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

Kavli Affiliate: Huawei Zhang

| First 5 Authors: Fangzhou Ren, Richard de Grijs, Huawei Zhang, Licai Deng, Xiaodian Chen

| Summary:

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 $beta$
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 $ Delta pi=-42.1pm1.9mbox{(stat.)}pm12.9mbox{(syst.)}$ $mu$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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