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We report the serendipitous observations of 571 luminous supergiants in theMagellanic Clouds by the spectroscopic GALAH and TESS-HERMES surveys: 434 starsin the Large Magellanic Cloud and 137 in the Small Magellanic Cloud. We alsofind one star that appears associated with structured star formation in theMagellanic Bridge. Both of these surveys are aimed at the local volume of theGalaxy but have simple, magnitude-limited selection functions that mean theyinclude some observations of luminous extra-Galactic stars. The surveysdetermine stellar parameter and abundances using The Cannon, a data-drivengenerative modelling approach. In this work, we explore the results from TheCannon when it is fed the spectra of these intrinsically luminous supergiantsin the Magellanic Clouds, which are well outside the normal bounds of TheCannon's training set. We find that, although the parameters areastrophysically incorrect, the $v\sin i$ and the abundances of lithium, barium,and magnesium are excellent discriminants of these stars. It shows that in thefuture, with an expanded training set, it should be possible to determineaccurate values for these types of stars.

The GALAH and TESS-HERMES surveys: high-resolution spectroscopy of luminous supergiants in the Magellanic Clouds and Bridge