Surveys and high resolution imaging of jets from evolved stars

• Project/Area Number: 20540234
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Astronomy
• Research Institution: Kagoshima University
• Principal Investigator: IMAI Hiroshi Kagoshima University, 理工学研究科(理学系), 准教授 (70374155)
• Co-Investigator(Kenkyū-buntansha): DEGUCHI Shuji 国立天文台, 野辺山宇宙電波観測所, 准教授 (20197825)
• Co-Investigator(Renkei-kenkyūsha): HIROTA Tomoya 国立天文台, 水沢VLBI観測所, 助教 (10325764) ; HONMA Mareki 国立天文台, 水沢VLBI観測所, 准教授 (20332166) ; NAKAGAWA Akiharu 鹿児島大学, 理工学研究科(理学系), 助教 (60535631)
• Research Collaborator: NAKASHIMA Jun-ichi 香港大学, 理学部, 助理教授 ; KWOK Sun 港大学, 理学部, 教授 ; HE Jin-Hua 雲南天文台(中国), 研究員 ; DIAMOND Philip J. Commonwealth Scientific and Industrial Research Organisation (オーストラリア), 教授 ; UKITA Nobuharu 国立天文台, 光赤外研究部, 准教授 ; SAKAI Tsuyoshi 東京大学, 天文教育研究センター, プロジェクト助教 ; TAFOYA Daniel 鹿児島大学, 大学院・理工学研究科, 日本学術振興会外国人研究員
• Project Period (FY): 2008 – 2010
• Project Status: Completed (Fiscal Year 2010)
• Budget Amount: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000); Fiscal Year 2010: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2009: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2008: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
• Keywords: 電波天文学 / 宇宙メーザー / 近巨星枝星 / 老星ジェット / 超長基線電波干渉法 / 年周視差計測 / 漸近巨星枝星 / サブミリー酸化炭素輝線

Research Abstract

We have studied the "water fountain" sources that exhibit bipolar fast jets traced by water vapor maser emission and associated with evolved star. We found a "helix" pattern of jet from one the water fountains and obtained its annual parallax distance. In another source, we found high velocity components of carbon-monoxide emission and an extremely low ^<12>CO/^<13>CO intensity ratio. These results suggest that the parental stars of the water fountains should be intermediate-mass (2-8 solar masses) stars and the jets should play a major role to shape planetary nebulae.

Research Products

• [Journal Article] Annual Parallax Distance and Kinematical Property of H_2O Masers in IRAS 19312+1950 (2011)
  • Author(s): Imai H., Tafoya, D., Hirota, T., Honma, M., Miyaji, T.
  • Journal Title: Publ.Astron.Soc.Japan 63,No.1 Pages: 81-87
  • NAID: 10030384366
  • Peer Reviewed
• [Journal Article] Measurement of the Distance and Proper Motions of the H_2O Masers in the Young Planetary Nebula K 3-35 (2011)
  • Author(s): Tafoya, D., Imai, H., GOmez, Y., Torrelles, J.M., Patel, N.A., Anglada, G, Miranda, L.F., Honma, M., Hirota, T., Miyaji, T.
  • Journal Title: Publ.Astron.Soc.Japan 63,No.1 Pages: 71-80
  • NAID: 10030384331
  • Peer Reviewed
• [Journal Article] Maser Properties of the Enigmatic IRAS Source 19312+1950 (2011)
  • Author(s): Nakashima, J., Deguchi, S., Imai, H., Kemball, A., Lewis, B.M.
