The mass ratio and formation mechanisms of Herbig Ae/Be star binary systems
| العنوان: | The mass ratio and formation mechanisms of Herbig Ae/Be star binary systems |
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| المؤلفون: | H. E. Wheelwright, Simon P. Goodwin, Rene D. Oudmaijer |
| المصدر: | Monthly Notices of the Royal Astronomical Society. 401:1199-1218 |
| بيانات النشر: | Oxford University Press (OUP), 2010. |
| سنة النشر: | 2010 |
| مصطلحات موضوعية: | Physics, Initial mass function, FOS: Physical sciences, Binary number, Astronomy and Astrophysics, Astrophysics, Mass ratio, Herbig Ae/Be star, Spectral line, Stars, Astrophysics - Solar and Stellar Astrophysics, Space and Planetary Science, Binary system, Halo, Solar and Stellar Astrophysics (astro-ph.SR) |
| الوصف: | We present B and R band spectroastrometry of a sample of 45 Herbig Ae/Be stars in order to study their binary properties. All but one of the targets known to be binary systems with a separation of ~0.1-2.0 arcsec are detected by a distinctive spectroastrometric signature. Some objects in the sample exhibit spectroastrometric features that do not appear attributable to a binary system. We find that these may be due to light reflected from dusty halos or material entrained in winds. We present 8 new binary detections and 4 detections of an unknown component in previously discovered binary systems. The data confirm previous reports that Herbig Ae/Be stars have a high binary fraction, 74+/-6 per cent in the sample presented here. We use a spectroastrometric deconvolution technique to separate the spatially unresolved binary spectra into the individual constituent spectra. The separated spectra allow us to ascertain the spectral type of the individual binary components, which in turn allows the mass ratio of these systems to be determined. In addition, we appraise the method used and the effects of contaminant sources of flux. We find that the distribution of system mass ratios is inconsistent with random pairing from the Initial Mass Function, and that this appears robust despite a detection bias. Instead, the mass ratio distribution is broadly consistent with the scenario of binary formation via disk fragmentation. Accepted for publication in MNRAS, minor changes made in proof stage |
| وصف الملف: | application/pdf |
| تدمد: | 1365-2966 0035-8711 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c9731e12dc5149cc5996c63ccf0655d7 https://doi.org/10.1111/j.1365-2966.2009.15708.x |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....c9731e12dc5149cc5996c63ccf0655d7 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 13652966 00358711 |
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