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.
- Stars: carbon
- Stars: circumstellar matter
- Stars: fundamental parameters
- Stars: individual: DY Per
- Stars: winds, outflows