  • Journal Title: Astrophys.J. 728 Pages: 76-89
  • Peer Reviewed
• [Journal Article] Annual Parallax Distance and Kinematical Property of H_2O Masers in IRAS 19312+1950 (2011)
  • Author(s): Imai, Hiroshi, Tafoya, Daniel, Hirota, Tomoya, Honma, Mareki, Miyaji, Takeshi
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 63 Pages: 81-87
  • NAID: 10030384366
  • Peer Reviewed
• [Journal Article] Measurement of the Distance and Proper Motions of the H_2O Masers in the Young Planetary Nebula K 3-35 (2011)
  • Author(s): Tafoya, Daniel, Imai, Hiroshi, Gomez, Yolanda, Torrelles, Jose Maria, Patel, Nimesh, A., Anglada, Guilem., Miranda, Luis. F., Honma, Mareki, Hirota, Tomoya, Miyaji, Takeshi
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 63 Pages: 71-80
  • NAID: 10030384331
  • Peer Reviewed
• [Journal Article] Astrometry of AGB Variables with VERA-Annual Parallax and the orbit of SY～Sculptoris in the Galaxy- (2011)
  • Author(s): Nyu, Daisuke, Nakagawa, Akiharu, Matsui, Makoto, Imai, Hiroshi, et al.
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 63 Pages: 63-70
  • NAID: 10030384290
  • Peer Reviewed
• [Journal Article] Astrometry of Galactic Star-Forming Region ON 2N with VERA : Estimation of the Galactic Constants (2011)
  • Author(s): Ando, Kazuma, Nagayama, Takumi, Omodaka, Toshihiro, Handa, Toshihiro, Imai, Hiroshi, Nakagawa, Akiharu, Nakanishi, H., Honma, Mareki, Kobayashi, Hideyuki, Miyaji, Takeshi
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 63 Pages: 45-52
  • Peer Reviewed
• [Journal Article] Astrometry of H2O Masers in Nearby Star-Forming Regions with VERA-IV.L1448C (2011)
  • Author(s): Hirota, Tomoya, Honma, Mareki, Imai, Hiroshi, Sunada, Kazuyoshi, Ueno, Yuji, Kobayashi, Hideyuki, Kawaguchi, Noriyuki
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 63 Pages: 1-8
  • Peer Reviewed
• [Journal Article] Maser Properties of the Enigmatic IRAS Source 19312+1950 (2011)
  • Author(s): Nakashima, Jun-ichi, Deguchi, Shuji, Imai, Hiroshi, Kemball, Athol, Lewis, B.Murray
  • Journal Title: The Astrophysical Journal Volume: 728 Pages: 76-89
  • Peer Reviewed
• [Journal Article] Japanese VLBI Network Mapping of SiO_v=3 J=1-0 Maser Emission in W Hydrae (2010)
  • Author(s): Imai, H., Nakashima, J., Deguchi, S., Yamauchi A., Nakagawa, A., Nagayama, T.
  • Journal Title: Publ.Astron.Soc.Japan 62,No.2 Pages: 431-439
  • Peer Reviewed
• [Journal Article] DISTANCE AND PROPER MOTION MEASUREMENT OF THE RED SUPERGIANT, SPERSEI, WITH VLBI H_2O MASER ASTROMETRY (2010)
  • Author(s): Asaki, Yoshiharu, Deguchi, Shuji, Imai, Hiroshi, Hachisuka, Kazuya, Miyoshi, Makoto, Honma, Mareki
  • Journal Title: The Astrophysical Journal Volume: 721 Pages: 266-277
  • Peer Reviewed
• [Journal Article] JVN mapping of SiO v=3 J=1-0 maser emission in W Hydrae (2010)
  • Author(s): Hiroshi IMAI, Jun-ichi NAKASHIMA, Shuji DEGUCHI, AYA YAMAUCHI, Akiharu NAKAGAWA, Takumi NAGAYAMA
  • Journal Title: Publications of the Astronomical Society of Japan 62(in press)
  • Peer Reviewed
• [Journal Article] VERA observations of SiO maser emission from R Aquarii (2010)
  • Author(s): Kamohara, R., Bujarrabal, V., Houma, M., Nakagawa, A., Matsumoto, N., Oyama, T., Imai, H., Shibata, K.M., Kobayashi, H., Sato, K., Ueno, Y.
