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ヨネハラ アツノリ
YONEHARA ATSUNORI
米原 厚憲 所属 京都産業大学 理学部 宇宙物理・気象学科 職種 教授 |
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| 言語種別 | 英語 |
| 発行・発表の年月 | 1997/09 |
| 形態種別 | 研究論文 |
| 標題 | Cellular-automaton model for flickering of cataclysmic variables |
| 執筆形態 | その他 |
| 掲載誌名 | ASTROPHYSICAL JOURNAL |
| 出版社・発行元 | IOP PUBLISHING LTD |
| 巻・号・頁 | 486(1),pp.388-396 |
| 著者・共著者 | A Yonehara,S Mineshige,WF Welsh |
| 概要 | A new model is presented to elucidate the optical-ultraviolet ''flickering'' variability in cataclysmic variables. In this model, light fluctuations are produced by occasional flarelike events and subsequent avalanche Bow in the accretion disk atmospheres. Flares are assumed to be ignited when the mass density exceeds a critical density. The disk then evolves to and stays at a self-organized critical state, in which seemingly chaotic fluctuations can be produced. We calculated fluctuating light curves by cellular-automaton simulations. The resultant power spectral density (PSD) consists of a flat part [S(f) proportional to f(0), where f is frequency] at lower frequencies and a steep-decline part [S(f) proportional to f(-beta), with beta similar or equal to 1-2] at higher frequencies. It is important that the PSD is rather insensitive to wavelength. |
| DOI | 10.1086/304501 |
| ISSN | 0004-637X/1538-4357 |