A quintuple star system containing two eclipsing binaries

Rappaport, S. and Lehmann, H. and Kalomeni, B. and Borkovits, T. and Latham, D. and Bieryla, A. and Ngo, H. and Mawet, D. and Howell, S. and Horch, E. and Jacobs, T.L. and LaCourse, D. and Sodor, A. and Vanderburg, A. and Pavlovski, Krešimir (2016) A quintuple star system containing two eclipsing binaries. Monthly Notices of the Royal Astronomical Society, 462 (2). pp. 1812-1825. ISSN 0035-8711

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We present a quintuple star system that contains two eclipsing binaries. The unusual architecture includes two stellar images separated by 11 arcsec on the sky: EPIC 212651213 and EPIC 212651234. The more easterly image (212651213) actually hosts both eclipsing binaries which are resolved within that image at 0.09 arcsec, while the westerly image (212651234) appears to be single in adaptive optics (AO), speckle imaging, and radial velocity (RV) studies. The ‘A’ binary is circular with a 5.1-d period, while the ‘B’ binary is eccentric with a 13.1-d period. The γ velocities of the A and B binaries are different by ∼10 km s−1. That, coupled with their resolved projected separation of 0.09 arcsec, indicates that the orbital period and separation of the ‘C’ binary (consisting of A orbiting B) are ≃65 yr and ≃25 au, respectively, under the simplifying assumption of a circular orbit. Motion within the C orbit should be discernible via future RV, AO, and speckle imaging studies within a couple of years. The C system (i.e. 212651213) has an RV and proper motion that differ from that of 212651234 by only ∼1.4 km s−1 and ∼3 mas yr−1. This set of similar space velocities in three dimensions strongly implies that these two objects are also physically bound, making this at least a quintuple star system.

Item Type: Article
Keywords: binary stars, close binaries, eclipsing binaries, spectroscopic binaries, visual binaries
Date: 2016
Subjects: NATURAL SCIENCES > Physics > Astronomy and Astrophysics
Additional Information: © 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2016 July 15. Received 2016 July 14; in original form 2016 May 20.
Divisions: Faculty of Science > Department of Physics
Project code: IP-2014-09-8656
Publisher: Oxford University Press
Depositing User: Krešimir Pavlovski
Date Deposited: 02 Nov 2017 15:24
Last Modified: 02 Nov 2017 15:24
URI: http://digre.pmf.unizg.hr/id/eprint/5655

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