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Author Nakagawa, Akiharu ♦ Tsushima, Miyuki ♦ Ando, Kazuma ♦ Bushimata, Takeshi ♦ Choi, Yoon Kyung ♦ Hirota, Tomoya ♦ Honma, Mareki ♦ Imai, Hiroshi ♦ Iwadate, Kenzaburo ♦ Jike, Takaaki ♦ Kameno, Seiji ♦ Kameya, Osamu ♦ Kamohara, Ryuichi ♦ Kan-Ya, Yukitoshi ♦ Kawaguchi, Noriyuki ♦ Kijima, Masachika ♦ Kim, Mi Kyoung ♦ Kobayashi, Hideyuki ♦ Kuji, Seisuke ♦ Kurayama, Tomoharu ♦ Maeda, Toshihisa ♦ Manabe, Seiji ♦ Maruyama, Kenta ♦ Matsui, Makoto ♦ Matsumoto, Naoko ♦ Miyaji, Takeshi ♦ Nagayama, Takumi ♦ Nakamura, Kayoko ♦ Nyu, Daisuke ♦ Oh, Chung Sik ♦ Omodaka, Toshihiro ♦ Oyama, Tomoaki ♦ Pradel, Nicolas ♦ Sakai, Satoshi ♦ Sasao, Tetsuo ♦ Sato, Katsuhisa ♦ Sato, Mayumi ♦ Shibata, Katsunori M. ♦ Suda, Hiroshi ♦ Tamura, Yoshiaki ♦ Ueda, Kousuke ♦ Ueno, Yuji ♦ Yamashita, Kazuyoshi
Source arXiv.org
Content type Text
File Format PDF
Date of Submission 2008-08-08
Language English
Subject Domain (in DDC) Computer science, information & general works ♦ Natural sciences & mathematics ♦ Astronomy & allied sciences ♦ Physics
Subject Keyword Astrophysics ♦ physics:astro-ph
Abstract We present a distance measurement for the semiregular variable S Crateris (S Crt) based on its annual parallax. With the unique dual beam system of the VLBI Exploration for Radio Astrometry (VERA) telescopes, we measured the absolute proper motion of a water maser spot associated with S Crt, referred to the quasar J1147-0724 located at an angular separation of 1.23$^{\circ}$. In observations spanning nearly two years, we have detected the maser spot at the LSR velocity of 34.7 km s$^{-1}$, for which we measured the annual parallax of 2.33$\pm$0.13 mas corresponding to a distance of 430$^{+25}_{-23}$ pc. This measurement has an accuracy one order of magnitude better than the parallax measurements of HIPPARCOS. The angular distribution and three-dimensional velocity field of maser spots indicate a bipolar outflow with the flow axis along northeast-southwest direction. Using the distance and photospheric temperature, we estimate the stellar radius of S Crt and compare it with those of Mira variables.
Description Comment: 9 pages, 4 figures, accepted for publication in PASJ (Vol.60, No.5, October 25, VERA special issue)
Educational Use Research
Learning Resource Type Article
Page Count 9


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