Two Be or Not Two Be: A New Companion Detection for HD 52244 Using HST/FGS*

Abstract In this paper we present a newly detected companion to the Be star, HD 52244 (B2IVnpe), using the Fine Guidance Sensors (FGS) on the Hubble Space Telescope (HST). In fall 2021, HST became momentarily unavailable to support nominal operations, and we used the operational FGS to carry out a multiplicity survey of six Be stars. We were able to resolve a companion to HD 52244, with a separation of 42.7 ± 1.1 mas (74 au) and a position angle of 144.2 ± 0.3 with a differential magnitude in the F583W filter of 1.91 ± 0.02 mag. This study presents the results of the newly detected companion of HD 52244 and lays the groundwork for future studies looking for wide or third companions to Be stars.