The magnetic field and stellar wind of the mature late-F star χ Draconis A
Article
Marsden, S. C., Evensberget, D., Brown, E. L., Neiner, C., Seach, J. M., Morin, J., Petit, P., Jeffers, S. and Folsom, C. O.. 2023. "The magnetic field and stellar wind of the mature late-F star χ Draconis A." Monthly Notices of the Royal Astronomical Society. 522 (1), pp. 792-810. https://doi.org/10.1093/mnras/stad925
| Article Title | The magnetic field and stellar wind of the mature late-F star χ Draconis A |
|---|---|
| ERA Journal ID | 1074 |
| Article Category | Article |
| Authors | Marsden, S. C., Evensberget, D., Brown, E. L., Neiner, C., Seach, J. M., Morin, J., Petit, P., Jeffers, S. and Folsom, C. O. |
| Journal Title | Monthly Notices of the Royal Astronomical Society |
| Journal Citation | 522 (1), pp. 792-810 |
| Number of Pages | 19 |
| Year | 2023 |
| Publisher | Oxford University Press |
| Place of Publication | United Kingdom |
| ISSN | 0035-8711 |
| 1365-2966 | |
| Digital Object Identifier (DOI) | https://doi.org/10.1093/mnras/stad925 |
| Web Address (URL) | https://academic.oup.com/mnras/article/522/1/792/7093409 |
| Abstract | F stars lie in the transition region between cool stars with dynamo generated fields and hot star fossil fields and offer an interesting window into the generation of magnetic fields in shallow convection zones. In this paper, we investigate the magnetic field of the mature F7V primary of the bright χ Draconis system. χ Dra was observed in circularly polarized light at four epochs from 2014 through to 2019 using the NARVAL spectropolarimeter at the Téléscope Bernard Lyot. Using the technique of least-squares deconvolution, we created high signal-to-noise line profiles from which we were able to measure the radial velocity of both the primary and secondary and use these to improve the orbital parameters of the system. Additionally, we used the technique of Zeeman Doppler imaging to reconstruct the large-scale magnetic field geometry of the primary at the four epochs. The magnetic maps show that χ Dra A has a predominately dipolar poloidal magnetic field at all epochs with the magnetic axis well aligned with the stellar rotation axis. The large-scale features of the magnetic field appear to be relatively stable over the ∼5 yr time base of our observations, with no evidence of any polarity reversals. We used the magnetic field maps to model the wind from χ Dra A at all epochs, showing that the mass-loss from the stellar wind of χ Dra A is 3–6 times the current solar value, while the angular momentum loss from the wind is around 3–4 times the solar value. |
| Keywords | stars: activity; binaries: spectroscopic; stars: individual: (χ Dra); stars: magnetic fields |
| ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
| Byline Affiliations | Centre for Astrophysics |
| Leiden University, Netherlands | |
| Paris Sciences and Letters University, France | |
| University of Montpellier, France | |
| University of Toulouse, France | |
| Max Planck Institute for Solar System Research, Germany | |
| University of Tartu, Estonia | |
| University of Western Ontario, Canada |
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https://research.usq.edu.au/item/z296w/the-magnetic-field-and-stellar-wind-of-the-mature-late-f-star-draconis-a
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