V4739 Sgr : Nova Sgr 2001 No. 2

IAUC 7692 tells that A. J. S. Pereira discovered a nova at 7.6mag on August 26. P. Schmeer reported a possible quiescent object of r=17.5, b=19.4 USNO star (vsnet-campaign-nova 472). B. Liller reported that no object was seen on August 18.04 and a low-resolution spectrum with 0.20m telescope showed the H-alpha emission (vsnet-campaign-nova 485). M. Fujii performed spectroscopy and obtained a spectrum with H-alpha (FWHM=4700km/s) and H-beta emission lines. He suggested that this nova is a He/N-type nova and the spectrum is similar to that of the reccurent nova, U Sco (vsnet-campaign-nova 487).


CCD image by Giancarlo Ubaldo Nappi, image on the day of the discovery

The object rapidly faded since around August 28 (vsnet-campaign-nova 488, 493). The decline speed became rather gradual on August 30 (vsnet-campaign-nova 497, 500), and then, again rapidly faded on August 31 vsnet-campaign-nova 502, 505). The fading seems to be stopped around September 8-9 (vsnet-campaign-nova 552), and again start fading on September 11 (vsnet-campaign-nova 556).

Other related articles: vsnet-campaign-nova 477, 474, 475, 476, 478, 480, 483, 486, 487, 499, 506, 509, 511, 513, 524, 535, 542, 556, 562, 570, 584

Links:
Spectrum by M. Fujii: http://www1.harenet.ne.jp/~aikow/v4739_sgr.gif
Image by G. U. Nappi: http://www.kusastro.kyoto-u.ac.jp/vsnet/Novae/nsgr01-2.html

General Information on This Object