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  1. 理工学研究科
  2. 理工学研究科・学術誌論文

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/10232/26218
d45b16e7-72bb-4937-9c37-5e2ce9d5ac7b
名前 / ファイル ライセンス アクション
1.pdf 1.pdf (5.0 MB)
Item type 学術雑誌論文 / Journal Article(1)
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
著者 KUSUNO, Kozue

× KUSUNO, Kozue

WEKO 123366

KUSUNO, Kozue

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ASAKI, Yoshiharu

× ASAKI, Yoshiharu

WEKO 123367

ASAKI, Yoshiharu

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IMAI, Hiroshi

× IMAI, Hiroshi

WEKO 123368

IMAI, Hiroshi

Search repository
OYAMA, Tomoaki

× OYAMA, Tomoaki

WEKO 123369

OYAMA, Tomoaki

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別言語の著者
姓名 楠野, こず枝
別言語の著者
姓名 朝木, 義晴
別言語の著者
姓名 今井, 裕
別言語の著者
姓名 小山, 友明
言語
言語 eng
キーワード
主題Scheme Other
主題 Galaxy
キーワード
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
要約(Abstract)
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.
収録雑誌名 The Astronomical Journal

巻 774, 号 3, p. 107, 発行日 2013
作成日
日付 2013-09-10
ISSN
収録物識別子タイプ ISSN
ISSN 0004-6256
NII書誌ID(雑誌)
収録物識別子タイプ NCID
NC ID AA00552749
DOI
識別子タイプ DOI
DOI info:doi/10.1088/0004-637X/774/2/107
権利
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
公開者・出版者
出版者 IOP Publishing
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