OGLE-LMC-ECL-11893: the discovery of a long-period eclipsing binary with a circumstellar disk

Dong, Subo; Katz, Boaz; Prieto, Jose L.; Udalski, Andrzej; Kozlowski, Szymon; Street, R. A.; Bramich, D. M.; Tsapras, Y.; Hundertmark, M.; Snodgrass, C.; Horne, K.; Dominik, M. and Figuera Jaimes, R. (2014). OGLE-LMC-ECL-11893: the discovery of a long-period eclipsing binary with a circumstellar disk. Astrophysical Journal, 788(1), article no. 41.

DOI: https://doi.org/10.1088/0004-637X/788/1/41

Abstract

We report the serendipitous discovery of a disk-eclipse system OGLE-LMC-ECL-11893. The eclipse occurs with a period of 468 days, a duration of about 15 days, and a deep (up to Δm_I ≈ 1.5), peculiar, and asymmetric profile. A possible origin of such an eclipse profile involves a circumstellar disk. The presence of the disk is confirmed by the H-α line profile from the follow-up spectroscopic observations, and the star is identified as Be/Ae type. Unlike the previously known disk-eclipse candidates, the eclipses of OGLE-LMC-ECL-11893 retain the same shape throughout the span of ~17 yr (13 orbital periods), indicating no measurable orbital precession of the disk.

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