German astronomers of the University of Gottingen conducted observations of the recently open polar J1832.4-1627, which turned out to be unique among the space objects of this kind. The results of the study reported in the article published in the repository ARXIV.ORG. Briefly about scientific work is described in a press release on PHYS.ORG.
pools are called a special type of magnetized cataclysmatic variables – double systems in which white dwarf pulls (accreationally) the substance from the companion star, most often the red giant, resulting in a disk. From time to time, the variable brightness increases several times, after which the rest period follows. In intermediate pools, in which the white dwarf has a magnetic field of moderate power, the accretion disk is either truncated or absent at all. In the latter case, the accretion flow alternates both poles of white dwarf (this is called the switching of poles or Pole Flipping), but such polars have not yet been discovered.
J1832.4, which was discovered in July 2019, the Observatory Kalar-Alto in Spain is located at a distance of 4100-9300 light years from the Earth and is an intermediate polar. For three seasons of observations, scientists did not find signs of the presence of a accretion disk. Astronomers recorded the light emanating from two accretion points on the White Dwarf, which indicates that the flow of the substance from the red giant decides alternately on both poles. In this case, the absence of an accretion disk and the observed flow switching in J1832.4 were not short-lived phenomena, that is, this is the characteristic property of the polar.
Thus, J1832.4 refers to deeply eclipant intermediate pools with an accretionary stream. In addition, this object demonstrates a variable absorption rate of a companion substance and repeatedly transforms into short-term states with minor accretion. Moreover, the orbital period of the double system seems to be reduced. Scientists conclude that for a better understanding of the polar behavior, further research is needed, especially X-ray observations, optical spectroscopy and spectropolarimetry.