Other
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008mnras.386.1750k&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 386, Issue 3, pp. 1750-1755.
Other
3
Binaries: Visual, Stars: Chemically Peculiar, Stars: Individual: Hd218994, Stars: Magnetic Fields, Stars: Variables: Other
Scientific paper
We have discovered that at least one component of the visual binary star HD218994AB is a δSct star. The primary star of this system is a known rapidly oscillating Ap (roAp) star; therefore, it is possible that it is both an roAp star and a δSct star - a hybrid. There are no confirmed such hybrid roAp-δSct stars, and they are predicted theoretically not to exist. More probably, HD218994B is the δSct star, as it is 0.54mag fainter than the primary and also lies in the δSct instability strip. It then offers the potential to determine Teff and L for the primary which appears to be one of the more evolved roAp stars and an important test the theoretically calculated roAp star instability strip. In this case, the system also is important since the stars are a co-eval pair of very similar mass, yet one is a magnetic roAp star and the other is probably a non-magnetic δSct star with a normal spectrum. We detect a significant longitudinal magnetic field strength of 440 +/- 23G in the roAp star HD218994A. We also present the first measurement of the longitudinal magnetic field strength for the δSct star HD21190, the most-evolved Ap star known. We obtain a formally significant value of 47 +/- 13G. If confirmed, this will make HD21190 the first magnetic δSct star known.
Based on observations collected at the European Southern Observatory, Paranal, Chile, as part of programme 079.D-0241.
E-mail: dwkurtz@uclan.ac.uk
González Javier Francisco
Hubrig Svetlana
Kurtz Don W.
Martinez Pablo
van Wyk Francois
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