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THE SPATIO-KINEMATICAL STRUCTURE AND DISTANCE OF THE PREPLANETARY NEBULA IRAS 19134+2131
http://hdl.handle.net/10232/26180
http://hdl.handle.net/10232/261806ea3fa3d-736a-4e60-b4c3-2403ee960142
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
The Spatio-Kinematical Structure and Distance of the Preplanetary Nebula IRAS 19134+2131.pdf (927.6 kB)
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| Item type | 学術雑誌論文 / Journal Article(1) | |||||
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| 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× Sahai, Raghvendra× 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 |
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| 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 | |||||
