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

R. J. de Rosa; J. Bulger; J. Patience; B. Leland; B. Macintosh; A. Schneider; I. Song; C. Marois; J. R. Graham; M. Bessell; R. Doyon

doi:10.1111/j.1365-2966.2011.18765.x

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

R. J. de Rosa^*, J. Bulger, J. Patience, B. Leland, B. Macintosh, A. Schneider, I. Song, C. Marois, J. R. Graham, M. Bessell, R. Doyon

^*Corresponding author for this work

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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⁺⁴_-3 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.

Original language	English
Pages (from-to)	854-866
Number of pages	13
Journal	Monthly Notices of the Royal Astronomical Society
Volume	415
Issue number	1
DOIs	https://doi.org/10.1111/j.1365-2966.2011.18765.x
Publication status	Published - Jul 2011

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de Rosa, R. J., Bulger, J., Patience, J., Leland, B., Macintosh, B., Schneider, A., Song, I., Marois, C., Graham, J. R., Bessell, M., & Doyon, R. (2011). The Volume-limited A-Star (VAST) survey - I. Companions and the unexpected X-ray detection of B6-A7 stars. Monthly Notices of the Royal Astronomical Society, 415(1), 854-866. https://doi.org/10.1111/j.1365-2966.2011.18765.x

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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+4-3 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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de Rosa, RJ, Bulger, J, Patience, J, Leland, B, Macintosh, B, Schneider, A, Song, I, Marois, C, Graham, JR, Bessell, M & Doyon, R 2011, 'The Volume-limited A-Star (VAST) survey - I. Companions and the unexpected X-ray detection of B6-A7 stars', Monthly Notices of the Royal Astronomical Society, vol. 415, no. 1, pp. 854-866. https://doi.org/10.1111/j.1365-2966.2011.18765.x

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AU - de Rosa, R. J.

AU - Bulger, J.

AU - Patience, J.

AU - Leland, B.

AU - Macintosh, B.

AU - Schneider, A.

AU - Song, I.

AU - Marois, C.

AU - Graham, J. R.

AU - Bessell, M.

AU - Doyon, R.

PY - 2011/7

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N2 - 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+4-3 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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The Volume-limited A-Star (VAST) survey - I. Companions and the unexpected X-ray detection of B6-A7 stars

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