| Item type |
会議発表論文 / Conference Paper(1) |
| 公開日 |
2015-03-26 |
| タイトル |
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タイトル |
Soft X-ray emission and lithium production in Cen X-4 during quiescence |
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言語 |
en |
| 言語 |
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|
言語 |
eng |
| キーワード |
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|
言語 |
en |
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主題Scheme |
Other |
|
主題 |
accretion, accretion disks - neutron stars - nuclear reactions, nucleosynthesis, abundances - stars : abundances |
| 資源タイプ |
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資源タイプ識別子 |
http://purl.org/coar/resource_type/c_5794 |
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資源タイプ |
conference paper |
| 著者 |
藤本, 信一郎
松葉, 龍一
荒井, 賢三
Fujimoto, Shinichiro
Matsuba, Ryuichi
Arai, Kenzo
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| 著者所属 |
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熊本電波工業高等専門学校電子制御工学科 |
| 著者所属 |
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熊本大学eラーニング推進機構 |
| 著者所属 |
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熊本大学大学院自然科学研究科 |
| 著者所属（英） |
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en |
|
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Department of Electronic Control, Kumamoto National College of Technology |
| 著者所属（英） |
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|
en |
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Institute for e-Learning Development, Kumamoto University |
| 著者所属（英） |
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en |
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Department of Physics, Kumamoto University |
| 出版者 |
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出版者 |
宇宙航空研究開発機構 |
| 出版者（英） |
|
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出版者 |
Japan Aerospace Exploration Agency (JAXA) |
| 書誌情報 |
宇宙航空研究開発機構特別資料
en : JAXA Special Publication: Astrophysics with All-Sky X-Ray observations: 3rd International MAXI Workshop
巻 JAXA-SP-08-014E,
p. 152-156,
発行日 2009-02-27
|
| 会議概要（会議名, 開催地, 会期, 主催者等）（英） |
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内容記述タイプ |
Other |
|
内容記述 |
Astrophysics with All-Sky X-Ray observations: 3rd International MAXI Workshop (RIKEN, 10-12 June 2008) |
| 抄録（英） |
|
|
内容記述タイプ |
Other |
|
内容記述 |
We investigate emission mechanism of soft X-ray radiation from a neutron star soft X-ray transient (NSSXT), Cen X-4 and unusually high abundances of Li on a low-mass secondary in Cen X-4 during a quiescent state. An accretion flow in NSSXTs in quiescence is though to be an advection-dominated one and truncated by magneto-centrifugal forces due to the magnetic field of a neutron star. The advection dominated accretion flow (ADAF) is very hot (> 1 MeV) enough to synthesize abundant neutrons through the spallation of He-4 via protons in the flow. Although almost all charged nuclei in the ADAF are outflowed by the magneto-centrifugal forces, the neutrons accrete onto the neutron star because of no influence of the magnetic field on the neutrons. Consequently, the accretion flow is composed of neutrons near the neutron star. The accretion energy of the neutrons liberated on the surface of the star is a possible energy budget for soft X-ray radiation in a NSSXT in quiescence. Moreover, Li is abundantly synthesized in the ADAF through alpha-alpha reactions and is transfered to the surface of the secondary by the magneto-centrifugal forces. We find that for reasonable values of the mass accretion rate and the magnetic field of the neutron star, the estimated soft X-ray luminosity and abundance of Li on the secondary are comparable to those observed in Cen X-4. |
| ISSN |
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収録物識別子タイプ |
ISSN |
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収録物識別子 |
1349-113X |
| 書誌レコードID |
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収録物識別子タイプ |
NCID |
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収録物識別子 |
AA11984031 |
| 資料番号 |
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内容記述タイプ |
Other |
|
内容記述 |
資料番号: AA0064306031 |
| レポート番号 |
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内容記述タイプ |
Other |
|
内容記述 |
レポート番号: JAXA-SP-08-014E |
64306031.pdf (313.1 kB)
