Searching for magnetic fields in pulsating A-type stars: the discovery of a strong field in the probable δ Sct star HD 340577 and a null result for the γ Dor star HR 8799.
In: Monthly Notices of the Royal Astronomical Society: Letters, Jg. 526 (2023-11-01), Heft 1, S. L83- (5S.)
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Zugriff:
Numerous δ Sct and γ Dor pulsators are identified in the region of the Hertzsprung–Russell diagram that is occupied by chemically peculiar magnetic Ap stars. The connection between δ Sct and γ Dor pulsations and the magnetic field in Ap stars is however not clear: theory suggests for magnetic Ap stars some critical field strengths for pulsation mode suppression by computing the magnetic damping effect for selected p and g modes. To test these theoretical considerations, we obtained PEPSI spectropolarimetric snapshots of the typical Ap star HD 340577, for which δ Sct-like pulsations were recently detected in Transiting Exoplanet Survey Satellite data, and the γ Dor pulsator HR 8799, which is a remarkable system with multiple planets and two debris discs. Our measurements reveal the presence of a magnetic field with a strength of several hundred Gauss in HD 340577. The measured mean longitudinal field would be the strongest field measured so far in a δ Sct star if the pulsational character of HD 340577 is confirmed spectroscopically. No magnetic field is detected in HR 8799. [ABSTRACT FROM AUTHOR]
Titel: |
Searching for magnetic fields in pulsating A-type stars: the discovery of a strong field in the probable δ Sct star HD 340577 and a null result for the γ Dor star HR 8799.
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Autor/in / Beteiligte Person: | Hubrig, S ; Järvinen, S P ; Alvarado-Gómez, J D ; Ilyin, I ; Schöller, M |
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Zeitschrift: | Monthly Notices of the Royal Astronomical Society: Letters, Jg. 526 (2023-11-01), Heft 1, S. L83- (5S.) |
Veröffentlichung: | 2023 |
Medientyp: | academicJournal |
ISSN: | 1745-3925 (print) |
DOI: | 10.1093/mnrasl/slad116 |
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