VLBA确定到附近恒星形成区的距离II。金牛座中的哈勃4号和HDE 283572
VLBA determination of the distance to nearby star-forming regions II. Hubble 4 and HDE 283572 in Taurus
摘要：
2004年9月至2005年12月期间，利用甚长基线阵列（VLBA）在6个历元上观测了金牛座T型裸星哈勃4号和金牛座HDE 283572的非热3.6厘米射电连续辐射，连续观测之间的典型间隔为3个月。由于VLBA提供了非常精确的天体测量，可以非常精确地追踪两颗恒星在天空平面上的轨迹，并将其建模为三角视差和均匀自行的叠加。哈勃4和HDE 283572的最佳拟合距离分别为132.8 +/- 0.5和128.5 +/- 0.6 pc。结合这些结果与其他两个现有的VLBI距离测定金牛座，我们估计的平均距离金牛座协会是137 pc的分散（最有可能反映复杂的深度）约20 pc。
英文摘要：
The non-thermal 3.6 cm radio continuum emission from the naked T Tauri stars Hubble 4 and HDE 283572 in Taurus has been observed with the Very Long Baseline Array (VLBA) at 6 epochs between September 2004 and December 2005 with a typical separation between successive observations of 3 months. Thanks to the remarkably accurate astrometry delivered by the VLBA, the trajectory described by both stars on the plane of the sky could be traced very precisely, and modeled as the superposition of their trigonometric parallax and uniform proper motion. The best fits yield distances to Hubble 4 and HDE 283572 of 132.8 +/- 0.5 and 128.5 +/- 0.6 pc, respectively. Combining these results with the other two existing VLBI distance determinations in Taurus, we estimate the mean distance to the Taurus association to be 137 pc with a dispersion (most probably reflecting the depth of the complex) of about 20 pc.
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