SiO MASERS IN ASYMMETRIC MIRAS. III. IK TAURI

SiO MASERS IN ASYMMETRIC MIRAS. III. IK TAURI
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不对称 MIRAS 中的 SiO 脉塞。

DOI:
10.1088/0067-0049/187/1/107
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发表时间:
2010
期刊:
The Astrophysical Journal Supplement Series
影响因子:
--
通讯作者:
M. G. Lacasse
M. G. Lacasse
中科院分区:
--
文献类型:
--
作者:
W. D. Cotton;S. Ragland;E. A. Pluzhnik;W. C. Danchi;W. A. Traub;L. A. Willson;M. G. Lacasse

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这是一系列在7毫米波长的SiO脉泽对Mira变星样本中几个渐近巨型分支星进行多历元观测的第三篇论文,显示了红外不对称结构的证据。通过红外光学望远镜阵列和甚长基线阵列的SiO脉泽测量,在红外干涉测量中观测到这些恒星。本文介绍了金牛座IK (IK Tau)的观测结果。脉泽在恒星周围有一个持续的椭圆分布,大小为~ 40 × ~ 30 mas,长轴的位置角为~ 30°。星周包层中的SiO脉泽表现出大规模的系统运动,在十年的时间尺度上,大致是尘埃壳喷射之间的间隔。视自旋体运动在天空中的方向与脉泽椭圆长轴的方向相差37°(2.5σ),使得任何关系都不确定。IK Tau的系统速度估计为33.3±1.0 km s−1。与Gray等人的模型计算进行了比较,该模型计算预测了一些但不是所有观察到的特征。
This is the third paper in a series of multi-epoch observations at 7 mm wavelength of the SiO masers in several asymptotic giant branch stars from a sample of Mira variable stars showing evidence of asymmetric structure in the infrared. These stars have been observed interferometrically in the infrared by Infrared Optical Telescope Array and with Very Long Baseline Array measurements of the SiO masers. In this paper, we present the observations of IK Tauri (IK Tau). There is a persistent elliptical distribution of the masers around the star ∼40 × ∼30 mas in size with a major axis at position angle ∼30°. The SiO masers in the circumstellar envelope exhibit large-scale systematic motions which reverse direction on timescales of a decade, roughly the interval between the ejections of dust shells. The orientations on the sky of the apparent rotation-like bulk motion and of the major axis of the maser ellipse differ by 37° (2.5σ) making any relationship uncertain. The systemic velocity of IK Tau is estimated to be 33.3 ± 1.0 km s−1. A comparison is made with the model calculations of Gray et al. which predict some but not all observed features.
麻省理工学院/哈佛大学和史密森尼 CfA/佛罗里达大学(美国)
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