In addition, magnetic fields have been inferred in $\beta$ Lyrae from the analysis of polarized light that could produce magnetically driven streams onto the accretion disk [@1982SvAL....8..126S; @2018CoSka..48..300S].

Significant changes have been detected in the morphology of the light curve of OGLE-LMC-DPV-097 that are directly related to the long cycle [@Garces2018]. These authors show that this kind of variability could be due to physical changes of the accretion disk, which would change its diameter and thickness cyclically according to the phase of the long cycle. If the long cycle reflects changes in the mass transfer rate, we might expect changes in disk properties too, since the disk interacts with the gas stream.

\[1\][![image](IVbands.pdf){width="18cm"}]{}

In this study we show the photometric analysis of a Galactic DPV binary system that presents a variable long cycle, viz. OGLE-BLG-ECL-157529 ($\alpha_{2000}$=17:53:08.33, $\delta_{2000}$=$-$32:46:27.0, $I$= 13.035 mag, $V$= 14.829 mag, @Soszynski2016). It is the first DPV reported in the direction of the Galactic bulge. The Gaia DR2 identification is 4043437999622564608 and its parallax is 0.331 $\pm$ 0.044 mas, implying a distance of 3024 $\pm$ 406 pc . This distance fits well to that provided by @2018AJ....156...58B, viz.2815 pc with lower limit at 2487 pc and upper limit 