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Some Properties of Magnetic Variables

Published online by Cambridge University Press:  12 April 2016

Karl D. Rakoš

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It is certain, that the mechanism causing variations of the magnetic field and spectral lines in Ap stars must also cause variations in their luminosities. The light curves are synchronous with the magnetic variations and usually the maximum of the positive magnetic field strength coincides with the minimum of the light curve. In the past the oblique rotator theory was not able to explain easily such brightness change. There is no simple reason to suppose, that the brightness of the surface of a star would increase or decrease at one magnetic pole only. Since that time a few stars were found with some indications for secondary minima and maxima in the light curves, but the first established double wave in a light curve was recently found by H. M. MAITZEN and K. D. RAKOš in HD 125 248 (1970), see Figure 1. It is a very exciting result, only the light curve in yellow light shows two maxima and two minima. The light curves in blue and ultraviolet are very smooth and show no evidence for secondary waves.

Type
I. New Phenomena in Very Cool, or Very Young, or Very Peculiar Variables
Information
International Astronomical Union Colloquium , Volume 15: New Directions and Frontiers in Variable Stars Research , 1971 , pp. 59 - 62
Copyright
Copyright © Cambridge University Press 1971

References

Maitzen, H. M., und Rakoš, K. D., 1970, UBV Beobaehtungen des magnetischen Veränderlichen HD 125 248. stron. and Astrophys. 7, 10—16.Google Scholar
Rakoš, K. D., 1963, Photoelectric Investigation of Magnetic and Spectrum Variable Stars II. Lowell Obs. Bulletin No. 121, Vol. VI., No. 2.Google Scholar
Rakoš, K. D., 1962, Lichtclcktrisehe Beobaehtungen des magnetischen und spektrum-veränderlicnen Sternes HD 71 866. Z. f. Aph. 56, 153—160.Google Scholar