Masses and activity of AB Doradus B a/b - The age of the AB Dor quadruple system revisited

Masses and activity of AB Doradus B a/b - The age of the AB Dor quadruple system revisited
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AB Doradus B a/b 的质量和活动 - 重新审视 AB Dor 四重系统的年龄

DOI:
10.1051/0004-6361/201424137
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发表时间:
2014
影响因子:
6.5
通讯作者:
Fuhrmeister
Fuhrmeister
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Wolter;Czesla;Fuhrmeister

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本文报道了近距离双星AB Dor Ba/B(Rst 137 B)的多波长研究。我们的研究包括天体测量轨道测量,光谱学,X射线和无线电观测。利用2004 - 2009年VLT/纳科拍摄的AB Dor B的所有可用自适应光学图像,我们将其轨道周期严格限制为360.6 ± 1.5天。我们给出了Rst 137 B的第一轨道解,并估算了AB Dor Ba+B的合并质量为0.69+0.02- 0.24 M,略高于以前基于红外测光的估算。我们确定的Rst 137 B的轨道倾角接近从多普勒成像推断的AB D或A的轴倾角。我们的VLT/UVES光谱产生的高旋转速度≥30 km s-1的组件Ba和Bb,在雅阁与以前的测量,这对应的旋转周期显着短于一天。我们的组合光谱模型,使用PHOENIX光谱,产生的有效温度为3310 ± 50 K的主要和约60 K以下的次要。光谱可能覆盖了色球耀斑,并显示Rst 137 B的至少一个成分是非常活跃的。活动和弱的变化也发现在我们的waveousXMM-Newton观测,而我们的ATCA无线电数据产生恒定的流量在以前的测量水平。使用演化模型,我们新确定的恒星参数证实Rst 137 B的年龄在5000万年到10000万年之间。
We present a multiwavelength study of the close binary AB Dor Ba/b (Rst137B). Our study comprises astrometric orbit measurements, optical spectroscopy, X-ray and radio observations. Using all available adaptive optics images of AB Dor B taken with VLT/NACO from 2004 to 2009, we tightly constrain its orbital period to 360.6 ± 1.5 days. We present the first orbital solution of Rst 137B and estimate the combined mass of AB Dor Ba+b as 0.69+0.02-0.24M⊙, slightly exceeding previous estimates based on IR photometry. Our determined orbital inclination of Rst 137B is close to the axial inclination of AB Dor A inferred from Doppler imaging. Our VLT/UVES spectra yield high rotational velocities of ≥30 km s-1for both components Ba and Bb, in accord with previous measurements, which corresponds to rotation periods significantly shorter than one day. Our combined spectral model, using PHOENIX spectra, yields an effective temperature of 3310 ± 50 K for the primary and approximately 60 K less for the secondary. The optical spectra presumably cover a chromospheric flare and show that at least one component of Rst 137B is significantly active. Activity and weak variations are also found in our simultaneousXMM-Newtonobservations, while our ATCA radio data yield constant fluxes at the level of previous measurements. Using evolutionary models, our newly determined stellar parameters confirm that the age of Rst 137B is between 50 and 100 Myr.
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