The cool Galactic R Coronae Borealis variable DY Persei

L. Začs, W. P. Chen, O. Alksnis, D. Kinoshita, F. A. Musaev, T. Brice, K. Sanchawala, H. T. Lee, C. W. Chen
2005 Astronomy and Astrophysics  
Results of first CCD photometry during the recent deep light decline, and high-resolution spectroscopy, are presented for DY Persei. The spectra show variable blueshifted features in the sodium D lines. The C  lines are strong whereas neutroncapture elements are not enhanced. The isotopic 13 CN(2, 0) lines relative to 12 CN are of similar strength with those for the carbon star U Hya. All these confirm the RCB nature of DY Per and the existence of ejected clouds. At least two clouds are
more » ... o clouds are revealed at −197.3 and −143.0 km s −1 . A star was detected about 0. 4 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.
doi:10.1051/0004-6361:200500118 fatcat:wk3ioduxvfaprgpjr72tyns4mu