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arXiv · 2102.01924

Eclipsing Binary Populations across the Northern Galactic Plane from the KISOGP survey

Fangzhou Ren·Richard de Grijs·Huawei Zhang·Licai Deng·Xiaodian Chen·Noriyuki Matsunaga·Chao Liu·Weijia Sun·Hiroyuki Maehara·Nobuharu Ukita·Naoto Kobayashi
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Abstract

We present a catalog of eclipsing binaries in the northern Galactic Plane from the Kiso Wide-Field Camera Intensive Survey of the Galactic Plane (KISOGP). We visually identified 7055 eclipsing binaries spread across $\sim$330 square degrees, including 4197 W Ursa Majoris/EW-, 1458 $β$ Lyrae/EB-, and 1400 Algol/EA-type eclipsing binaries. For all systems, $I$-band light curves were used to obtain accurate system parameters. We derived the distances and extinction values for the EW-type objects from their period--luminosity relation. We also obtained the structure of the thin disk from the distribution of our sample of eclipsing binary systems, combined with those of high-mass star-forming regions and Cepheid tracers. We found that the thin disk is inhomogeneous in number density as a function of Galactic longitude. Using this new set of distance tracers, we constrain the detailed structure of the thin disk. Finally, we report a global parallax zero-point offset of $ Δπ=-42.1\pm1.9\mbox{(stat.)}\pm12.9\mbox{(syst.)}$ $μ$as between our carefully calibrated EW-type eclipsing binary positions and those provided by Gaia Early Data Release 3. Implementation of the officially recommended parallax zero-point correction results in a significantly reduced offset. Additionally, we provide a photometric characterization of our EW-type eclipsing binaries that can be applied to further analyses.

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Fangzhou Ren, Richard de Grijs, Huawei Zhang, Licai Deng, Xiaodian Chen, Noriyuki Matsunaga, Chao Liu, Weijia Sun, Hiroyuki Maehara, Nobuharu Ukita, Naoto Kobayashi. 2021-02-03. Eclipsing Binary Populations across the Northern Galactic Plane from the KISOGP survey. https://doi.org/10.3847/1538-3881%2Fabe30e

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