Magnetism of the He-weak star HR2949
Th. Rivinius, G. Wade, R.H.D. Townsend, M. Shultz, J. Grunhut, O., Stahl, and the MiMeS Collaboration
TL;DR
This paper reports the detection of a magnetic field and rotational variability in the He-weak star HR2949, revealing complex surface abundance patterns and phase-lagged magnetic and spectral variations.
Contribution
It provides the first detailed analysis of magnetic field variability and surface abundance patterns in the He-weak star HR2949.
Findings
Magnetic field varies non-sinusoidally with phase.
Surface abundance patterns are complex and detectable in hydrogen lines.
Magnetic and spectral variations show a phase lag.
Abstract
A magnetic field and rotational line profile variability (lpv) is found in the He-weak star HR2949. The field measured from metallic lines varies in a clearly non-sinusoidal way, and shows a phase lag relative to the morphologically similar HeI equivalent width variations. The surface abundance patterns are strong and complex, and visible even in the hydrogen lines.
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