naa a22 4500 510790240 CHVBK 20180411083317.0 cr unu---uuuuu 180411e20131001xx s 000 0 eng 10.1134/S1063773713090028 doi (NATIONALLICENCE)springer-10.1134/S1063773713090028 Spectroscopic studies of four planetary nebulae with emission-line nuclei [Elektronische Daten] [M. Burlak, A. Kniazev] Spectroscopic observations of four planetary nebulae (PNe) with emission-line central stars of different spectral types are presented: Cn 1-5, Pe 1-1, NGC 5873, and M1-19. The interstellar extinction, physical conditions (n e , T e ), and abundances of several elements (He, N, O, Ne, S, Ar, Cl) have been determined for all nebulae. The nebula Cn 1-5 with fairly high abundances of helium and nitrogen is shown to belong to type I PNe. Possible variability of the intensities of low-excitation emission lines in NGC 5873 has been found; it can be related to variations of the stellar wind from the central star. The measured α-element abundance ratios (S/O, Ne/O, Ar/O, Cl/O) are in good agreement with those typical of HII regions. Pleiades Publishing, Inc., 2013 planetary nebulae nationallicence emission-line central stars nationallicence chemical composition nationallicence Burlak M. Sternberg Astronomical Institute, Universitetskii pr. 13, 119992, Moscow, Russia aut Kniazev A. Sternberg Astronomical Institute, Universitetskii pr. 13, 119992, Moscow, Russia aut Astronomy Letters Springer US; http://www.springer-ny.com 39/10(2013-10-01), 703-716 1063-7737 39:10<703 2013 39 11443 https://doi.org/10.1134/S1063773713090028 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1134/S1063773713090028 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Burlak M. Sternberg Astronomical Institute, Universitetskii pr. 13, 119992, Moscow, Russia aut NATIONALLICENCE 700 1- Kniazev A. Sternberg Astronomical Institute, Universitetskii pr. 13, 119992, Moscow, Russia aut NATIONALLICENCE 773 0- Astronomy Letters Springer US; http://www.springer-ny.com 39/10(2013-10-01), 703-716 1063-7737 39:10<703 2013 39 11443 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer