Identifying Yellow Supergiant Binaries in the Magellanic Clouds
Anna O'Grady
Carnegie Mellon University

Binary evolution theory predicts that the Hertzsprung Gap - the areaof the Hertzsprung-Russell diagram occupied primarily by intermediatetemperature evolved stars - is home to multiple populations of binarysystems with varied evolutionary histories. Recent works have constrainedthe binary fraction of evolved populations of massive stars in localgalaxies such as red supergiants and Wolf-Rayet stars, but the binaryfraction of yellow supergiants (YSGs) in the Hertzsprung Gap remainsunconstrained. We have developed a method to distinguish single YSGs frombinary YSGs using optical and ultraviolet photometry, and have appliedthis method to identify the first population of candidate YSG binaries inthe Magellanic Clouds, finding a preliminary binary fraction of 30-60%. Inthis talk I'll explain how we developed this method, present the resultsof our initial search for YSG binaries, show preliminary spectroscopicresults, and discuss plans to characterize the properties of these systems,constrain the binary fraction of YSGs in the Clouds, and identify whatfraction of the binary population have partially stripped envelopes.

Date:	Mardi, le 23 septembre 2025
Heure:	15:30
Lieu:	Université McGill
	rnest Rutherford Physics, R.E. Bell Conference Room (room 103)