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A magnetic snapshot survey of F-type stars

Abstract : We present a spectropolarimetric magnetic snapshot survey of 55 stars which includes 53 F-type stars ranging from spectral types F0 to F9 plus 2 chemically peculiar stars β CrB, and δ Cap. We look for magnetic fields in stars spanning a range of effective temperatures where the transition from fossil to dynamo magnetic fields is believed to occur. High-resolution spectropolarimetry using circularly polarized spectra is used to look for a magnetic detection in the Stokes V profile, determine the mean longitudinal magnetic field (Bl), and to look for correlations with stellar parameters. Surface magnetic fields are detected on 14 F-stars, and present in every spectral class from F3V-F9V ranging in strength from 0.3 ± 0.1 G (36 UMa, F8V) to 8.3 ± 0.9 G (h Dra, F8V). Thus we find photospheric magnetic fields are present in stars as early as spectral type F3V with an outer convection zone thickness less than a few per cent of the stellar radius.
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Submitted on : Thursday, May 19, 2022 - 8:00:40 PM
Last modification on : Friday, August 5, 2022 - 12:00:55 PM

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J. M. Seach, S. C. Marsden, B. D. Carter, C. Neiner, C. P. Folsom, et al.. A magnetic snapshot survey of F-type stars. Monthly Notices of the Royal Astronomical Society, 2020, 494, pp.5682-5703. ⟨10.1093/mnras/staa1107⟩. ⟨insu-03673144⟩

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