Weighing Melnick 34: the most massive binary system known

Weighing Melnick 34: the most massive binary system known
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称量 Melnick 34:已知最大的双星系统

DOI:
10.1093/mnras/stz147
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发表时间:
2019
影响因子:
4.8
通讯作者:
Tehrani K
Tehrani K
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Tehrani K

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在这里,我们确认Melnick 34,一个X射线明亮的星星在30 Dor地区的大麦哲伦星云,作为一个SB 2的二进制包括WN 5 h + WN 5 h组件。我们目前的轨道解决方案,使用26个历元的VLT/UVES光谱和22个历元的档案双子座/GMOS光谱。径向速度监测和自动模板拟合方法都揭示了一个类似的高偏心率系统,质量比接近1,轨道周期与Pollock等人先前推导的155.1 ± 1 d X射线光变曲线周期一致。我们所支持的解导出了0.68 ± 0.02的偏心率和0.92 ± 0.07的质量比,给出了MAsin 3(i)= 65 ± 7 M <$和MBsin 3(i)= 60 ± 7 M <$的最小质量。利用WN 5 h模板和cmfgen进行的光谱建模显示,每个组分的温度为T = 53 kK,光度log(LA/L)= 6.43 ± 0.08和log(LB/L)= 6.37 ± 0.08,由此BONSAI演化模型给出MA= 139 M和MB= 127 M,年龄为10.6百万年。如果Mk 34的倾角为i <$50 °,光谱质量和动力学质量会一致,这使得Mk 34成为已知质量最大的双星,也是研究碰撞风双星性质的绝佳候选者。在200万到300万年内,Mk 34的两个组成部分都将演化成恒星质量的黑洞,假设双星系统幸存下来,这将使Mk 34成为一个潜在的双星黑洞合并祖先和引力波源。
Here, we confirm Melnick 34, an X-ray bright star in the 30 Dor region of the Large Magellanic Cloud, as an SB2 binary comprising WN5h + WN5h components. We present orbital solutions using 26 epochs of VLT/UVES spectra and 22 epochs of archival Gemini/GMOS spectra. Radial velocity monitoring and automated template-fitting methods both reveal a similar high-eccentricity system with a mass ratio close to unity, and an orbital period in agreement with the 155.1 ± 1 d X-ray light-curve period previously derived by Pollock et al. Our favoured solution derived an eccentricity of 0.68 ± 0.02 and mass ratio of 0.92 ± 0.07, giving minimum masses of MAsin3(i)  = 65 ± 7 M⊙and MBsin3(i)  = 60 ± 7 M⊙. Spectral modelling using WN5h templates withcmfgenreveals temperatures of T ∼ 53 kK for each component and luminosities of log(LA/L⊙)  = 6.43 ± 0.08 and log(LB/L⊙)  = 6.37 ± 0.08, from which BONNSAI evolutionary modelling gives masses of MA= 139M⊙and MB= 127M⊙and ages of ∼0.6 Myr. Spectroscopic and dynamic masses would agree if Mk34 has an inclination of i ∼ 50°, making Mk34 the most massive binary known and an excellent candidate for investigating the properties of colliding wind binaries. Within 2–3 Myr, both components of Mk34 are expected to evolve to stellar mass black holes, which, assuming the binary system survives, would make Mk34 a potential binary black hole merger progenitor and a gravitational wave source.
DOI: 10.1017/s1743921314004657
发表时间: 2012-08
期刊: Proceedings of the International Astronomical Union
影响因子: --
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发表时间: 2009
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