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26 April 2024 |
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A rival for Babcock's star: the extreme 30-kG variable magnetic field in the Ap star HD 75049 | | V.G.Elkin
; G.Mathys
; D.W.Kurtz
; S. Hubrig
; L.M.Freyhammer
; | | Date: |
6 Aug 2009 | | Abstract: | The extraordinary magnetic Ap star HD75049 has been studied with data
obtained with the ESO VLT and 2.2-m telescopes. Direct measurements reveal that
magnetic field modulus at maximum reaches 30 kG. The star shows photometric,
spectral and magnetic variability with a rotation period of 4.049 d. Variations
of the mean longitudinal magnetic field can be described to first order by a
centred dipole model with an inclination i = 20 degree, an obliquity beta = 66
degrees and a polar field B_p = 50 kG. However, the character of the variations
in the field modulus suggests that the field structure is more complex than a
centred dipole model, which cannot fit simultaneously the variations of the
magnetic field modulus and the longitudinal magnetic field. HD75049 displays
overabundances of Si, Ti, Cr, Fe and rare earth elements, indicating that it
belongs to the Ap SiCr class of peculiar stars. This star has the second
strongest magnetic field of any main sequence star after Babcock’s star,
HD215441, which it rivals. | | Source: | arXiv, 0908.0849 | | Services: | Forum | Review | PDF | Favorites | |
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