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http://hdl.handle.net/2289/8258Full metadata record
| DC Field | Value | Language |
|---|---|---|
| dc.contributor.author | Kurtz, D.W. | - |
| dc.contributor.author | Saio, H | - |
| dc.contributor.author | Holdsworth, D.L. | - |
| dc.contributor.author | Joshi, S | - |
| dc.contributor.author | Seetha, S | - |
| dc.date.accessioned | 2024-05-13T08:45:12Z | - |
| dc.date.available | 2024-05-13T08:45:12Z | - |
| dc.date.issued | 2024-02-09 | - |
| dc.identifier.citation | Monthly Notices of the Royal Astronomical Society, Vol. 529, p556 | en_US |
| dc.identifier.uri | http://hdl.handle.net/2289/8258 | - |
| dc.description | Open Access | en_US |
| dc.description.abstract | HD 12098 is a rapidly oscillating Ap star pulsating in the most distorted dipole mode yet observed in this class of star. Using Transiting Exoplanet Survey Satellite (TESS) Sector 58 observations, we show that there are photometric spots at both the magnetic poles of this star. It pulsates obliquely primarily in a strongly distorted dipole mode with a period of Ppuls = 7.85 min (νpuls = 183.34905 d−1; 2.12210 mHz) that gives rise to an unusual quadruplet in the amplitude spectrum. Our magnetic pulsation model cannot account for the strong distortion of the pulsation in one hemisphere, although it is successful in the other hemisphere. There are high-overtone p modes with frequencies separated by more than the large separation, a challenging problem in mode selection. The mode frequencies observed in the TESS data are in the same frequency range as those previously observed in ground-based Johnson B data, but are not for the same modes. Hence the star has either changed modes, or observations at different atmospheric depth detect different modes. There is also a low-overtone p mode and possibly g modes that are not expected theoretically with the >1 kG magnetic field observed in this star. | en_US |
| dc.language.iso | en | en_US |
| dc.publisher | Oxford University Press for the Royal Astronomical Society | en_US |
| dc.relation.uri | https://ui.adsabs.harvard.edu/abs/2024MNRAS.529..556K/abstract | en_US |
| dc.relation.uri | https://arxiv.org/abs/2402.06314 | en_US |
| dc.relation.uri | https://doi.org/10.1093/mnras/stae431 | en_US |
| dc.rights | 2024 The Author(s) | en_US |
| dc.title | HD 12098: a highly distorted dipole mode in an obliquely pulsating roAp star | en_US |
| dc.type | Article | en_US |
| Appears in Collections: | Research Papers (A&A) | |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| 2024_MNRAS_V529_p556.pdf Restricted Access | Open Access | 1.58 MB | Adobe PDF | View/Open Request a copy |
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