Other
Scientific paper
Oct 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006mnras.372..286k&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 372, Issue 1, pp. 286-292.
Other
33
Stars: Individual: Hd154708: Stars: Magnetic Fields: Stars: Oscillations: Stars: Variables: Other, Stars: Individual: Hd154708, Stars: Magnetic Fields, Stars: Oscillations, Stars: Variables: Other
Scientific paper
HD154708 has an extraordinarily strong magnetic field of 24.5kG. Using 2.5h of high time resolution Ultraviolet and Visual Echelle Spectrograph (UVES) spectra we have discovered this star to be an roAp star with a pulsation period of 8min. The radial velocity amplitudes in the rare earth element lines of NdII, NdIII and PrIII are unusually low - ~60ms-1 - for an roAp star. Some evidence suggests that roAp stars with stronger magnetic fields have lower pulsation amplitudes. Given the central role that the magnetic field plays in the oblique pulsator model of the roAp stars, an extensive study of the relation of magnetic field strength to pulsation amplitude is desirable.
Based on observations collected at the European Southern Observatory, Paranal, Chile, as part of programme 075.D-0145.
E-mail: dwkurtz@uclan.ac.uk
Cunha Margarida S.
Elkin V. G.
Hubrig Svetlana
Kurtz Don W.
Mathys Gautier
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