ASAS-SN Identification of FY Sct as a detached eclipsing binary system with a ~2.6 year period

TL;DR

This paper identifies FY Sct as a long-period detached eclipsing binary with a ~2.6-year orbit, exhibiting a disk-like eclipse profile and pulsations, based on combined ASAS-SN and ASAS data from 2000-2018.

Contribution

The study reveals FY Sct as a unique long-period eclipsing binary with a disk eclipse profile, expanding understanding of such systems.

Findings

Orbital period of ~2.57 years

Primary eclipse lasts ~73 days

Detection of ~78-day pulsations

Abstract

We report the identification of the bright (V${\sim}13.3$ mag) star FY Sct as a long period detached eclipsing binary using a combined ASAS-SN and ASAS light curve spanning 2000-2018. The orbital period is P${\sim}2.57$ years and the primary eclipse lasts ${\sim}73$ days. The eclipse profile is suggestive of a disk eclipsing binary rather than a stellar component. We also detect ${\sim}0.4$ mag pulsations with a period of P${\sim78}$ d. The next eclipse begins on September, 28, 2018. Further photometric and spectroscopic observations are encouraged, particularly when the system is in eclipse.