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An Optlcal and Radio Investigation of the Active RS CVn Star HD 127535

Published online by Cambridge University Press:  25 April 2016

J. L. Innis ,
D. W. Coates ,
K. Thompson ,
G. J. Nelson ,
O. B. Slee  and
Alan E. Wright
J. L. Innis
Affiliation:
Department of Physics, Monash University
D. W. Coates
Affiliation:
Department of Physics, Monash University
K. Thompson
Affiliation:
Department of Physics, Monash University
G. J. Nelson
Affiliation:
Division of Radiophysics, CSIRO, Sydney
O. B. Slee
Affiliation:
Division of Radiophysics, CSIRO, Sydney
Alan E. Wright
Affiliation:
Division of Radiophysics, CSIRO, Sydney
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Abstract

We present some preliminary results of an optical and radio study of the very active RS CVn binary HD 127535. Photometric measurements show the presence of a large amplitude wave which exhibits marked changes in shape and range on time scales as short as a few months. This photometric variation is almost certainly due to large cool starspots on the cooler, more luminous component. As part of a survey of southern active-chromosphere stars with the Parkes radio telescope, HD 127535 has been observed at 5, 8.4 and 22 GHz. No detection was made at 5 GHz, possibly because of confusion due to the angular proximity of the star to the galatic plane. However, it is one of the strongest sources detected in the 8.4 GHz survey, and is one of only two stars detected at 22 GHz. Photometry obtained two cycles before the 8.4 GHz observations suggest a possible correlation between the radio emission and the photometric wave, i.e. spot visibility, but more data are needed.

Type
Contributions
Information
Publications of the Astronomical Society of Australia , Volume 6 , Issue 2 , 1985 , pp. 160 - 164
Copyright
Copyright © Astronomical Society of Australia 1985

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