogen-deficient.

scholarly journals Ultraviolet emission line imaging of planetary nebulae with GALEX

2011 ◽  
Vol 7 (S283) ◽  
pp. 308-309 ◽  
Author(s):  
Luciana Bianchi ◽  
Arturo Manchado ◽  
Karl Forster
Keyword(s):  
Galaxy Evolution ◽  
Broad Band ◽  
Planetary Nebulae ◽  
Emission Lines ◽  
Continuum Emission ◽  
Ultraviolet Emission ◽  
The Galaxy ◽  
Optical Domain ◽  
Line Imaging ◽  
Shock Fronts

AbstractGALEX (the Galaxy Evolution Explorer) has provided far-UV(1344-1786Å) and near-UV(1771-2831Å) imaging of several Planetary Nebulae (e.g., Bianchi et al. 2008, Bianchi 2012), with flux limits ~27.5 mag/sq.arcsec for objects in the Medium-deph Imaging Survey (MIS). PNe images in the GALEX broad-band UV filters include flux from both nebular line and continuum emission. We use the GALEX grism observing mode to obtain slitless spectral imaging of a sample of PNe with diameters >1′, in the near-UV. We show the first data from this program. The grism produces 2D images of the prominent UV nebular emission lines, when such lines dominate the flux. Combined with monochromatic images of diagnostic lines in the optical domain, such data help detect and interpret ionization and shock fronts, especially in faint nebular regions.

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