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Cepheid space distribution and the structure of the galaxy

Journal Article:

Abstract

On the basis of PLC relation or the PL relation by Van den Bergh and the PC relation by Dean et al. (1978), the distance of 284 galactic cepheids with photoelectric observations have been derived. The space distribution of these cepheids with 111 additional ones without photoelectric oberservations, is studied. In spite of the strong influence of the absorption matter, which makes a great number of distant cepheids unknown, a conclusion is drawn that the cepheids do not trace spiral arms with only one possible exception: the Carina arm. The cepheid z-coordinate distribution confirms the finding of Fernie (1968) that the cepheid layer is inclined towards the formal galactic plane. On the basis of cepheid space density, a number of vast star complexes are identified in which other young objects, together with cepheids fall. The existence of these complexes is explained by star formation in giant molecular clouds. The cepheid mean period increase towards the galactic centre is most probably connected with the existence of a ring between the Sun and the centre of Galaxy, with the highest density of hydrogen and the highest rate of star formation.
Authors:
Efremov, Yu N; [1]  Ivanov, G R; Nikolov, N S [2] 
  1. Moskovskij Gosudarstvennyj Univ. (USSR). Astronomical Inst.
  2. Sofia Univ. (Bulgaria). Dept. of Astronomy
Publication Date:
Apr 01, 1981
Product Type:
Journal Article
Reference Number:
AIX-12-623825; EDB-82-033550
Resource Relation:
Journal Name: Astrophys. Space Sci.; (Netherlands); Journal Volume: 75:2
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; MILKY WAY; CEPHEIDS; DENSITY; SPATIAL DISTRIBUTION; DISTRIBUTION; GALAXIES; PHYSICAL PROPERTIES; PULSATING VARIABLE STARS; STARS; VARIABLE STARS; 640105* - Astrophysics & Cosmology- Galaxies
OSTI ID:
5882377
Country of Origin:
Netherlands
Language:
English
Other Identifying Numbers:
Journal ID: CODEN: APSSB
Submitting Site:
INIS
Size:
Pages: 407-421
Announcement Date:
Sep 01, 1981

Journal Article:

Citation Formats

Efremov, Yu N, Ivanov, G R, and Nikolov, N S. Cepheid space distribution and the structure of the galaxy. Netherlands: N. p., 1981. Web. doi:10.1007/BF00648652.
Efremov, Yu N, Ivanov, G R, & Nikolov, N S. Cepheid space distribution and the structure of the galaxy. Netherlands. doi:10.1007/BF00648652.
Efremov, Yu N, Ivanov, G R, and Nikolov, N S. 1981. "Cepheid space distribution and the structure of the galaxy." Netherlands. doi:10.1007/BF00648652. https://www.osti.gov/servlets/purl/10.1007/BF00648652.
@misc{etde_5882377,
title = {Cepheid space distribution and the structure of the galaxy}
author = {Efremov, Yu N, Ivanov, G R, and Nikolov, N S}
abstractNote = {On the basis of PLC relation or the PL relation by Van den Bergh and the PC relation by Dean et al. (1978), the distance of 284 galactic cepheids with photoelectric observations have been derived. The space distribution of these cepheids with 111 additional ones without photoelectric oberservations, is studied. In spite of the strong influence of the absorption matter, which makes a great number of distant cepheids unknown, a conclusion is drawn that the cepheids do not trace spiral arms with only one possible exception: the Carina arm. The cepheid z-coordinate distribution confirms the finding of Fernie (1968) that the cepheid layer is inclined towards the formal galactic plane. On the basis of cepheid space density, a number of vast star complexes are identified in which other young objects, together with cepheids fall. The existence of these complexes is explained by star formation in giant molecular clouds. The cepheid mean period increase towards the galactic centre is most probably connected with the existence of a ring between the Sun and the centre of Galaxy, with the highest density of hydrogen and the highest rate of star formation.}
doi = {10.1007/BF00648652}
journal = {Astrophys. Space Sci.; (Netherlands)}
volume = {75:2}
journal type = {AC}
place = {Netherlands}
year = {1981}
month = {Apr}
}