A&A 438, L13–L16 (2005) Astronomy DOI: 10.1051/0004-6361:200500118 & c ESO 2005 Astrophysics Editor The cool Galactic R Coronae Borealis variable DY Persei the 1 2 1 2 3,4,5 6 2 L. Zacsˇ ,W.P.Chen , O. Alksnis , D. Kinoshita ,F.A.Musaev , T. Brice , K. Sanchawala , to H. T. Lee2, and C. W. Chen2 1 Institute of Atomic Physics and Spectroscopy, University of Latvia, Rai¸na bulvaris¯ 19, 1586 R¯ıga, Latvia e-mail:
[email protected] Letter 2 Graduate Institute of Astronomy, National Central University, Chung-Li 32054, ROC, Taiwan e-mail:
[email protected] 3 Special Astrophysical Observatory and Isaac Newton Institute of Chile, SAO Branch, Nizhnij Arkhyz 369167, Russia e-mail:
[email protected] 4 ICAMER, National Academy of Sciences of Ukraine, 361605 Peak Terskol, Kabardino-Balkaria, Russia 5 Shamakhy Astrophysical Observatory, National Academy of Sciences of Azerbaijan, Azerbaijan 6 1.State Gimnazium of Riga, Rai¸na bulvaris¯ 8, 1050 R¯ıga, Latvia e-mail:
[email protected] Received 1 March 2005 / Accepted 28 April 2005 Abstract. 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 neutron- capture 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 RCB 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.