Hostname: page-component-cd9895bd7-7cvxr Total loading time: 0 Render date: 2024-12-27T07:01:53.141Z Has data issue: false hasContentIssue false
  • English
  • Français

Radio Emission from Starspots on RSCVn Binary HR1099

Published online by Cambridge University Press:  25 April 2016

John D. Bunton ,
R. T. Stewart ,
O. B. Slee ,
G. J. Nelson ,
Alan E. Wright ,
Julian B. Corbin ,
David R. Brown  and
P. J. Hall
John D. Bunton
Affiliation:
Department of Electrical Engineering, University of Sydney
R. T. Stewart
Affiliation:
Division of Radiophysics, CSIRO, Sydney
O. B. Slee
Affiliation:
Division of Radiophysics, CSIRO, Sydney
G. J. Nelson
Affiliation:
Division of Radiophysics, CSIRO, Sydney
Alan E. Wright
Affiliation:
Division of Radiophysics, CSIRO, Sydney
Julian B. Corbin
Affiliation:
Department of Electrical Engineering, University of Sydney
David R. Brown
Affiliation:
Department of Electrical Engineering, University of Sydney
P. J. Hall
Affiliation:
Division of Radiophysics, CSIRO, Sydney
Get access Rights & Permissions [Opens in a new window]

Abstract

Properties of the microwave emission from HR1099 are examined in an attempt to determine whether the emission arises as gyro-synchrotron radiation from mildly relativistic electrons trapped in magnetic fields above starspots on the active K subgiant component. It is shown that radio curves do not exhibit a systematic variation in phase with the rotation rate, as one might expect for emission from a source situated above a long-lived starspot. However, there is some evidence that the radio flaring occurs at two preferred longitude zones. Whether these zones agree with starspot locations remains to be determined by light curve modelling. What we can say with confidence is that the measured spectral index of the microwave emission does not fit a simple gyro-synchrotron source model, such as that proposed to explain the observed reversal with frequency of the sense of circular polarization.

Type
Contributions
Information
Publications of the Astronomical Society of Australia , Volume 6 , Issue 3 , 1986 , pp. 316 - 319
Copyright
Copyright © Astronomical Society of Australia 1986

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Bartolini, C., Blanco, C., Catalano, S., Cerruti-Sola, M., Eaton, J. A., Guarnieri, A., Hall, D. S., Henry, G. W., Hopkins, J. L., Landis, H. J., Louth, H., Marilli, E., Piccioni, A., Renner, T. R., Rodono, M. and Scaltriti, F., 1983, Astron. Astrophys., 117, 149.Google Scholar
Bunton, J. D., Jones, I. G. and Brown, D. R., 1985, Proc. Astron. Soc. Aust., 6, 93.CrossRefGoogle Scholar
Dorren, J. D. and Guinan, E. F., 1982, Astrophys. J., 252, 296.CrossRefGoogle Scholar
Duik, G. A., 1985, Annu. Rev. Astron. Astrophys., 23, 169.Google Scholar
Fekel, F. C., 1983, Astrophys. J., 268, 274.CrossRefGoogle Scholar
Feldman, P. A., Taylor, A. R., Gregory, P. C., Seaquist, E. R., Balonek, T. J. and Cohen, N. L., 1978, Astron. J., 83, 1471.CrossRefGoogle Scholar
Gibson, D. M., Hicks, P. D. and Owen, F. N. 1978, Astron. J., 83, 1495.CrossRefGoogle Scholar
Gondoin, P., 1986, Astron. Astrophys., 160, 73.Google Scholar
Lestrade, J. -F, Mutel, R. L., Phillips, R. B., Webber, J. C., Niell, A. E. and Preston, R. A., 1984, Astrophys. J., 282, L23.CrossRefGoogle Scholar
Mutel, R. L., Lestrade, J. -F. and Doiron, D. J., 1985, Radio Stars, (eds. Hjellming, R. M. and Gibson, D. M.) (Reidel), p. 259.CrossRefGoogle Scholar
Nelson, G. J. and Stewart, R. T., 1979, Proc. Astron, Soc. Aust., 3, 392.CrossRefGoogle Scholar
Owen, F. N., Jones, T. W. and Gibson, D. M., 1976, Astrophys. J., 210, L27.CrossRefGoogle Scholar
Pallavicini, R., Willson, R. F. and Lang, V. R., 1985, Astron. Astrophys., 149, 95.Google Scholar
Vogt, S. S., 1981, The Physics of Sunspots (eds. Cram, L. and Thomas, J.) (Sacramento Peak Obs.), p. 455.Google Scholar
Vogt, S. S. and Penrod, D., 1983, Proc. Astron. Soc. pac., 95, 565.CrossRefGoogle Scholar