naa a22 4500 510790569 CHVBK 20180411083318.0 cr unu---uuuuu 180411e20131101xx s 000 0 eng 10.1134/S1063773713110029 doi (NATIONALLICENCE)springer-10.1134/S1063773713110029 Bobylev V. Pulkovo Astronomical Observatory, Russian Academy of Sciences, Pulkovskoe sh. 65, 196140, St. Petersburg, Russia aut Orientation parameters of the Cepheid system in the Galaxy [Elektronische Daten] [V. Bobylev] Based on the distribution of long-period Cepheids, we have redetermined the orientation parameters of their principal plane in the Galaxy. Based on 299 Cepheids with heliocentric distances r < 20 kpc and pulsation periods P ≥ 5d, we have found the directions of the three principal axes of the position ellipsoid: L 1 = 281.0° ± 0.1°, B 1 = −1.9° ± 0.1°; L 2 = 11.0° ± 0.7°, B 2 = 0.2° ± 0.1°; and L 3 = 275.9° ± 0.7°, B 3 = 88.1° ± 0.1°. Thus, the line of nodes l Ω = L 3 + 90° = 5.9° is very close to the direction to the Galactic center; the Cepheid symmetry plane is inclined to the Galactic plane approximately by −2° in the direction of the first axis (L 1). The direction of the line of nodes found from old Cepheids (P <5d) differs significantly and is l Ω = 298°. The elevation of the Sun above the Galactic plane has been estimated from 365 closer stars (r < 4 kpc) without any constraint on the pulsation period to be h ⊙ = 23 ± 5 kpc. Pleiades Publishing, Inc., 2013 Galactic structure nationallicence classical Cepheids nationallicence Galactic warp nationallicence Astronomy Letters Springer US; http://www.springer-ny.com 39/11(2013-11-01), 753-758 1063-7737 39:11<753 2013 39 11443 https://doi.org/10.1134/S1063773713110029 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1134/S1063773713110029 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Bobylev V. Pulkovo Astronomical Observatory, Russian Academy of Sciences, Pulkovskoe sh. 65, 196140, St. Petersburg, Russia aut NATIONALLICENCE 773 0- Astronomy Letters Springer US; http://www.springer-ny.com 39/11(2013-11-01), 753-758 1063-7737 39:11<753 2013 39 11443 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer