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V407 CYGNI in Outburst

12 Mar 2010, 16:18 UTC
V407 CYGNI in Outburst
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According to Cbet No.2199 issued on March 11, 2010, the symbiotic star V407 Cyg is undergoing an apparent unusually bright outburst (mag 7.4). The outburst has been detected by Koichi Nishiyama (Fukuoka, Japan) and Fujio Kabashima (Saga, Japan) by means an unfiltered CCD image taken on Mar. 10.797 UT using a105-mm camera lens + CCD. (independent discovery of this outburst by Tadashi Kojima)We performed some follow-up of this outburst, remotely with a 0.25-m, f/4.3 reflector + CCD + Johnson V and Cousins R filters. On 2010 March 12.45, we measured Vj= 8.2 and Rc= 7.2 (accuracy about 0.1 magnitude in each band).Coordinates extracted by our images:R.A. = 21h 02m 09s.82, Decl. = +45d 46' 33".0(equinox 2000.0, reference catalogue USNO-B1)Our image:Please click here for a bigger version:http://tinyurl.com/yc7s9rvThe usual V407 Cyg observed range is magnitude 13 to fainter than 17; it may have been a slow nova in 1936, and a Mira-type variable appears involved with this object, as well. This brightening is well outside its previously stated range and may indicate a nova outburst in progress.According to the AAVSO " Suggested classifications for this source include slow nova with either a Mira secondary or Mira component, or a symbiotic star. Spectroscopy ...

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