تقرير
Multiplicity of disc-bearing stars in Upper Scorpius and Upper Centaurus-Lupus
| العنوان: | Multiplicity of disc-bearing stars in Upper Scorpius and Upper Centaurus-Lupus |
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| المؤلفون: | Kuruwita, Rajika L., Ireland, Michael, Rizzuto, Aaron, Bento, Joao, Federrath, Christoph |
| سنة النشر: | 2018 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Earth and Planetary Astrophysics, Astrophysics - Solar and Stellar Astrophysics |
| الوصف: | We present observations of disc-bearing stars in Upper Scorpius (US) and Upper Centaurus-Lupus (UCL) with moderate resolution spectroscopy in order to determine the influence of multiplicity on disc persistence after ~5-20 Myr. Discs were identified using infra-red (IR) excess from the Wide-field Infra-red Survey Explorer (WISE) survey. Our survey consists of 55 US members and 28 UCL members, using spatial and kinematic information to assign a probability of membership. Spectra are gathered from the ANU 2.3m telescope using the Wide Field Spectrograph (WiFeS) to detect radial velocity variations that indicate the presence of a companion. We identify 2 double-lined spectroscopic binaries, both of which have strong IR excess. We find the binary fraction of disc-bearing stars in US and UCL for periods up to 20 years to be $0.06^{0.07}_{0.02}$ and $0.13^{0.06}_{0.03}$ respectively. Based on the multiplicity of field stars, we obtain an expected binary fraction of $0.12^{0.02}_{0.01}$. The determined binary fractions for disc-bearing stars does not vary significantly from the field, suggesting that the overall lifetime of discs may not differ between single and binary star systems. Comment: 16 pages, 8 figures, 6 tables, Accepted to MNRAS |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1093/mnras/sty2108 |
| الوصول الحر: | http://arxiv.org/abs/1808.00620Test |
| رقم الانضمام: | edsarx.1808.00620 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1093/mnras/sty2108 |
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