The SALT survey of helium-rich hot subdwarfs: final sample and classification
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866909956992663552 |
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| author | Jeffery, C. Simon Dorsch, Matti Monai, Asish Philip Snowdon, Edward J. Monageng, Itumaleng Miszalski, Brent |
| author_facet | Jeffery, C. Simon Dorsch, Matti Monai, Asish Philip Snowdon, Edward J. Monageng, Itumaleng Miszalski, Brent |
| contents | A medium-resolution spectroscopic survey of helium-rich hot subdwarfs has been carried out using the Southern African Large Telescope (SALT). Objectives include the discovery of exotic hot subdwarfs, resolving distinct subclasses, identifying evolutionary sequences, and establishing the past and future histories of many of these unusual stars. This paper extends the sample described by Jeffery et al. (2021) (arXiv:2011.09523) from 100 to 697 stars. It describes the selection criteria and presents spectral classifications based on the MK-like Drilling system. The sample includes 283 extremely helium-rich hot subdwarfs, 17 extreme helium stars, 110 intermediate helium-rich hot subdwarfs, as well as 21 helium-rich stars of other types. It now represents the largest homogeneous sample of both "normal" He-sdOs and "luminous" or "hot" He-sdOs. Interesting stars discovered include magnetic hot subdwarfs, extremely hot pre-white dwarfs and hot subdwarfs, including hot subdwarfs showing NV emission, one short-period binary, new extreme helium stars and several double-subdwarf candidates. The data form the basis for kinematic and model atmosphere analyses to follow. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2512_10529 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | The SALT survey of helium-rich hot subdwarfs: final sample and classification Jeffery, C. Simon Dorsch, Matti Monai, Asish Philip Snowdon, Edward J. Monageng, Itumaleng Miszalski, Brent Solar and Stellar Astrophysics A medium-resolution spectroscopic survey of helium-rich hot subdwarfs has been carried out using the Southern African Large Telescope (SALT). Objectives include the discovery of exotic hot subdwarfs, resolving distinct subclasses, identifying evolutionary sequences, and establishing the past and future histories of many of these unusual stars. This paper extends the sample described by Jeffery et al. (2021) (arXiv:2011.09523) from 100 to 697 stars. It describes the selection criteria and presents spectral classifications based on the MK-like Drilling system. The sample includes 283 extremely helium-rich hot subdwarfs, 17 extreme helium stars, 110 intermediate helium-rich hot subdwarfs, as well as 21 helium-rich stars of other types. It now represents the largest homogeneous sample of both "normal" He-sdOs and "luminous" or "hot" He-sdOs. Interesting stars discovered include magnetic hot subdwarfs, extremely hot pre-white dwarfs and hot subdwarfs, including hot subdwarfs showing NV emission, one short-period binary, new extreme helium stars and several double-subdwarf candidates. The data form the basis for kinematic and model atmosphere analyses to follow. |
| title | The SALT survey of helium-rich hot subdwarfs: final sample and classification |
| topic | Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2512.10529 |