Detection of circular polarization and low-amplitude photometric variability of the white dwarf WD1748+508 |
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Authors: | K A Antonyuk S V Kolesnikov N V Pit G G Valyavin A F Valeev T E Burlakova G A Galazutdinov |
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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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