  • Journal Title: Astronomy and Astrophysics A69 Pages: 1-16
  • Peer Reviewed
• [Journal Article] CO J=3-2 Emission from the "Water Fountain" Sources IRAS 16342-3814 and IRAS 18286-0959 (2009)
  • Author(s): Imai H., He, J.-H., Nakashima, J., Ukita, N., Deguchi, S., Koning, N.
  • Journal Title: Publ.Astron.Soc.Japan 61,No.6 Pages: 1365-1372
  • NAID: 10026422026
  • Peer Reviewed
• [Journal Article] CO J=3-2 Emission from the "Water Fountain" Sources IRAS 16342-3814 and IRAS 18286-0959 (2009)
  • Author(s): Hiroshi IMAI, Jin-Hua He, Jun-ichi NAKASHIMA, Nobuharu UKITA, Shuji DEGUCHI, Nico KONING
  • Journal Title: Publications of the Astronomical Society of Japan 61 Pages: 1365-1372
  • NAID: 10026422026
  • Peer Reviewed
• [Journal Article] CO in OH/IR stars close to the Galactic centre (2009)
  • Author(s): Winnberg, A., Deguchi, S., Reid, M.J., Nakashima, J., Olofsson, H., Habing, H.J.
  • Journal Title: Astronomy and Astrophysics 497 Pages: 177-181
  • Peer Reviewed
• [Journal Article] First detection of CO lines in a water fountain star (2008)
  • Author(s): He, J.-H., Imai, H., Hasegawa, T.I., Campbell, S.W., Nakashima, J.
  • Journal Title: Astron.Astrophys. 48
  • Peer Reviewed
• [Journal Article] Japanese VLBI Network Observations of SiO Masers in the M-Type Giant IRC -10414 (2008)
  • Author(s): Ueda, K. Imai, H., et al.
  • Journal Title: Publications ofthe Astronomical Societyof Japan 60 Pages: 1051-1056
  • NAID: 10023954900
  • Peer Reviewed
• [Journal Article] A Bipolar Outflow of the M-Type Giant IRC -10414 Traced by H2O Maser Emission (2008)
  • Author(s): Maeda, T., Imai, H., et al.
  • Journal Title: Publications of the Astronomical Societyof Japan 60 Pages: 1057-1067
  • Peer Reviewed
• [Journal Article] First detection of CO lines in a water fountain star (2008)
  • Author(s): He, J. H., Imai, H., et al.
  • Journal Title: Astronomy and Astrophysics 488
  • Peer Reviewed
• [Presentation] Astrometry from VERA to SKA (2010)
  • Author(s): Hiroshi Imai
  • Organizer: Square Kilometer Array Japan Workshop 2010
  • Place of Presentation: 国立天文台(三鷹市)
  • Year and Date: 2010-11-04
• [Presentation] Stellar Maser Astrophysics Explored with the East Asian VLBI Network (2010)
  • Author(s): Hiroshi Imai
  • Organizer: 8th East Asian Meeting on Astronomy
  • Place of Presentation: Hope Hotel(中国・上海市)
  • Year and Date: 2010-10-14
• [Presentation] GASKAP : The Galactic Australian SKA Pathfinder Survey (2010)
  • Author(s): Hiroshi Imai, John Dickey, Steven Gibson, Jose Francisco G'omez, Paul Jones, Naomi M.McClure-Griffiths
  • Organizer: Asian-Pacific Radio Science Conference 2010
  • Place of Presentation: 富山国際会議場(富山市)
