LONG-SLIT SPECTROSCOPY OF PARSEC-SCALE JETS FROM DG TAURI

IF 1.1 4区物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS

Journal of the Korean Astronomical Society Pub Date : 2014-10-01 DOI:10.5303/JKAS.2015.48.2.113

Heeyoung Oh, T. Pyo, I. Yuk, Byeong-Gon Park

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引用次数: 2

Abstract

We present observational results from optical long-slit spectroscopy of parsec-scale jets of DG Tau. From HH 158 and HH 702, the optical emission lines of Hα, [O i] ??6300, 6363, [N ii] ??6548, 6584, and [S ii] ??6716, 6731 are obtained. The kinematics and physical properties (i.e., electron density, electron temperature, ionization fraction, and mass-loss rate) are investigated along the blueshifted jet up to 650′′ distance from the source. For HH 158, the radial velocity ranges from -50 to -250 km s -1 . The proper motion of the knots is 0:′′196 - 0:′′272 yr -1 . The electron density is ~10⁴ cm -3 close to the star, and decreases to ~10² cm -3 at 14′′ away from the star. Ionization fraction indicates that the gas is almost neutral in the vicinity of the source. It increases up to over 0.4 along the distance. HH 702 is located at 650′′ from the source. It shows ~ -80 km s -1 in the radial velocity. Its line ratios are similar to those at knot C of HH 158. The mass-loss rate is estimated to be about~ 10 -7 M ⊙ yr -1 , which is similar to values obtained from previous studies.

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金牛座dg秒差距尺度喷流的长缝光谱

我们给出了DG Tau的秒差距尺度射流的光学长缝光谱观测结果。从HH 158和HH 702, Hα， [O i] ??6300, 6363， [N ii] ??6548, 6584，和[S ii] ??得到6716、6731。运动学和物理性质(即电子密度、电子温度、电离分数和质量损失率)沿着距离源650英寸的蓝移射流进行了研究。对于HH 158，径向速度范围为-50到-250 km s -1。结的正常运动是0:196 - 0:272 yr -1。电子密度在离恒星近的地方是~10⁴cm -3，在离恒星14英寸的地方降低到~10²cm -3。电离分数表明气体在源附近几乎是中性的。它沿着距离增加到超过0.4。HH 702位于距离源650英寸处。它显示了~ -80 km s -1的径向速度。它的线比与HH 158的C结相似。质量损失率估计约为~ 10 -7 M⊙yr -1，这与以前的研究结果相似。

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来源期刊

Journal of the Korean Astronomical Society 地学天文-天文与天体物理

CiteScore

1.30

自引率

10.00%

发文量

审稿时长

>12 weeks

期刊介绍： JKAS is an international scientific journal publishing papers in all fields of astronomy and astrophysics. All manuscripts are subject to the scrutiny of referees. Manuscripts submitted to JKAS must comply with the ethics policy of JKAS. Six regular issues are published each year on February 28, April 30, June 30, August 31, October 31, and December 31. One year''s issues compose one volume.