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V5588 SAGITTARII U. Munari, Istituto Nazionale di Astrofisica, Padova AstronomicalObservatory; and S. Dallaporta and G. L. Righetti, ANS ("Asiago Novae andSymbiotic stars") collaboration, write: "V5588 Sgr (= Nova Sgr 2011 No. 2;cf. IAUC 9203) is on a fast rise toward a bright second maximum, after theprimary maximum that it reached on Apr. 7 at B = 13.19, V = 11.30, R_c = 9.95,and I_c = 9.08. After a smooth decline that took the nova past t_2 (thetime required to decline two magnitudes from maximum) to B = 15.18, V = 13.70,R_c = 11.04 and I_c = 10.75 on Apr. 20, a rapid rise in brightness has begun.The nova on Apr. 25.11 UT was at B = 13.70, V = 11.70, R_c = 10.25, and I_c =9.30 -- still on the rise and approaching the brightness of the first maximum.It is too early to say if this will be a single secondary maximum like thosedisplayed by V2491 Cyg (Nova Cyg 2008 No. 2; Munari et al. 2011, New Astronomy16, 209), V1493 Aql (Nova Aql 1999 No. 1), and V2362 Cyg (Nova Cyg 2006;Munari et al. 2008, A.Ap. 492, 145), or whether instead it will mark thebeginning of an instability phase characterized by a series of re-brighteningand fading. In the meantime, it is interesting to note that the time intervalbetween the first and secondary maxima were 15, 45, and 240 days for V2491Cyg, V1493 Aql, and V2362 Cyg, respectively. The 18-day interval between thefirst maximum of V5588 Sgr on 2011 Apr. 7 and the current second maximumwould place V5588 Sgr close to V2491 Cyg, even if the two markedly differ inspectral classification (Fe II-type for V5588 Sgr, He/N-type for V2491 Cyg)and velocity of the ejecta (FWHM of emission lines 900 km/s for V5588 Sgr,4000 km/s for V2491 Cyg."
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Цитата: Le May от 29 Апр 2011 [10:14:01]Название темы стоит подправить Значительного поярчания в дальнейшем ожидать уже не приходится?Да, я написал автору темы просьбу о переименовывании. Вполне возможно, что еще будут отдельные поярчания. Стоит отслеживать.