Long photometric cycle and disk evolution in the $\beta$ Lyrae type binary OGLE-BLG-ECL-157529

Abstract

The subtype of hot algol semidetached binaries dubbed Double Periodic Variables (DPVs) are characterized by a photometric cycle longer than the orbital one, whose nature has been related to a magnetic dynamo in the donor component controlling the mass transfer rate. We aim to understand the morphologic changes observed in the light curve of OGLE-BLG-ECL-157529 that are linked to the long cycle. In particular, we want to explain the changes in relative depth of primary and secondary eclipses. We analyze $I$ and $V$-band OGLE photometric times series spanning 18.5 years and model the orbital light curve. We find that OGLE-BLG-ECL-157529 is a new eclipsing Galactic DPV of orbital period 24\fd8, and that its long cycle length decreases in amplitude and length during the time baseline. We show that the changes of the orbital light curve can be reproduced considering an accretion disk of variable thickness and radius, surrounding the hottest stellar component. Our models indicate changes in the temperatures of hot spot and bright spot during the long cycle, and also in the position of the bright spot. This, along with the changes in disk radius might indicate a variable mass transfer in this system.

8 pages, 14 figures, 2 tables, accepted for publication in Astronomy and Astrophysics

References in corpus (17)

• Gaia Data Release 2. Summary of the contents and survey properties
• The Gaia mission
• Estimating distances from parallaxes IV: Distances to 1.33 billion stars in Gaia Data Release 2
• The generalised Lomb-Scargle periodogram. A new formalism for the floating-mean and Keplerian periodograms
• Reddening and Extinction Toward the Galactic Bulge from OGLE-III: The Inner Milky Way's Rv ~ 2.5 Extinction Curve
• On Galactic density modeling in the presence of dust extinction
• The Gaia-ESO Survey: the Galactic Thick to Thin Disc transition
• Double-periodic blue variables in the Magellanic Clouds
• On the accretion disc and evolutionary stage of beta Lyrae
• A cyclic bipolar wind in the interacting binary V393 Scorpii
• The eclipsing LMC star OGLE05155332--6925581: a clue for Double Periodic Variables
• A dynamo mechanism as the potential origin of the long cycle in Double Periodic Variables
• Fundamental parameters of the close interacting binary HD170582 and its luminous accretion disc
• Structural changes in the hot Algol OGLE-LMC-DPV-097 and its disk related to its long-cycle
• The Applegate mechanism in Post-Common-Envelope Binaries: Investigating the role of rotation
• On the long cycle variability of the Algol OGLE-LMC-DPV-065 and its stellar, orbital and disk parameters
• Evidence of active regions in the donor of the Algol-type binary V393 Scorpii and test for the dynamo model of its long cycle

Cited by in corpus (5)

• Model for the long and orbital brightness variability of the $\beta$ Lyrae type binary OGLE-BLG-ECL-157529
• V4142 Sgr: a Double Periodic Variable with an accretor surrounded by the accretion-disk's atmosphere
• Stellar and accretion disk parameters of the close binary HD 50526
• Photometric study of hot Algol-type binaries with long cycles
• Cyclic light variations and accretion disk evolution in the LMC eclipsing binary OGLE-LMC-DPV-062