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DISTANCE AND PROPER MOTION MEASUREMENT OF THE RED SUPERGIANT, PZ CAS, IN VERY LONG BASELINE INTERFEROMETRY H2O MASER ASTROMETRY
http://hdl.handle.net/10232/26218
http://hdl.handle.net/10232/26218d45b16e7-72bb-4937-9c37-5e2ce9d5ac7b
| 名前 / ファイル | ライセンス | アクション |
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1.pdf (5.0 MB)
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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 | DISTANCE AND PROPER MOTION MEASUREMENT OF THE RED SUPERGIANT, PZ CAS, IN VERY LONG BASELINE INTERFEROMETRY H2O MASER ASTROMETRY | |||||
| タイトル言語 | en | |||||
| 著者 |
楠野, こず枝
× 楠野, こず枝× 朝木, 義晴× 今井, 裕× 小山, 友明 |
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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 | Galaxy | |||||
| キーワード | ||||||
| 主題言語 | en | |||||
| 主題Scheme | Other | |||||
| 主題 | structure –- masers -– supergiants | |||||
| 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 | |||||
| アクセス権 | ||||||
| アクセス権 | open access | |||||
| アクセス権URI | http://purl.org/coar/access_right/c_abf2 | |||||
| 要約 | ||||||
| 内容記述タイプ | Other | |||||
| 内容記述 | We present the very long baseline interferometry H2O maser monitoring observations of the red supergiant, PZ Cas, at 12 epochs from 2006 April to 2008 May. We fitted maser motions to a simple model composed of a common annual parallax and linear motions of the individual masers. The maser motions with the parallax subtracted were well modeled by a combination of a common stellar proper motion and a radial expansion motion of the circumstellar envelope. We obtained an annual parallax of 0.356 ± 0.026 mas and a stellar proper motion of μ*_α cos δ = -3.7 ± 0.2 and μ*_δ= -2.0 ± 0.3 mas yr^-1 eastward and northward, respectively. The annual parallax corresponds to a trigonometric parallax of 2.81[+0.22 -0.19] kpc. By rescaling the luminosity of PZ Cas in any previous studies using our trigonometric parallax, we estimated the location of PZ Cas on a Hertzsprung–Russell diagram and found that it approaches a theoretically evolutionary track around an initial mass of ~25 M. The sky position and the distance to PZ Cas are consistent with the OB association, Cas OB5, which is located in a molecular gas super shell. The proper motion of PZ Cas is close to that of the OB stars and other red supergiants in Cas OB5 measured by the Hipparcos satellite.We derived the peculiar motion of PZ Cas of U_s = 22.8 ± 1.5, V_s = 7.1 ± 4.4, and W_s = -5.7 ± 4.4 km s^-1. This peculiar motion has rather a large U_s component, unlike those of near high-mass star-forming regions with negatively large V_s motions. The uniform proper motions of the Cas OB5 member stars suggest random motions of giant molecular clouds moving into local potential minima in a time-dependent spiral arm, rather than a velocity field caused by the spiral arm density wave. | |||||
| 内容記述言語 | en | |||||
| 収録雑誌名 |
en : The Astronomical Journal 巻 774, 号 3, p. 107, 発行日 2013 |
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| 作成日 | ||||||
| 日付 | 2013-09-10 | |||||
| 日付タイプ | Issued | |||||
| ISSN | ||||||
| 収録物識別子タイプ | PISSN | |||||
| ISSN | 00046256 | |||||
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| 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/10.1088/0004-637X/774/2/107 | |||||
| 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 | |||||
