English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

OGLE-LMC-DPV-065 is an interacting binary whose double-hump long photometriccycle remains hitherto unexplained. We analyze photometric time seriesavailable in archive datasets spanning 124 years and present the analysis ofnew high-resolution spectra. A refined orbital period is found of 10\fd0316267$\pm$ 0\fd56 without any evidence of variability. In spite of thisconstancy, small but significant changes in timings of the secondary eclipseare detected. We show that the long period continuously decreases from 350 to218 days during 13 years, then remains almost constant for about 10 years. Ourstudy of radial velocities indicates a circular orbit for the binary and yieldsa mass ratio of 0.203 $\pm$ 0.001. From the analysis of the orbital light curvewe find that the system contains 13.8 and 2.81 \msun\ stars of radii 8.8 and12.6 \rsun\ and absolute bolometric magnitudes -6.4 and -3.0, respectively. Theorbit semi-major axis is 49.9 \rsun\ and the stellar temperatures are 25460 Kand 9825 K. We find evidence for an optically and geometrically thick diskaround the hotter star. According to our model, the disk has a radius of 25\rsun, central and outer vertical thickness of 1.6 \rsun\ and 3.5 \rsun, andtemperature of 9380 K at its outer edge. Two shock regions located at roughlyopposite parts of the outer disk rim can explain the light curves asymmetries.The system is a member of the double periodic variables and its relativelyhigh-mass and long photometric cycle make it similar in some aspects to $\beta$Lyrae.

On the long cycle variability of the Algol OGLE-LMC-DPV-065 and its stellar, orbital and disk parameters