Volume 438, Number 2, August I 2005
|Page(s)||L13 - L16|
|Published online||08 July 2005|
Letter to the Editor
The cool Galactic R Coronae Borealis variable DY Persei
Institute of Atomic Physics and Spectroscopy, University of Latvia, Raiņa bulvāris 19, 1586 Rīga, Latvia e-mail: firstname.lastname@example.org
2 Graduate Institute of Astronomy, National Central University, Chung-Li 32054, ROC, Taiwan e-mail: email@example.com
3 Special Astrophysical Observatory and Isaac Newton Institute of Chile, SAO Branch, Nizhnij Arkhyz 369167, Russia e-mail: firstname.lastname@example.org
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, Raiņa bulvāris 8, 1050 Rīga, Latvia e-mail: email@example.com
Accepted: 28 April 2005
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 i 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. A star was detected about 04 to the west and 25 to the north from DY Per. This anonymous companion, with observed colour indices and , may be a foreground star.
Key words: stars: carbon / stars: winds, outflows / stars: fundamental parameters / stars: circumstellar matter / stars: individual: DY Per
© ESO, 2005
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