| Author(s): | O'Toole, S.J., Jordan, S., Friedrich, S., Heber, U. |
| Title: | Discovery of magnetic fields in hot subdwarfs |
| Source: | To appear in: White Dwarfs, eds. D. Koester, S. Moehler, ASP Conf. series |
| Year: | 2004 |
| Abstract: | We present initial results of a project to measure mean longitudinal magnetic fields in a group of sdB/OB/O stars. The project was inspired by the discovery of three super-metal-rich sdOB stars, each having metals (e.g. Ti, V) enhanced by factors of 103 to 105. Similar behaviour is observed in chemically peculiar A stars, where strong magnetic fields are responsible for the enrichment. With this in mind, we obtained circularly polarised spectra of two of the super-metal-rich sdOBs, two 'normal' sdBs and two sdOs using FORS1 on the ESO/VLT. By examining circular polarisation in the hydrogen Balmer lines and in helium lines, we have detected magnetic fields with strengths of 1-2 kG in most of our targets. This suggests that such fields are relatively common in hot subdwarfs. |
| Preprint issued: | |
| Remarks: |
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Letzte Änderung/Updated: 03.12.2004