Abstract
We report the results of a polarimetric and photometric study of the cool white dwarf WD1748+508. Observations were performed during four consecutive nights on the telescopes of the Crimean Astrophysical Observatory. As a result, polarization was detected in the V band at the level of −0.36 ± 0.087% and the star was found to be photometrically variable with a period ranging from five hours to about two days. Throughout the entire observing set the variability amplitude was constant and equal to about 10 ± 1 mmag. Non-zero circular polarization directly indicates that the white dwarf has a global magnetic field with a strength of 10 MG or higher.We interpret the photometric variations found in this study in terms of rotationally modulated variability of magnetic properties of the star’s atmosphere.
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Original Russian Text©K.A. Antonyuk, S.V. Kolesnikov, N.V. Pit, G.G. Valyavin, A.F. Valeev, T.E. Burlakova, G.A. Galazutdinov, 2016, published in Astrofizicheskii Byulleten’, 2016, Vol. 71, No. 4, pp. 510–513.
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Antonyuk, K.A., Kolesnikov, S.V., Pit, N.V. et al. Detection of circular polarization and low-amplitude photometric variability of the white dwarf WD1748+508. Astrophys. Bull. 71, 475–478 (2016). https://doi.org/10.1134/S1990341316040106
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DOI: https://doi.org/10.1134/S1990341316040106