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  1. 理工学研究科
  2. 理工学研究科・学術誌論文

THE SPATIO-KINEMATICAL STRUCTURE AND DISTANCE OF THE PREPLANETARY NEBULA IRAS 19134+2131

http://hdl.handle.net/10232/26180
http://hdl.handle.net/10232/26180
6ea3fa3d-736a-4e60-b4c3-2403ee960142
名前 / ファイル ライセンス アクション
The The Spatio-Kinematical Structure and Distance of the Preplanetary Nebula IRAS 19134+2131.pdf (927.6 kB)
Item type 学術雑誌論文 / Journal Article(1)
公開日 2016-03-15
タイトル
タイトル THE SPATIO-KINEMATICAL STRUCTURE AND DISTANCE OF THE PREPLANETARY NEBULA IRAS 19134+2131
タイトル言語 en
著者 今井, 裕

× 今井, 裕

WEKO 116448

en Imai, Hiroshi

ja 今井, 裕

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Sahai, Raghvendra

× Sahai, Raghvendra

WEKO 116449

en Sahai, Raghvendra

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Morris, Mark

× Morris, Mark

WEKO 116450

en Morris, Mark

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言語
言語 eng
キーワード
主題言語 en
主題Scheme Other
主題 masers -- stars
キーワード
主題言語 en
主題Scheme Other
主題 AGB and post-AGB -- stars
キーワード
主題言語 en
主題Scheme Other
主題 individual (IRAS 19134+2131) -- stars
キーワード
主題言語 en
主題Scheme Other
主題 kinematics -- stars
キーワード
主題言語 en
主題Scheme Other
主題 mass loss -- stars
キーワード
主題言語 en
主題Scheme Other
主題 winds, outflows
資源タイプ
資源タイプ識別子 http://purl.org/coar/resource_type/c_6501
資源タイプ journal article
要約
内容記述タイプ Other
内容記述 Using the Very Long Baseline Array at six epochs, we have observed H2O maser emission in the preplanetary nebula IRAS 19134+2131 (I19134), in which the H2O maser spectrum has two groups of emission features separated in radial velocity by ~100 km s^-1. We also obtained optical images of I19134 with the Hubble Space Telescope to locate the bipolar reflection nebula in this source for the first time. The spatio-kinematical structure of the H2O masers indicates the existence of a fast, collimated (precessing) flow having a projected extent of ~140 mas and an expansion rate of ~1.9 mas yr^-1 on the sky plane, which gives a dynamical age of only ~40 yr. The two detected optical lobes are also separated by ~150 mas in almost the same direction as that of the collimated flow. The good agreement between the extent and orientation of the H2O maser outflow and optical lobes suggests that the lobes have been recently formed along the collimated fast flow. Thus, the circumstellar envelope around the evolved star has apparently been penetrated by the fast flow and has been cleared for the emergence of the starlight in the directions of the fast flow. The positions of all of the detected maser features have been measured with respect to the extragalactic reference source J1925+2106 over one year. Therefore, we analyzed maser feature motions that consist of the combination of an annual parallax, a secular motion following Galactic rotation, and the intrinsic motions within the flow.We obtain an annualparallax distance to I19134 of D = 8.0[+0.9 -0.7] kpc and estimate its location in the Galaxy to be (R, θ, z) = (7:4[+0.4 -0.3] kpc, 62° ± 5°, 0.65[+0.07 -0.06] kpc). From the mean motion of the blueshifted and redshifted clusters of maser features, we estimate the three-dimensional (3D) secularmotion of I19134 to be (V_R, V_θ, V_z) = (3[+53 -46], 125[+20 -28], 8[+48 -39]) km s^-1. From the height from the Galactic plane, z, and the velocity component perpendicular to the Galactic plane, V_z, we estimate a rough upper limit of ~9 M to the stellar mass of I19134's progenitor.
内容記述言語 en
収録雑誌名 en : The Astronomical Journal

巻 669, 号 1, p. 424-434, 発行日 2007
作成日
日付 2007-11-01
日付タイプ Issued
ISSN
収録物識別子タイプ PISSN
ISSN 00046256
NII書誌ID(雑誌)
収録物識別子タイプ NCID
NC ID AA00552749
DOI
識別子タイプ DOI
DOI https://doi.org/10.1086/521350
権利
権利情報の言語 en
権利情報 American Astronomical Society
出版タイプ
出版タイプ VoR
出版タイプResource http://purl.org/coar/version/c_970fb48d4fbd8a85
NDC
主題Scheme NDC
主題 440
公開者・出版者
出版者 American Astronomical Society/IOP Publishing
出版者言語 en
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