Particle acceleration and nonthermal radio emission in binaries of early-type stars

1993 ◽  
Vol 402 ◽  
pp. 271 ◽  
Author(s):  
D. Eichler ◽  
V. Usov
Keyword(s):  
Particle Acceleration ◽  
Radio Emission ◽  
Early Type ◽  
Nonthermal Radio ◽  
Nonthermal Radio Emission ◽  
Early Type Stars

scholarly journals Magnetic annihilation in colliding-wind binary systems

1995 ◽  
Vol 163 ◽  
pp. 523-524
Author(s):  
M. Jardine ◽  
H.R. Allen ◽  
A.M.T. Pollock
Keyword(s):  
Particle Acceleration ◽  
Radio Emission ◽  
Magnetic Reconnection ◽  
Stagnation Point ◽  
Binary Systems ◽  
Nonthermal Radio ◽  
Nonthermal Radio Emission ◽  
Reconnection Model

We investigate the possibility that a stagnation-point magnetic reconnection model may account for the particle acceleration necessary for the generation of nonthermal radio emission in the Wolf-Rayet binary systems exemplified by WR140.

scholarly journals Radio Evidence for Nonthermal Particle Acceleration in Normal Stars

2000 ◽  
Vol 195 ◽  
pp. 313-314
Author(s):  
K. R. Lang
Keyword(s):  
Particle Acceleration ◽  
High Resolution ◽  
Radio Emission ◽  
Spectral Type ◽  
Large Array ◽  
Very Large Array ◽  
Nonthermal Radio ◽  
Nearby Stars ◽  
Nonthermal Radio Emission

The Very Large Array has been used to detect nonthermal radio emission from nearby stars of late spectral type F, G, K, and M, and has provided unique high-resolution investigations of the Sun's radio emission.

Detection of Nonthermal Radio Emission from Coronal X-Ray Jets

1995 ◽  
Vol 447 (2) ◽  
Author(s):  
M. R. Kundu, ◽  
J. P. Raulin, ◽  
N. Nitta, ◽  
H. S. Hudson, ◽  
M. Shimojo, ◽  
...  
Keyword(s):  
Radio Emission ◽  
X Ray ◽  
Nonthermal Radio ◽  
Nonthermal Radio Emission

scholarly journals The auroral radio emission of the magnetic B-type star ρ OphC

2020 ◽  
Vol 499 (1) ◽  
pp. L72-L76
Author(s):  
P Leto ◽  
C Trigilio ◽  
C S Buemi ◽  
F Leone ◽  
I Pillitteri ◽  
...  
Keyword(s):  
Radio Emission ◽  
Indirect Evidence ◽  
Magnetic Star ◽  
Early Type ◽  
Radiation Beam ◽  
Polar Caps ◽  
Thermal Radio ◽  
Thermal Radio Emission ◽  
Early Type Stars ◽  
Rotational Phase

ABSTRACT The non-thermal radio emission of main-sequence early-type stars is a signature of stellar magnetism. We present multiwavelength (1.6–16.7 GHz) ATCA measurements of the early-type magnetic star ρ OphC, which is a flat-spectrum non-thermal radio source. The ρ OphC radio emission is partially circularly polarized with a steep spectral dependence: the fraction of polarized emission is about $60{{\ \rm per\ cent}}$ at the lowest frequency sub-band (1.6 GHz) while is undetected at 16.7 GHz. This is clear evidence of coherent Auroral Radio Emission (ARE) from the ρ OphC magnetosphere. Interestingly, the detection of the ρ OphC’s ARE is not related to a peculiar rotational phase. This is a consequence of the stellar geometry, which makes the strongly anisotropic radiation beam of the amplified radiation always pointed towards Earth. The circular polarization sign evidences mainly amplification of the ordinary mode of the electromagnetic wave, consistent with a maser amplification occurring within dense regions. This is indirect evidence of the plasma evaporation from the polar caps, a phenomenon responsible for the thermal X-ray aurorae. ρ OphC is not the first early-type magnetic star showing the O-mode dominated ARE but is the first star with the ARE always on view.

scholarly journals Evidence of a Weak Galactic Center Magnetic Field from Diffuse Low-Frequency Nonthermal Radio Emission

2005 ◽  
Vol 626 (1) ◽  
pp. L23-L27 ◽  
Author(s):  
T. N. LaRosa ◽  
C. L. Brogan ◽  
S. N. Shore ◽  
T. J. Lazio ◽  
N. E. Kassim ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Radio Emission ◽  
Galactic Center ◽  
Low Frequency ◽  
Nonthermal Radio ◽  
Nonthermal Radio Emission

scholarly journals Voyager Detection of Nonthermal Radio Emission from Saturn

Science ◽  
1980 ◽  
Vol 209 (4462) ◽  
pp. 1238-1240 ◽  
Author(s):  
M. L. KAISER ◽  
M. D. DESCH ◽  
J. W. WARWICK ◽  
J. B. PEARCE
Keyword(s):  
Radio Emission ◽  
Nonthermal Radio ◽  
Nonthermal Radio Emission

scholarly journals Radio and X-Ray Emissions from Chemically Peculiar B- and A-Type Stars: Observations and a Model

1993 ◽  
Vol 138 ◽  
pp. 507-516 ◽  
Author(s):  
Jeffrey L. Linsky
Keyword(s):  
Energy Source ◽  
Stellar Wind ◽  
Mechanical Energy ◽  
Early Type ◽  
Late Type ◽  
X Ray ◽  
Nonthermal Radio ◽  
Chemically Peculiar ◽  
Early Type Stars

AbstractConventional wisdom holds that early-type and late-type stars have very different outer atmospheres, because the early-type stars lack deep convective zones. I argue that the magnetic chemically peculiar (CP) stars hotter than about spectral type A2 display many of the activity phenomena seen in the most active late-type stars. In particular, many CP stars are luminous nonthermal radio and coronal x-ray sources like the RS CVn systems. A wind-fed magnetosphere model has been proposed to explain both the nonthermal radio and the x-ray emission. In this model the stellar wind plays the role of a mechanical energy source analogous to the role played by convection in the active late-type stars.

scholarly journals Radial distributions of constituents in M33, the Galaxy, and M51

1985 ◽  
Vol 106 ◽  
pp. 431-434
Author(s):  
Elly M. Berkhuijsen ◽  
Ulrich Klein
Keyword(s):  
Radio Emission ◽  
Blue Light ◽  
Column Density ◽  
Surface Brightness ◽  
Far Infrared ◽  
Abundance Ratio ◽  
Nonthermal Radio ◽  
The Galaxy ◽  
Nonthermal Radio Emission

The radial distributions of the surface brightness or column density of thermal and nonthermal radio emission, far-infrared (FIR) emission, blue light, HI and CO in the Sc galaxies M33 and M51 are compared with the corresponding distributions in the Galaxy. Information on the variation of the absorption at Hα and on the variation of the abundance ratio O/H is also shown.

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