Electronic Telegram No. 2205 Central Bureau for Astronomical Telegrams INTERNATIONAL ASTRONOMICAL UNION CBAT Director: Daniel W. E. Green; Room 209; Dept. of Earth and Planetary Sciences; Harvard University; 20 Oxford St.; Cambridge, MA 02138; U.S.A. e-mail: cbat@iau.org; cbatiau@eps.harvard.edu URL http://www.cfa.harvard.edu/iau/cbat.html V407 CYGNI H. Maehara, Kwasan Observatory, Kyoto University, forwards all of the reports below to the Central Bureau. Previous reports concerning V407 Cyg appeared on CBETs 2199 and 2204. K. Imamura, Okayama University of Science, reports that a low-resolution spectrogram (range 420-830 nm) of the symbiotic star V407 Cyg was taken on Mar. 13.851 UT with a 28-cm telescope. The spectrum shows the Balmer series, He I (587.8, 667.8, 706.5 nm), O I (777.4 nm), Mg II (789.0 nm), and Fe II (42) emission lines. The spectrum can be seen at the following website URL: http://blog-imgs-32-origin.fc2.com/t/n/b/tnblab/V407_Cyg20100313.png. Imamura also reports the following magnitudes of V407 Cyg obtained with a 23.5-cm telescope: Mar. 13.855, V = 8.76; 13.859, B = 9.55. M. Fujii, Okayama, Japan, reports that a low-resolution spectrogram (range 400-830 nm) of V407 Cyg was taken on Mar. 13.793 with a 40-cm telescope. The spectrum shows strong Balmer series, Fe II (multiplets 27, 37, 42, 48, 49, 55, 74), He I (587.6, 667.8, 706.5 nm), and O I (777.4 nm) emission lines. The FWHM of the H_alpha emission line is 1600 km/s. The spectrum can be seen at http://otobs.org/FBO/fko/nova/v407_cyg_20100313.gif. Maehara adds that he obtained a low-resolution spectrogram (range 400-800 nm) of V407 Cyg on Mar. 13.842 UT with a 25-cm telescope. The spectrum shows the Balmer series, He I (587.8, 667.8, 706.5 nm), and Fe II emission lines. The FWHMs of H_alpha, H_beta, H_delta, and He I 587.8-nm emissions are 1600, 2400, 2400, and 1600 km/s, respectively. The spectrum can be seen at website URL http://www.kwasan.kyoto-u.ac.jp/~maehara/novae/CYGV407-20100313.png. CCD images obtained with a 25-cm telescope around Mar. 13.83 yield the following magnitudes: Mar. 13.8291, I_c = 5.93; 13.8293, R_c = 7.18; 13.8309, V = 8.83; 13.8309, B = 9.58. Maehara notes that these features suggest that the current unusual brightening of V407 Cyg is caused by a nova outburst in a symbiotic system. K. Hirosawa, Aichi, Japan, reports following visual magnitude estimates: Mar. 13.795 UT, 8.7; 13.843, 8.8. NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2010 CBAT 2010 March 14 (CBET 2205) Daniel W. E. Green