2020A&A...641A..91M


C.D.S. - SIMBAD4 rel 1.7 - 2020.12.05CET00:37:11

2020A&A...641A..91M - Astronomy and Astrophysics, volume 641A, 91-91 (2020/9-1)

Long photometric cycle and disk evolution in the β Lyrae-type binary OGLE-BLG-ECL-157529.

MENNICKENT R.E., GARCES J., DJURASEVIC G., IWANEK P., SCHLEICHER D., POLESKI R. and SOSZYNSKI I.

Abstract (from CDS):


Context. 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.
Aims. 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 the relative depth of primary and secondary eclipses.
Methods. We analyzed I and V-band OGLE photometric times series spanning 18.5 years and modeled the orbital light curve.
Results. We find that OGLE-BLG-ECL-157529 is a new eclipsing Galactic DPV of orbital period 24.8d, and that its long cycle length decreases in amplitude and length during the time baseline. We show that the changes in the orbital light curve can be reproduced considering an accretion disk of variable thickness and radius that surrounds the hottest stellar component. Our models indicate changes in the temperatures of the hot spot and the 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.

Abstract Copyright: © ESO 2020

Journal keyword(s): binaries: close - binaries: eclipsing - stars: variables: general - accretion, accretion disks

Simbad objects: 7

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Number of rows : 7

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 OGLE LMC-SC8 125836 EB* 05 15 53.21 -69 25 57.9   15.74 15.414 15.71 15.374 ~ 22 0
2 SV* HV 936 EB* 05 20 03.9485446147 -69 36 39.062393141     14.800 14.81 14.717 ~ 9 0
3 OGLE LMC-DPV-97 EB* 05 34 18.09 -70 38 08.8     16.069   16.086 ~ 5 0
4 V* V393 Sco Al* 17 48 47.6025530213 -35 03 25.628506169   7.71 7.59     B3III 58 0
5 OGLE BLG-ECL-157529 EB* 17 53 08.33 -32 46 27.0     14.829   13.035 ~ 2 0
6 * bet Lyr EB* 18 50 04.7952472 +33 21 45.609978 2.85 3.42 3.42 3.31 3.29 B8.5Ib-II 890 0
7 NAME Galactic Bulge reg ~ ~           ~ 3493 0

    Equat.    Gal    SGal    Ecl

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2020.12.05-00:37:11

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