Asteroseismology based on high time-resolution and high dispersion spectroscopy
Project/Area Number |
23540260
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Research Category |
Grant-in-Aid for Scientific Research (C)
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Allocation Type | Multi-year Fund |
Section | 一般 |
Research Field |
Astronomy
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Research Institution | The University of Tokyo |
Principal Investigator |
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Project Period (FY) |
2011 – 2013
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Project Status |
Completed (Fiscal Year 2013)
|
Budget Amount *help |
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2013: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2012: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2011: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
|
Keywords | 星震学 / 脈動星 / 特異星 / B型輝線星 / 分光観測 / データ解析 / スペクトル線 / 恒星大気 / 衝撃波 / 恒星物理学 / 恒星脈動 / 恒星スペクトル / 国際情報交流(英国) |
Research Abstract |
The vertical wavelengths of the oscillations found in roAp stars are so short that the amplitude and phase of the variation of each spectroscopic line are highly dependent on the level of the line profile. We carried out a numerical simulation of line-profile variation by taking account of the finite thickness of the line-forming layer. We demonstrated how effective this treatment is. Barycentric corrections made to the timing of Kepler observations break the regular time-sampling of the data. A consequence is that Nyquist aliases are split into multiplets that can be identified by their shape. We provided an analytical derivation of the phenomenon, alongside demonstrations with simulated and real Kepler data. Observations indicate that a circumstellar disk is formed around a Be star while the stellar rotation is below the break-up velocity. I proposed a working hypothesis to explain this mystery by taking account of the effect of leaky waves upon angular momentum transfer.
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Report
(4 results)
Research Products
(33 results)
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[Journal Article] Shock Diagnostics in the Pulsating Proto-Subdwarf V652 Herculis2014
Author(s)
Jeffery, C. S., Montañés-Rodríguez, P., Shibahashi, H., Kurtz, D. W., Elkin, V., and Saio, H
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Journal Title
Astron. Soc. Pacific Conf. Ser
Volume: Vol. 481
Pages: 125-131
Related Report
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[Journal Article]2013
Author(s)
Jeffery, C. S., Shibahashi, H., Kurtz, D. W., Elkin, V., Montañés-Rodríguez, P., and Saio, H
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Journal Title
Astron. Soc. Pacific Conf. Ser
Volume: Vol. 479
Pages: 369-376
Related Report
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[Journal Article] Hot DAVs: a probable new class of pulsating white dwarf stars2013
Author(s)
Kurtz, D.W., Shibahashi, H., Dhillon, V.S., Marsh, T.R., Littlefair, S.P., Copperwheat, C.M., Gansicke, B.T., & Parsons, S.G.
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Journal Title
MNRAS
Volume: 432
Issue: 2
Pages: 1632-1639
DOI
Related Report
Peer Reviewed
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[Journal Article] Establishing Shock Diagnostics in the Pulsating Extreme Helium Star V642 Herculis2013
Author(s)
Jeffery, C.S., Shibahashi, H., Kurtz, D.W., Elkin, V., Montanes-Rodriguez, P., & Saio, H.
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Journal Title
ASP Conf. Ser.
Volume: 479
Pages: 369-376
Related Report
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[Journal Article] The first evidence for multiple pulsation axes: a new rapidly oscillating Ap star in the Kepler field, KIC 101959262011
Author(s)
Kurtz, D. W., Cuhna, M. S., Saio, H., Balona, L. A., Elkin, V. G., Shibahashi, H., Brandao, I. M., Uytterhoeven, K., Frandsen, S., Frimann, S. Hatzes, A. Lueftinger, T. Gruberbauer, M., Kjeldsen, H., Christensen-Dalsgaard, J., and Kawaler, S. D
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Journal Title
Monthly Notices Roy. Astron. Soc
Volume: Vol. 414, Issue 3
Issue: 3
Pages: 2550-2566
DOI
Related Report
Peer Reviewed
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