De Rosa, R. J; Bulger, J; Patience, J; Leland, B; Macintosh, B A; Schneider, A; Song, I; Marois, C; Graham, J; Bessell, Michael; Doyon, R
With an adaptive optics imaging survey of 148 B6-A7 stars, we have tested the hypothesis that unresolved lower mass companions are the source of the unexpected X-ray detections of stars in this spectral type range. The sample is composed of 63 stars detected in X-rays within the ROSAT All Sky Survey and 85 stars that form a control sample; both subsets have the same restricted distribution of spectral type, age, X-ray sensitivity and separation coverage. A total of 68 companion candidates are...[Show more]
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