タイトル | Nobeyama Radio Observatory Report: Number 550 |
その他のタイトル | VLBI monitoring observations of water masers around the semi-regular variable star R crateris セミレギュラー変光恒星R-Crateris近傍の水メーザのVLBIモニタリング観測 |
著者(日) | Ishitsuka, Jose K.; 今井 浩; 面高 俊宏; 上野 宗孝; 亀谷 收; 笹尾 哲夫; 森本 雅樹; 宮地 竹史; 中島 潤一; 渡辺 輝彦 |
著者(英) | Ishitsuka, Jose K.; Imai, Hiroshi; Omodaka, Toshihiro; Ueno, Munetaka; Kameya, Osamu; Sasao, Tetsuo; Morimoto, Masaki; Miyaji, Takeshi; Nakajima, Junichi; Watanabe, Teruhiko |
著者所属(日) | 東京大学 教養学部 宇宙地球部会; 国立天文台 水沢観測センター; 鹿児島大学 理学部; 東京大学 教養学部 宇宙地球部会; 国立天文台 水沢観測センター; 国立天文台 VERA推進室; 兵庫県立西はりま天文台; 国立天文台 VERA推進室; 通信総合研究所 鹿島宇宙通信センター; 鹿児島大学 理学部 |
著者所属(英) | University of Tokyo Department of Earth Sciences and Astronomy, College of Arts and Science; National Astronomical Observatory Mizusawa Astrogeodynamics Observatory; Kagoshima University Faculty of Science; University of Tokyo Department of Earth Sciences and Astronomy, College of Arts and Science; National Astronomical Observatory Mizusawa Astrogeodynamics Observatory; National Astronomical Observatory VERA Project Office; Nishi-Harima Astronomical Observatory; National Astronomical Observatory VERA Project Office; Communications Research Laboratory Kashima Space Research Center; Kagoshima University Faculty of Science |
発行日 | 2001 |
発行機関など | Nobeyama Radio Observatory of the National Astronomical Observatory |
刊行物名 | Nobeyama Radio Observatory Report |
号 | 550 |
刊行年月日 | 2001 |
言語 | eng |
抄録 | Water-vapor masers around the semi-regular variable star R Crateris were monitored with the Japanese VLBI Network (J-Net) at the 22 GHz band during four epochs with intervals of one month. The relative proper motions and Doppler-velocity drifts of twelve maser features were measured. Most of them existed for longer than 80 days. The 3-D kinematics of the features indicates a bipolar expanding flow. The major axis of the asymmetric flow was estimated to be at P.A. = 136 deg. The existence of a bipolar outflow suggests that a Mira variable star had already formed a bipolar outflow. The water masers are in a region of apparent minimum radii of 1.3 x 10(exp 12) m and maximum radii of 2.6 x 10(exp 12) m, between which the expansion velocity ranges from 4.3 to 7.4 km s(exp - 1). These values suggest that the water masers are radially accelerated, but still gravitationally bound, in the water-maser region. The most positive and negative velocity-drifting features were found relatively close to the systemic velocity of the star. It was found that the blue-shifted features are apparently accelerated and the red-shifted apparently decelerated. The acceleration of only the blue-shifted features seems to be consistent with that of the expanding flow from the star. |
内容記述 | Nobeyama Radio Observatory Report |
キーワード | very long baseline interferometry; water maser; variable star; observation; data reduction; Doppler effect; red shift; blue shift; 超長基線干渉; 水メーザ; 変光恒星; 観測; データ還元; ドップラー効果; レッドシフト; ブルーシフト |
資料種別 | Technical Report |
ISSN | 0911-5501 |
SHI-NO | AA0029848000 |
URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/38386 |