  • Year and Date: 2010-09-24
• [Presentation] VLBI Mapping of Multiple Maser Lines with the East Asia VLBI Network (2010)
  • Author(s): Hiroshi Imai
  • Organizer: Asian-Pacific Radio Science Conference 2010
  • Place of Presentation: 富山国際会議場(富山市)
  • Year and Date: 2010-09-23
• [Presentation] 共生星V407 Cygの新星爆発後の一酸化珪素メーザー輝線の変化 (2010)
  • Author(s): 出口修至
  • Organizer: 日本天文学会秋季年会
  • Place of Presentation: 金沢大学(金沢市)
  • Year and Date: 2010-09-22
• [Presentation] JVN mapping of multi-transitions of SiO J=1-0 maser emission (2010)
  • Author(s): Hiroshi Imai, Jun-ichi Nakashima, Shuji Deguchi, Akiharu Nakagawa, Takumi Nagayama, Aya Yamauchis
  • Organizer: East-Asia VLBI Network Workshop 2010
  • Place of Presentation: 鹿児島大学(鹿児島市)
  • Year and Date: 2010-04-22
• [Presentation] 惑星状星雲K3-35に付随する水メーザー源の年周視差計測 (2010)
  • Author(s): 今井裕
  • Organizer: 日本天文学会春季年会
  • Place of Presentation: 広島大学
  • Year and Date: 2010-03-24
• [Presentation] VLBI Mapping of Multiple Maser Lines with the East Asia VLBI Network (2010)
  • Author(s): 今井裕
  • Organizer: Asian-Pacific Radio Science Conference 2010
  • Place of Presentation: 富山
• [Presentation] VERAプロジェクトチーム"惑星状星雲K3-35にイ寸随する水メーザー源の年周視差計測 (2010)
  • Author(s): 今井裕
  • Organizer: 日本天文学会春季年会
  • Place of Presentation: 広島
• [Presentation] 一酸化珪素メーザーv=3 J=1-0輝線のVLBIによる初撮像 (2009)
  • Author(s): 今井裕
  • Organizer: 日本天文学会秋季年会
  • Place of Presentation: 山口大学
  • Year and Date: 2009-09-15
• [Presentation] 銀河面外一酸化珪素メーザー探査:星流の検出 (2009)
  • Author(s): 出口修至
  • Organizer: 日本天文学会秋季年会
  • Place of Presentation: 山口大学
  • Year and Date: 2009-09-14
• [Presentation] 若い大質量散開星団に付随する赤色超巨星からの一酸化珪素メーザー輝線 (2009)
  • Author(s): 出口 修至, ほか
  • Organizer: 日本天文学会春季年会
  • Place of Presentation: 大阪府立大学
  • Year and Date: 2009-03-26
• [Presentation] 「宇宙の噴水」を含む後漸近巨星枝星水メーザー源のVERAアストロメトリ (2009)
  • Author(s): 今井 裕, ほか
  • Organizer: 日本天文学会春季年会
  • Place of Presentation: 大阪府立大学
  • Year and Date: 2009-03-26
• [Presentation] 一酸化珪素メーザー v=3 J=1-0輝線のVLBIによる初撮像 (2009)
  • Author(s): 今井裕、出口修至、中川亜紀治、永山匠、山内彩
  • Organizer: 日本天文学会秋季年会
  • Place of Presentation: 山口
• [Presentation] 「宇宙の噴水」天体からのCO J=3-2輝線の検出 (2008)
  • Author(s): 今井 裕, 出口 修至, ほか
  • Organizer: 日本天文学会秋季年会
  • Place of Presentation: 岡山理科大学
  • Year and Date: 2008-09-11
• [Presentation] 「宇宙の噴水」天体からのCO J=3-2輝線の検出 (2008)
  • Author(s): 今井裕、Jin-Hua He, 中島淳一、出口修至
  • Organizer: 日本天文学会秋季年会
  • Place of Presentation: 岡山
• [Presentation] OH maser envelopes of the 'water fountain' sources (2008)
  • Author(s): 今井裕
  • Organizer: 9th European VLBI Network Symposium
  • Place of Presentation: イタリア・ボローニヤ
• [Remarks] ホームページ等
  • URL: http://milkyway.sci.kagoshima-u.ac.jp/~imai