SIMBAD references

2011MNRAS.415..854D - Mon. Not. R. Astron. Soc., 415, 854-866 (2011/July-3)

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

DE ROSA R.J., BULGER J., PATIENCE J., LELAND B., MACINTOSH B., SCHNEIDER A., SONG I., MAROIS C., GRAHAM J.R., BESSELL M. and DOYON R.

Abstract (from CDS):

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.

Abstract Copyright: 2011 The Authors Monthly Notices of the Royal Astronomical Society2011 RAS

Journal keyword(s): techniques: high angular resolution - binaries: general - stars: early-type - stars: imaging - X-rays: stars

Simbad objects: 165

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2023.02.04-06:42:39

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