The volume-limited A-Star (VAST) survey - I. Companions and the unexpected X-ray detection of B6-A7 stars

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DOIResolve DOI: http://doi.org/10.1111/j.1365-2966.2011.18765.x
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TypeArticle
Journal titleMonthly Notices of the Royal Astronomical Society
ISSN0035-8711
Volume415
Issue1
Pages854866; # of pages: 13
Subjecttechniques: high angular resolution; binaries: general; stars: early-type; stars: imaging; X-rays: stars
AbstractWith 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 resolved with separations ranging from 0.3 to 26.2 arcsec, with 23 new detections. The multiple star frequency of the X-ray sample based on companions resolved within the ROSAT error ellipse is found to be 43(-6)(+6) per cent. The corresponding control sample multiple star frequency is three times lower at 12(-3)(+4) per cent - a difference of 31 +/- 7 per cent. These results are presented in the first of a series of papers based on our Volume-limited A-Star (VAST) survey - a comprehensive study of the multiplicity of A-type stars.
Publication date
PublisherJohn Wiley and Sons
LanguageEnglish
AffiliationNRC Herzberg Institute of Astrophysics; National Research Council Canada
Peer reviewedYes
NPARC number19734694
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Record identifierf1a0d295-4f78-46a6-ab2b-19731a00d418
Record created2012-03-28
Record modified2016-05-09
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