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27 April 2024 |
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Analysis of colour and polarimetric variability of RW Aur A in 2010-2018 | | A. Dodin
; K. Grankin
; S. Lamzin
; A. Nadjip
; B. Safonov
; D. Shakhovskoi
; V. Shenavrin
; A. Tatarnikov
; O. Vozyakova
; | | Date: |
1 Nov 2018 | | Abstract: | Results of $UBVRIJHKLM$ photometry and $VRI$ polarimetry of a young star RW
Aur A observed during unprecedented long and deep (up to $Delta V approx 5$
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 $V-R_{
m c},$ $V-I_{
m c}$ diagrams of the
star and a strong anticorrelation between $p$ and brightness were observed. But
the duration and the amplitude of the eclipses as well as the value and
orientation of polarization vector in our case differ significantly from that
of UXORs. We concluded 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
mass-loss rate of the dusty wind was $> 10^{-9}$ M$_odot$ yr$^{-1}.$ | | Source: | arXiv, 1811.0449 | | Services: | Forum | Review | PDF | Favorites | |
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