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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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| 発行・発表の年月 | 2015/02 |
| 形態種別 | 研究論文 |
| 査読 | 査読あり |
| 標題 | Optical dual-band photometry and spectroscopy of the WZ Sge-type dwarf nova EZ Lyn during the 2010 superoutburst |
| 執筆形態 | その他 |
| 掲載誌名 | PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN |
| 出版社・発行元 | OXFORD UNIV PRESS |
| 巻・号・頁 | 67(1) |
| 著者・共著者 | Isogai, Mizuki,Arai, Akira,Yonehara, Atsunori,Kawakita, Hideyo,Uemura, Makoto,Nogami, Daisaku |
| 概要 | We performed optical simultaneous dual-band (SDSS g'- and i'-bands) photometry and low-resolution spectroscopy for the WZ Sge-type dwarf nova EZ Lyn during its 2010 super-outburst. Dual-band photometry revealed that the g' - i' color reddened with a decrease in brightness during the main superoutburst and the following rebrightening phase, whereas the color became bluer with a further decrease in brightness during the slow, final decline phase. With a fit to our photometric results by a blackbody function, we estimated the disk radius ratio (ratio of the disk radius to the binary separation) and compared this with that of V455 And, a WZ Sge-type object that did not show any rebrightening in the 2007 superoutburst. The comparison revealed: (1) the disk radius ratio of EZ Lyn decreased more slowly than that of V455 And, and (2) the radius ratio of EZ Lyn at the end of the main superoutburst was larger than that of V455 And. These results favor the mass reservoir model for the mechanism of rebrightening. During both the superoutburst plateau and subsequent rebrightening phase, H alpha and H beta lines were detected. The H alpha line showed a double-peak profile from which we estimated |
| DOI | 10.1093/pasj/psu134 |
| ISSN | 0004-6264 |