naa a22 4500 510790194 CHVBK 20180411083317.0 cr unu---uuuuu 180411e20130301xx s 000 0 eng 10.1134/S1063773713030018 doi (NATIONALLICENCE)springer-10.1134/S1063773713030018 Rapid photometric and spectroscopic evolution of the young planetary nebula Hen 3-1357 and its central star SAO 244567 [Elektronische Daten] [V. Arkhipova, N. Ikonnikova, A. Kniazev, Andry Rajoelimanana] We present the results of spectroscopic and photometric observations for the young compact planetary nebula Hen 3-1357 and its central star SAO 244567. High-resolution spectroscopy has allowed the expansion velocity of the nebula, V exp = 8.4 ± 1.5 km s−1, and the heliocentric velocity of the object, V r = +12.6 ± 1.7 km s−1, to be determined. The gas shell parameters (N e , T e ), the extinction in the Hβ line, and the O, N, Ne, Ar, S, Cl, He, and C abundances have been determined from low-resolution spectra taken in 1992 and 2011. We have found significant changes in the relative intensities of forbidden lines in the spectrum of Hen 3-1357 within the last 20 years: the low-excitation [O I], [O II], and [N II] lines became stronger relative to Hβ by a factor of ∼2, while the [O III] lines weakened by a factor of ∼ 2, suggesting a decrease in the excitation class of the nebula. The V-band photometry performed under the ASAS-3 program revealed a decline in the yearly mean brightness of SAO 244 567 from 2001 to 2009 by $$0_.^m 5$$ and rapid variability with an amplitude of a few tenths of a magnitude. Published observational data in a wide spectral range, from the near ultraviolet to the radio band, suggest an appreciable weakening of the flux from the star and the nebula. Pleiades Publishing, Ltd., 2013 spectroscopic and photometric observations nationallicence planetary nebulae nationallicence evolution nationallicence Arkhipova V. Moscow State University, 119991, Moscow, Russia aut Ikonnikova N. Moscow State University, 119991, Moscow, Russia aut Kniazev A. Moscow State University, 119991, Moscow, Russia aut Rajoelimanana Andry South African Astronomical Observatory, Cape Town, South Africa aut Astronomy Letters SP MAIK Nauka/Interperiodica 39/3(2013-03-01), 201-213 1063-7737 39:3<201 2013 39 11443 https://doi.org/10.1134/S1063773713030018 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1134/S1063773713030018 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Arkhipova V. Moscow State University, 119991, Moscow, Russia aut NATIONALLICENCE 700 1- Ikonnikova N. Moscow State University, 119991, Moscow, Russia aut NATIONALLICENCE 700 1- Kniazev A. Moscow State University, 119991, Moscow, Russia aut NATIONALLICENCE 700 1- Rajoelimanana Andry South African Astronomical Observatory, Cape Town, South Africa aut NATIONALLICENCE 773 0- Astronomy Letters SP MAIK Nauka/Interperiodica 39/3(2013-03-01), 201-213 1063-7737 39:3<201 2013 39 11443 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer