VLBI Astrometry of AGB Variables with VERA -- A Semiregular Variable S Crateris
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, referre...
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| creator | 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 |
| description | 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. |
| doi_str_mv | 10.48550/arxiv.0808.1151 |
| format | Article |
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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><identifier>EISSN: 2331-8422</identifier><identifier>DOI: 10.48550/arxiv.0808.1151</identifier><language>eng</language><publisher>Ithaca: Cornell University Library, arXiv.org</publisher><subject>Angular distribution ; Angular velocity ; Astrometry ; Distance measurement ; Mira variables ; Outflow ; Parallax ; Photosphere ; Physics - Astrophysics of Galaxies ; Physics - Cosmology and Nongalactic Astrophysics ; Physics - Earth and Planetary Astrophysics ; Physics - High Energy Astrophysical Phenomena ; Physics - Instrumentation and Methods for Astrophysics ; Physics - Solar and Stellar Astrophysics ; Quasars ; Radio telescopes ; Velocity distribution</subject><ispartof>arXiv.org, 2008-08</ispartof><rights>2008. This work is published under http://arxiv.org/licenses/nonexclusive-distrib/1.0/ (the “License”). 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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><subject>Angular distribution</subject><subject>Angular velocity</subject><subject>Astrometry</subject><subject>Distance measurement</subject><subject>Mira variables</subject><subject>Outflow</subject><subject>Parallax</subject><subject>Photosphere</subject><subject>Physics - Astrophysics of Galaxies</subject><subject>Physics - Cosmology and Nongalactic Astrophysics</subject><subject>Physics - Earth and Planetary Astrophysics</subject><subject>Physics - High Energy Astrophysical Phenomena</subject><subject>Physics - Instrumentation and Methods for Astrophysics</subject><subject>Physics - Solar and Stellar Astrophysics</subject><subject>Quasars</subject><subject>Radio telescopes</subject><subject>Velocity 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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</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a510-3d22618ebcfed8f50bef44af4ea9f290d466561cc582bd2d4146f89a9705ba7b3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2008</creationdate><topic>Angular distribution</topic><topic>Angular velocity</topic><topic>Astrometry</topic><topic>Distance measurement</topic><topic>Mira variables</topic><topic>Outflow</topic><topic>Parallax</topic><topic>Photosphere</topic><topic>Physics - Astrophysics of Galaxies</topic><topic>Physics - Cosmology and Nongalactic Astrophysics</topic><topic>Physics - Earth and Planetary Astrophysics</topic><topic>Physics - High Energy Astrophysical Phenomena</topic><topic>Physics - Instrumentation and Methods for Astrophysics</topic><topic>Physics - Solar and Stellar Astrophysics</topic><topic>Quasars</topic><topic>Radio telescopes</topic><topic>Velocity distribution</topic><toplevel>online_resources</toplevel><creatorcontrib>Nakagawa, Akiharu</creatorcontrib><creatorcontrib>Tsushima, Miyuki</creatorcontrib><creatorcontrib>Ando, Kazuma</creatorcontrib><creatorcontrib>Bushimata, Takeshi</creatorcontrib><creatorcontrib>Choi, Yoon Kyung</creatorcontrib><creatorcontrib>Hirota, Tomoya</creatorcontrib><creatorcontrib>Honma, 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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.</abstract><cop>Ithaca</cop><pub>Cornell University Library, arXiv.org</pub><doi>10.48550/arxiv.0808.1151</doi><oa>free_for_read</oa></addata></record> |
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| subjects | Angular distribution Angular velocity Astrometry Distance measurement Mira variables Outflow Parallax Photosphere Physics - Astrophysics of Galaxies Physics - Cosmology and Nongalactic Astrophysics Physics - Earth and Planetary Astrophysics Physics - High Energy Astrophysical Phenomena Physics - Instrumentation and Methods for Astrophysics Physics - Solar and Stellar Astrophysics Quasars Radio telescopes Velocity distribution |
| title | VLBI Astrometry of AGB Variables with VERA -- A Semiregular Variable S Crateris |
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