naa a22 4500 510732607 CHVBK 20180411082958.0 cr unu---uuuuu 180411e20130201xx s 000 0 eng 10.1134/S1063772913010083 doi (NATIONALLICENCE)springer-10.1134/S1063772913010083 Tarasova T. Crimean Astrophysical Observatory, 98409, Nauchnyi, Crimea, Ukraine aut Spectral variations of the nova V2468 Cyg at various stages of the development of its outburst [Elektronische Daten] [T. Tarasova] Spectral variations of the nova V2468 Cyg were studied over 1.5 years following the beginning of its outburst, during its smooth fading and the star's rebrightenings. Following the rebrightening on March 25, 2008, the profiles of H I lines had changed, from a two-component structure with peaks at −220 and 670 km/s to a four-component structure with peaks at −640, −260, 255, and 620 km/s. The profiles of [N II] 5755 Å, [O III] 5007 Å, He II 4686 Å, and [Fe VII] 6086 Å lines varied throughout the interval of our observations. During rebrightenings, the lines profiles changed and the line intensities significantly decreased. The width of the [Fe VII] 6086 Å profile varied, in addition to its shape and intensity; this profile differed from the profiles of other lines during the nebular phase. Estimates of chemical-element abundances in the nova's envelope indicate enhanced abundances of nitrogen and oxygen, compared to the Sun, and solar abundances of neon and argon. The helium abundance was somewhat higher than the solar value. The mass of the ejected envelope is estimated to be 5 × 10−5 M ⊙. Pleiades Publishing, Ltd., 2013 Astronomy Reports SP MAIK Nauka/Interperiodica 57/2(2013-02-01), 95-109 1063-7729 57:2<95 2013 57 11444 https://doi.org/10.1134/S1063772913010083 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1134/S1063772913010083 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Tarasova T. Crimean Astrophysical Observatory, 98409, Nauchnyi, Crimea, Ukraine aut NATIONALLICENCE 773 0- Astronomy Reports SP MAIK Nauka/Interperiodica 57/2(2013-02-01), 95-109 1063-7729 57:2<95 2013 57 11444 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer