OGLE-ing the Magellanic System: RR Lyrae Stars in the Bridge
  We use the extended and updated OGLE Collection of Variable Stars to
thoroughly analyze distribution of RR Lyrae stars in the Magellanic Bridge. We
use photometric metallicities to derive absolute Wesenheit magnitude and then
individual distance of each RR Lyr star. We confirm results from our earlier
study showing that RR Lyr stars are present in between the Magellanic Clouds,
though their three-dimensional distribution rather resembles two extended
overlapping structures than a strict bridge-like connection. The contours do
connect in the southern parts of the Bridge, albeit on a too low level to state
that there exists an evident connection. To test the sample numerically, we use
multi-Gaussian fitting and conclude that there is no additional population or
overdensity located in the Bridge. We also try to reproduce results on putative
RR Lyr Magellanic Bridge stream by selecting RR Lyr candidates from Gaia Data
Release 1. We show that we are not able to obtain the evident connection of the
Clouds without many spurious sources in the sample, as the cuts are not able to
remove artifacts and not eliminate the evident connection at the same time.
Moreover, for the first time we present the Gaia Data Release 2 RR Lyr stars in
the Magellanic Bridge area and show that their distribution matches our
results.
