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Characterization of High-polarization Stars and Blazars with DIPOL-1 at Sierra Nevada Observatory
J. Otero-Santos, V. Piirola, J. Escudero Pedrosa +6
We report here the performance and first results of the new multiband optical polarimeter DIPOL-1, installed at the Sierra Nevada Observatory 90 cm T90 telescope (SNO, Granada, Spa…
Peering into the tilted heart of Cyg X-1 with high-precision optical polarimetry
Vadim Kravtsov, Alexandra Veledina, Andrei V. Berdyugin +7
We present the high-precision optical polarimetric observations of black hole X-ray binary Cyg X-1, spanning several cycles of its 5.6 day orbital period. Week-long observations on…
High-precision broadband linear polarimetry of early-type binaries IV. Binary system of DH Cephei in the open cluster of NGC 7380
Yasir Abdul Qadir, Andrei V. Berdyugin, Vilppu Piirola +2
DH Cephei is a prominent O+O-type binary system in the NGC 7380 open cluster. Our high-precision multi-band polarimetry demonstrates synchronous linear polarization variations with…
High-precision broadband linear polarimetry of early-type binaries III. AO Cassiopeiae revisited
Yasir Abdul Qadir, Andrei V. Berdyugin, Vilppu Piirola +2
The fact that the O-type close binary star system AO~Cassiopeiae exhibits variable phase-locked linear polarization has been known since the mid-1970s. In this work, we re-observe…
Discovery of magnetic fields in five DC white dwarfs
Andrei V. Berdyugin, Vilppu Piirola, Stefano Bagnulo +2
About half of white dwarfs (WDs) evolve to the DC state as they cool; the others become DQ or (temporarily?) DZ WDs. The recent magnetic survey of the local 20 pc volume has establ…