Outstanding stellar microwave flares in 1986

O. B. Slee; G. J. Nelson; R. T. Stewart; A. E. Wright; D. L. Jauncey; Alan Vaughan; M. I. Large; John D. Bunton; W. L. Peters; S. G. Ryan

doi:10.1017/S1323358000021846

Outstanding stellar microwave flares in 1986

O. B. Slee, G. J. Nelson, R. T. Stewart, A. E. Wright, D. L. Jauncey, Alan Vaughan, M. I. Large, John D. Bunton, W. L. Peters, S. G. Ryan

Research output: Contribution to journal › Article › peer-review

Abstract

We describe bright microwave events that were first detected with the Parkes 64-m telescope at 8.4 or 22 GHz from six active-chromosphere stars. In some flares spectral data were obtained over a large frequency range from simultaneous measurements with the Parkes reflector (8.4 or 22 GHz), the Tidbinbilla interferometer (8.4 and 2.29 GHz), the Fleurs synthesis telescope (1.42 GHz) and the Molonglo Observatory synthesis telescope (0.843 GHz). Data on circular polarization were obtained from the Parkes observations at 8.4 GHz.

The stars were in a wide variety of evolutionary states, ranging from a single pre-main-sequence star (HD 36705), two RS CVn binaries (HD 127535, HD 128171), an Algol (HD 132742) and two apparently single K giants (HD 32918 and HD 196818). Their high brightness temperatures, positive spectral indices and low polarization are consistent with optically thick gyrosynchrotron emission from mildly relativistic electrons with average energies 0.5 to 3 MeV gyrating in inhomogeneous magnetic fields of 5 to 100 G.

Original language	English
Pages (from-to)	55-59
Number of pages	5
Journal	Proceedings astronomical society of australia
Volume	7
Issue number	1
DOIs	https://doi.org/10.1017/S1323358000021846
Publication status	Published - 1987

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@article{fd8c2d56befa49a69adb1ff665bac1fc,

title = "Outstanding stellar microwave flares in 1986",

abstract = "We describe bright microwave events that were first detected with the Parkes 64-m telescope at 8.4 or 22 GHz from six active-chromosphere stars. In some flares spectral data were obtained over a large frequency range from simultaneous measurements with the Parkes reflector (8.4 or 22 GHz), the Tidbinbilla interferometer (8.4 and 2.29 GHz), the Fleurs synthesis telescope (1.42 GHz) and the Molonglo Observatory synthesis telescope (0.843 GHz). Data on circular polarization were obtained from the Parkes observations at 8.4 GHz. The stars were in a wide variety of evolutionary states, ranging from a single pre-main-sequence star (HD 36705), two RS CVn binaries (HD 127535, HD 128171), an Algol (HD 132742) and two apparently single K giants (HD 32918 and HD 196818). Their high brightness temperatures, positive spectral indices and low polarization are consistent with optically thick gyrosynchrotron emission from mildly relativistic electrons with average energies 0.5 to 3 MeV gyrating in inhomogeneous magnetic fields of 5 to 100 G.",

author = "Slee, \{O. B.\} and Nelson, \{G. J.\} and Stewart, \{R. T.\} and Wright, \{A. E.\} and Jauncey, \{D. L.\} and Alan Vaughan and Large, \{M. I.\} and Bunton, \{John D.\} and Peters, \{W. L.\} and Ryan, \{S. G.\}",

year = "1987",

doi = "10.1017/S1323358000021846",

language = "English",

volume = "7",

pages = "55--59",

journal = "Proceedings astronomical society of australia",

issn = "0066-9997",

publisher = "C S I R O PUBLICATIONS",

number = "1",

}

TY - JOUR

T1 - Outstanding stellar microwave flares in 1986

AU - Slee, O. B.

AU - Nelson, G. J.

AU - Stewart, R. T.

AU - Wright, A. E.

AU - Jauncey, D. L.

AU - Vaughan, Alan

AU - Large, M. I.

AU - Bunton, John D.

AU - Peters, W. L.

AU - Ryan, S. G.

PY - 1987

Y1 - 1987

N2 - We describe bright microwave events that were first detected with the Parkes 64-m telescope at 8.4 or 22 GHz from six active-chromosphere stars. In some flares spectral data were obtained over a large frequency range from simultaneous measurements with the Parkes reflector (8.4 or 22 GHz), the Tidbinbilla interferometer (8.4 and 2.29 GHz), the Fleurs synthesis telescope (1.42 GHz) and the Molonglo Observatory synthesis telescope (0.843 GHz). Data on circular polarization were obtained from the Parkes observations at 8.4 GHz. The stars were in a wide variety of evolutionary states, ranging from a single pre-main-sequence star (HD 36705), two RS CVn binaries (HD 127535, HD 128171), an Algol (HD 132742) and two apparently single K giants (HD 32918 and HD 196818). Their high brightness temperatures, positive spectral indices and low polarization are consistent with optically thick gyrosynchrotron emission from mildly relativistic electrons with average energies 0.5 to 3 MeV gyrating in inhomogeneous magnetic fields of 5 to 100 G.

AB - We describe bright microwave events that were first detected with the Parkes 64-m telescope at 8.4 or 22 GHz from six active-chromosphere stars. In some flares spectral data were obtained over a large frequency range from simultaneous measurements with the Parkes reflector (8.4 or 22 GHz), the Tidbinbilla interferometer (8.4 and 2.29 GHz), the Fleurs synthesis telescope (1.42 GHz) and the Molonglo Observatory synthesis telescope (0.843 GHz). Data on circular polarization were obtained from the Parkes observations at 8.4 GHz. The stars were in a wide variety of evolutionary states, ranging from a single pre-main-sequence star (HD 36705), two RS CVn binaries (HD 127535, HD 128171), an Algol (HD 132742) and two apparently single K giants (HD 32918 and HD 196818). Their high brightness temperatures, positive spectral indices and low polarization are consistent with optically thick gyrosynchrotron emission from mildly relativistic electrons with average energies 0.5 to 3 MeV gyrating in inhomogeneous magnetic fields of 5 to 100 G.

U2 - 10.1017/S1323358000021846

DO - 10.1017/S1323358000021846

M3 - Article

SN - 0066-9997

VL - 7

SP - 55

EP - 59

JO - Proceedings astronomical society of australia

JF - Proceedings astronomical society of australia

IS - 1

ER -

Outstanding stellar microwave flares in 1986

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