{"title":"LONG-SLIT SPECTROSCOPY OF PARSEC-SCALE JETS FROM DG TAURI","authors":"Heeyoung Oh, T. Pyo, I. Yuk, Byeong-Gon Park","doi":"10.5303/JKAS.2015.48.2.113","DOIUrl":null,"url":null,"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.","PeriodicalId":49994,"journal":{"name":"Journal of the Korean Astronomical Society","volume":"4 1","pages":"113-123"},"PeriodicalIF":1.1000,"publicationDate":"2014-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"2","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of the Korean Astronomical Society","FirstCategoryId":"101","ListUrlMain":"https://doi.org/10.5303/JKAS.2015.48.2.113","RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ASTRONOMY & ASTROPHYSICS","Score":null,"Total":0}
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.
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.