摘要
Results of first CCD photometry during the recent deep light decline, and high-resolution spectroscopy, are presented Dr DY Persei. The spectra show variable blueshifted features in the sodium D lines. The CI lines are strong whereas neutroncapture elements are not enhanced. The isotopic 13CN(2,0) lines relative to 12CN are of similar strength with those for the carbon star U Hya. All these confirm the RGB nature of DY Per and the existence of ejected clouds. At least two clouds are revealed at -197.3 and -143.0 km s-1. A star was detected about 074 to the west and 2″.5 to the north from DY Per. This anonymous companion, with observed colour indices (B - V) = 0.68 and (V - R) ≃ 1.1, may be a foreground star.
原文 | ???core.languages.en_GB??? |
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頁(從 - 到) | L13-L16 |
期刊 | Astronomy and Astrophysics |
卷 | 438 |
發行號 | 2 |
DOIs | |
出版狀態 | 已出版 - 8月 2005 |