The Library
Discovery and analysis of three magnetic hot subdwarf stars : evidence for merger-induced magnetic fields
Tools
Tools
Tools
Pelisoli, Ingrid, Dorsch, M., Heber, U., Gaensicke, B. T., Geier, S., Kupfer, T., Németh, P., Scaringi, S. and Schaffenroth, V. (2022) Discovery and analysis of three magnetic hot subdwarf stars : evidence for merger-induced magnetic fields. Monthly Notices of the Royal Astronomical Society, 515 (2). pp. 2496-2510. doi:10.1093/mnras/stac1069 ISSN 1365-2966.
|
PDF
WRAP-Discovery-analysis-three-magnetic-hot-subdwarf-stars-22.pdf - Unspecified Version - Requires a PDF viewer. Download (1978Kb) | Preview |
Official URL: https://doi.org/10.1093/mnras/stac1069
Abstract
Magnetic fields can play an important role in stellar evolution. Among white dwarfs, the most common stellar remnant, the fraction of magnetic systems is more than 20 per cent. The origin of magnetic fields in white dwarfs, which show strengths ranging from 40 kG to hundreds of MG, is still a topic of debate. In contrast, only one magnetic hot subdwarf star has been identified out of thousands of known systems. Hot subdwarfs are formed from binary interaction, a process often associated with the generation of magnetic fields, and will evolve to become white dwarfs, which makes the lack of detected magnetic hot subdwarfs a puzzling phenomenon. Here we report the discovery of three new magnetic hot subdwarfs with field strengths in the range 300–500 kG. Like the only previously known system, they are all helium-rich O-type stars (He-sdOs). We analysed multiple archival spectra of the three systems and derived their stellar properties. We find that they all lack radial velocity variability, suggesting formation via a merger channel. However, we derive higher than typical hydrogen abundances for their spectral type, which are in disagreement with current model predictions. Our findings suggest a lower limit to the magnetic fraction of hot subdwarfs of $0.147^{+0.143}_{-0.047}$ per cent, and provide evidence for merger-induced magnetic fields which could explain white dwarfs with field strengths of 50 − 150 MG, assuming magnetic flux conservation.
| Item Type: | Journal Article | |||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Subjects: | Q Science > QB Astronomy | |||||||||||||||||||||||||||||||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | |||||||||||||||||||||||||||||||||
| SWORD Depositor: | Library Publications Router | |||||||||||||||||||||||||||||||||
| Library of Congress Subject Headings (LCSH): | Dwarf stars, Stars -- Magnetic fields, Astrophysics | |||||||||||||||||||||||||||||||||
| Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | |||||||||||||||||||||||||||||||||
| Publisher: | Oxford University Press (OUP) | |||||||||||||||||||||||||||||||||
| ISSN: | 1365-2966 | |||||||||||||||||||||||||||||||||
| Official Date: | September 2022 | |||||||||||||||||||||||||||||||||
| Dates: |
|
|||||||||||||||||||||||||||||||||
| Volume: | 515 | |||||||||||||||||||||||||||||||||
| Number: | 2 | |||||||||||||||||||||||||||||||||
| Page Range: | pp. 2496-2510 | |||||||||||||||||||||||||||||||||
| DOI: | 10.1093/mnras/stac1069 | |||||||||||||||||||||||||||||||||
| Status: | Peer Reviewed | |||||||||||||||||||||||||||||||||
| Publication Status: | Published | |||||||||||||||||||||||||||||||||
| Reuse Statement (publisher, data, author rights): | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2022 Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. | |||||||||||||||||||||||||||||||||
| Access rights to Published version: | Open Access (Creative Commons) | |||||||||||||||||||||||||||||||||
| Copyright Holders: | © 2022 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society | |||||||||||||||||||||||||||||||||
| RIOXX Funder/Project Grant: |
|
|||||||||||||||||||||||||||||||||
| Related URLs: |
Request changes or add full text files to a record
Repository staff actions (login required)
 |
View Item |
