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• W3103128822 abstract "We performed optical simultaneous dual-band (SDSS |$g^{kern1.5ptprime}$|- and i ′-bands) photometry and low-resolution spectroscopy for the WZ Sge-type dwarf nova EZ Lyn during its 2010 superoutburst. Dual-band photometry revealed that the |$g^{kern1.5ptprime} - i^{prime}$| 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, Hα and Hβ lines were detected. The Hα line showed a double-peak profile from which we estimated the disk radius ratio. The comparison of this ratio with that derived by photometry indicates that the Hα disk was larger than the photometric one, which suggests that the optically thin gas was extended to the outer region more than the optically thick gas disk and was possibly responsible for the rebrightening phenomenon. Time-series dual-band photometry during the main superoutburst revealed that color variations during the early superhump show roughly the same behavior as that of V455 And, whereas color variations during the ordinary superhump display clear anticorrelation with brightness, in contrast to that seen in V455 And. Here, we discuss different color behaviors." @default.
• W3103128822 created "2020-11-23" @default.
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• W3103128822 date "2015-02-01" @default.
• W3103128822 modified "2023-09-26" @default.
• W3103128822 title "Optical dual-band photometry and spectroscopy of the WZ Sge-type dwarf nova EZ Lyn during the 2010 superoutburst" @default.
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• W3103128822 doi "https://doi.org/10.1093/pasj/psu134" @default.
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