Probing the origin of UX Ori-type variability in the YSO binary CO Ori with VLTI/GRAVITY

Probing the origin of UX Ori-type variability in the YSO binary CO Ori with VLTI/GRAVITY
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利用 VLTI/GRAVITY 探测 YSO 二元 CO Ori 中 UX Ori 类型变异的起源

DOI:
10.1093/mnras/stx3150
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发表时间:
2018
影响因子:
4.8
通讯作者:
Davies C
Davies C
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Davies C

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在年轻的恒星物体二进制CO猎户座的主要星星显示UX猎户座型的变化:不规则的,高振幅的光学和近红外光度波动的通量最小值与偏振最大值相吻合。这归因于局部不透明度的变化。在CO Ori A中,这些变化表现出12.4年的周期。在这里,我们调查的物理起源的波动不透明度和它的周期性使用干涉观测的CO Ori使用VLTI/重力。首次实现了连续K带环一次辐射和环二次辐射的边缘空间分辨,并在二次辐射谱中检测到Brγ辐射。我们估计的光谱类型范围为CO Ori B的K2-K5假设视觉消光,AV= 2和430 pc的距离。根据连续光谱的几何模型,环一次辐射与一个中心点源加上一个高斯分量一致,其半峰全宽为2.31 ± 0.04 mas,倾斜30.2° ± 2.2°,主轴位置角为40° ± 6°。这个倾角低于其他UX Ori-type恒星的星盘,提供了第一个迹象,表明UX Ori-type现象可能是通过星盘外部的星周物质的波动而产生的,例如,在尘埃流出中。需要额外的宽的对称高斯分量来拟合CO Ori B的能级,这表示来自散射光的贡献。最后,关闭阶段的CO Ori A被用来调查是否12.4年的周期性与未检测到的第三个组成部分,如前所述。我们排除了在CO Ori A的17.3 -20质量范围内对K带通量贡献超过3.6%的任何额外的同伴。
The primary star in the young stellar object binary CO Ori displays UX Ori-type variability: irregular, high amplitude optical, and near-infrared photometric fluctuations where flux minima coincide with polarization maxima. This is attributed to changes in local opacity. In CO Ori A, these variations exhibit a 12.4 yr cycle. Here, we investigate the physical origin of the fluctuating opacity and its periodicity using interferometric observations of CO Ori obtained using VLTI/GRAVITY. ContinuumK-band circum-primary and circum-secondary emission are marginally spatially resolved for the first time, while Brγ emission is detected in the spectrum of the secondary. We estimate a spectral type range for CO Ori B of K2–K5 assuming visual extinction,AV= 2 and a distance of 430 pc. From geometric modelling of the continuum visibilities, the circum-primary emission is consistent with a central point source plus a Gaussian component with a full width at half-maximum of 2.31 ± 0.04 mas, inclined at 30.2° ± 2.2° and with a major axis position angle of 40° ± 6°. This inclination is lower than that reported for the discs of other UX Ori-type stars, providing a first indication that the UX Ori phenomena may arise through fluctuations in circum-stellar material exterior to a disc, for example, in a dusty outflow. An additional wide, symmetric Gaussian component is required to fit the visibilities of CO Ori B, signifying a contribution from scattered light. Finally, closure phases of CO Ori A were used to investigate whether the 12.4 yr periodicity is associated with an undetected third component, as has been previously suggested. We rule out any additional companions contributing more than 3.6 per cent to theK-band flux within ∼7.3–20 mas of CO Ori A.
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