| DOI | Trouver le DOI : https://doi.org/10.1111/j.1365-2966.2011.18765.x |
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| Auteur | Rechercher : De Rosa, R. J.; Rechercher : Bulger, J.; Rechercher : Patience, J.; Rechercher : Leland, B.; Rechercher : Macintosh, B.; Rechercher : Schneider, A.; Rechercher : Song, I.; Rechercher : Marois, C.1; Rechercher : Graham, J. R.; Rechercher : Bessell, M.; Rechercher : Doyon, R. |
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| Affiliation | - Conseil national de recherches du Canada. Institut Herzberg d'astrophysique du CNRC
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| Format | Texte, Article |
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| ISSN | 0035-8711 |
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| Sujet | techniques: high angular resolution; binaries: general; stars: early-type; stars: imaging; X-rays: stars |
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| Résumé | 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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| Date de publication | 2011-07 |
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| Dans | |
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| Langue | anglais |
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| Publications évaluées par des pairs | Oui |
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| Numéro NPARC | 19734694 |
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| Exporter la notice | Exporter en format RIS |
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| Signaler une correction | Signaler une correction (s'ouvre dans un nouvel onglet) |
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| Identificateur de l’enregistrement | f1a0d295-4f78-46a6-ab2b-19731a00d418 |
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| Enregistrement créé | 2012-03-28 |
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| Enregistrement modifié | 2020-04-21 |
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