National Tsing Hua University Institutional Repository:Synthetic images and long-slit spectra of protostellar jets
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    National Tsing Hua University Institutional Repository > 歷任校長 > 徐遐生 (2002-2006) > 期刊論文 >  Synthetic images and long-slit spectra of protostellar jets


    题名: Synthetic images and long-slit spectra of protostellar jets
    作者: Shang, H.;Shu, F.H.;Glassgold, A.E.
    教師: 徐遐生
    日期: 1998
    出版者: American Astronomical Society
    關聯: ASTROPHYSICAL JOURNAL, American Astronomical Society, Volume 493, Issue 2, Part 2, FEB 1 1998, Pages L91-L94
    关键词: line: profiles
    stars: pre-main sequence
    ISM: jets and outflows
    摘要: We construct synthetic images and long-slit spectra of protostellar jets modeled as steady state X-winds. Assuming uniform ionization fractions and electron temperatures, we calculate non-LTE level populations for five-level atoms. Synthetic images in the [S II] lambda 6716/lambda 6731 and [O I] lambda 6300/lambda 6364 lines have roughly the same surface brightness as observed jets if we ignore their knotty structure. Long-slit spectra taken with the slit placed along the central axis of the jet, or slightly displaced laterally from it, provide strong evidence in support of the X-wind theory. In both the models and the actual objects, wide line profiles, containing both large positive and negative velocities, are often seen at the base of the flow, indicative of a wide angle wind. As one progresses up the length of the slit, the line profiles narrow to straddle the projected velocity of a highly collimated jet.
    显示于类别:[ 徐遐生 (2002-2006)] 期刊論文
    [物理系] 期刊論文


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