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Paper: Multiplicity of Rapidly Oscillating Ap Stars
Volume: 462, Progress in Solar/Stellar Physics with Helio- and Asteroseismology
Page: 91
Authors: Schöller, M.; Correia, S.; Hubrig, S.; Kurtz, D. W.
Abstract: Rapidly oscillating Ap (roAp) stars have rarely been found in binary or higher order multiple systems. We intend to study the multiplicity of this type of chemically peculiar star, looking for visual companions in the range of angular separation between 0.″05 and 8″. We carried out a survey of 28 roAp stars using diffraction-limited near-infrared imaging with NAOS-CONICA at the Very Large Telescope (VLT). Additionally, we observed three non-oscillating magnetic Ap stars. We detected a total of six companion candidates with low chance projection probabilities. Four of these are new detections, the other two are confirmations. An additional 39 companion candidates are very likely to be chance projections. We also found one binary system among the non-oscillating magnetic Ap stars. The detected companion candidates have K magnitudes between 6.″8 and 19.″5 and angular separations ranging from 0.″24 to 8.″9. corresponding to linear projected separations of 30–2000 AU. While our study confirms that roAp stars are indeed not very often members of binary or multiple systems, we have found four new companion candidates, which are likely to be physical companions.
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