University of Oulu

R E Mennickent, M Cabezas, G Djurašević, T Rivinius, P Hadrava, R Poleski, I Soszyński, L Celedón, N Astudillo-Defru, A Raj, J G Fernández-Trincado, L Schmidtobreick, C Tappert, V Neustroev, I Porritt, On the long-cycle variability of the Algol OGLE-LMC-DPV-065 and its stellar, orbital, and disc parameters, Monthly Notices of the Royal Astronomical Society, Volume 487, Issue 3, August 2019, Pages 4169–4180,

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

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Author: Mennickent, R. E.1; Cabezas, M.1,2; Djurašević, G. G.3,4;
Organizations: 1Universidad de Concepcíon, Departamento de Astronomía, Casilla 160-C, Concepcíon, Chile
2Astronomical Institute of the Academy of Sciences of the Czech Republic, Bocní II 1401/1, Prague, 141 00, Czech Republic
3Astronomical Observatory, Volgina 7, 11060 Belgrade 38, Serbia
4Isaac Newton Institute of Chile, Yugoslavia Branch
5ESO - European Organization for Astronomical Research in the Southern Hemisphere, Casilla 19001, Santiago 19, Chile
6Department of Astronomy, Ohio State University, 140 W. 18th Ave., Columbus, OH 43210, USA
7Warsaw University Observatory, Al. Ujazdowskie 4, PL-00-478 Warszawa, Poland
8Departamento de Matematíca y Física Aplicadas, Universidad Catolica de la Santísima Concepcion, Alonso de Rivera 2850, Concepcion, Chile
9Indian Institute of Astrophysics, II Block Koramangala, Bangalore 560034, India
10Institut Utinam, CNRS UMR6213, Univ. Bourgogne Franche-Comte, OSU THETA, Observatorie de Besancon, BP 1615, F-25010 Besancon Cedex, France
11Instituto de Astronomía y Ciencias Planetarias, Universidad de Atacama, Copayapu 485, Copiapo, Chile
12Instituto de Física y Astronomía, Universidad de Valparaíso, Valparaíso, Chile
13Astronomy Research Unit, PO Box 3000, FL-90014 University of Oulu, Oulu, Finland
14Turitea Observatory, Palmerston North, New Zealand
Format: article
Version: published version
Access: open
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Language: English
Published: Oxford University Press, 2019
Publish Date: 2019-09-05


OGLE-LMC-DPV-065 is an interacting binary whose double-hump long photometric cycle remains hitherto unexplained. We analyze photometric time series available in archive data sets spanning 124 yr and present the analysis of new high-resolution spectra. A refined orbital period is found of 10d.031 6267 ± 0d.000 0056 without any evidence of variability. In spite of this constancy, small but significant changes in timings of the secondary eclipse are detected. We show that the long period continuously decreases from 350 to 218 d during 13 yr, then remains almost constant for about 10 yr. Our study of radial velocities indicates a circular orbit for the binary and yields a mass ratio of 0.203 ± 0.001. From the analysis of the orbital light curve, we find that the system contains 13.8 and 2.81 M stars of radii 8.8 and 12.6 R⊙ and absolute bolometric magnitudes −6.4 and −3.0, respectively. The orbit semimajor axis is 49.9 R and the stellar temperatures are 25 460 K and 9825 K. We find evidence for an optically and geometrically thick disc around the hotter star. According to our model, the disc has a radius of 25 R, central and outer vertical thickness of 1.6 R and 3.5 R, and temperature of 9380 K at its outer edge. Two shock regions located at roughly opposite parts of the outer disc rim can explain the light-curve asymmetries. The system is a member of the double periodic variables and its relatively high-mass and long photometric cycle make it similar in some aspects to β Lyrae.

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Series: Monthly notices of the Royal Astronomical Society
ISSN: 0035-8711
ISSN-E: 1365-8711
ISSN-L: 0035-8711
Volume: 487
Issue: 3
Pages: 4169 - 4180
DOI: 10.1093/mnras/stz1355
Type of Publication: A1 Journal article – refereed
Field of Science: 115 Astronomy and space science
Funding: R.E.M. gratefully acknowledges support by VRID-Enlace 218.016.004-1.0, FONDECYT 1190621, and the Chilean Centro de Excelencia en Astrofísica y Tecnologías Afines (CATA) BASAL grant AFB-170002. The OGLE project has received funding from the Polish National Science Centre grant MAESTRO no. 2014/14/A/ST9/00121. G. D. gratefully acknowledges the financial support of the Ministry of Education and Science of the Republic of Serbia through the project 176004, Stellar physics. J.G.F.-T. is supported by FONDECYT N. 3180210. N.A-D. acknowledges support from FONDECYT #3180063.
Copyright information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society. © 2019 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.