DOI | Resolve DOI: https://doi.org/10.1111/j.1365-2966.2011.18765.x |
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Author | Search for: De Rosa, R. J.; Search for: Bulger, J.; Search for: Patience, J.; Search for: Leland, B.; Search for: Macintosh, B.; Search for: Schneider, A.; Search for: Song, I.; Search for: Marois, C.1; Search for: Graham, J. R.; Search for: Bessell, M.; Search for: Doyon, R. |
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Affiliation | - National Research Council of Canada. NRC Herzberg Institute of Astrophysics
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Format | Text, Article |
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ISSN | 0035-8711 |
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Subject | techniques: high angular resolution; binaries: general; stars: early-type; stars: imaging; X-rays: stars |
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Abstract | 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 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. |
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Publication date | 2011-07 |
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In | |
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Language | English |
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Peer reviewed | Yes |
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NPARC number | 19734694 |
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Export citation | Export as RIS |
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Report a correction | Report a correction (opens in a new tab) |
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Record identifier | f1a0d295-4f78-46a6-ab2b-19731a00d418 |
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Record created | 2012-03-28 |
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Record modified | 2020-04-21 |
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