Highlights from the SALT survey of hydrogen-deficient hot subdwarfs.

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• Dr. Simon Jeffery (Armagh Observatory)
• Thursday 25 January 2024, 16:00-17:00
• Hoyle Lecture Theatre, Institute of Astronomy.

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Hot subdwarfs are variously associated with the extreme horizontal branch and helium main-sequence, as well as other low-mass stars evolving to become white dwarfs. About 10% have partially or extremely helium-rich surfaces, with highly heterogeneous properties. Using the Southern African Large Telescope, a spectroscopic survey was begun to search for and analyse new members of various subclasses. With over 500 stars observed to date, we have discovered extreme helium stars, heavy-metal subdwarfs, super-hot pre-white dwarfs, a planetary nebula, a compact binary, and magnetic subdwarfs.

This talk is part of the Institute of Astronomy Colloquia series.

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