Analysis of colour and polarimetric variability of RW Aur A in 2010-2018статья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 10 апреля 2019 г.
Аннотация:The results of UBVRIJHKLM photometry and VRI polarimetry of a young star RW Aur A
observed during unprecedented long and deep (up to deltaV ≈ 5 mag) dimming events in 2010–
11 and 2014–18 are presented. The polarization degree p of RW Aur A at this period has
reached 30 per cent in the I band. As in the case of UX Ori-type stars (UXORs), the so-called
‘bluing effect’ in the colour–magnitude V versus V − R c , V − I c diagrams of the star and a
strong anticorrelation between p and brightness were observed. However, the duration and the
amplitude of the eclipses as well as the value and orientation of the polarization vector in our
case differ significantly from those of UXORs. We conclude that the dimmings of RW Aur A
occurred due to eclipses of the star and inner regions of its disc by the axisymmetric dust
structure located above the disc and created by the disc wind. Taking into account both
scattering and absorption of stellar light by the circumstellar dust, we explain some features
of the light curve and the polarization degree–magnitude dependence. We found that near the
period of minimal brightness the mass-loss rate of the dusty wind was >1e−9 Msun/yr.