OGLE-LMC-ECL-11893 : the discovery of a long-period eclipsing binary with a circumstellar disk
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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 ΔmI 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.
Dong , S , Katz , B , Prieto , J L , Udalski , A , Kozlowski , S , Street , R A , Bramich , D M , Tsapras , Y , Hundertmark , M , Snodgrass , C , Horne , K , Dominik , M & Figuera Jaimes , R J 2014 , ' OGLE-LMC-ECL-11893 : the discovery of a long-period eclipsing binary with a circumstellar disk ' Astrophysical Journal , vol 788 , no. 1 . DOI: 10.1088/0004-637X/788/1/41
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S.D. is supported by "the Strategic Priority Research Program-The Emergence of Cosmological Structures" of the Chinese Academy of Sciences (grant No. XDB09000000). The OGLE project has received funding from the European Research Council under the European Community's Seventh Framework Programme (FP7/20072013)/ERC grant agreement No. 246678 to A.U. M.D., R.F.J., K.H., R.A.S., C.S., and Y.T. are supported by NPRP grant NPRP-09-476-1-78 from the Qatar National Research Fund (a member of Qatar Foundation). D.M.B.'s contribution to this publication was made possible by NPRP grant # X-019-1-006 from the Qatar National Research Fund (a member of Qatar Foundation). C.S. has received funding from the European Union Seventh Framework Programme (FP7/2007-2013) under grant agreement No. 268421.
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