Analysis of the Z Distribution of Young Objects in the Galactic Thin Disk
Abstract
We have obtained new estimates of the Sun's distance from the symmetry plane Zo and the vertical disk scale height h using currently available data on stellar OB associations, Wolf-Rayet stars, HII regions, and Cepheids. Based on individual determinations, we have calculated the mean Zo=-16+/-2 pc. Based on the model of a self-gravitating isothermal disk for the density distribution, we have found the following vertical disk scale heights: h = 40.2+/-2.1 pc from OB associations, h = 47.8+/-3.9 pc from Wolf-Rayet stars, h=48.4+/-2.5 pc from HII regions, and h = 66.2+/-1.6 pc from Cepheids. We have estimated the surface, \sum=6 kpc^{-2}, and volume, D(Zo) = 50.6 kpc^{-3}, densities from a sample of OB associations. We have found that there could be approximately 5000 OB associations in the Galaxy.
Keywords
Cite
@article{arxiv.1511.08438,
title = {Analysis of the Z Distribution of Young Objects in the Galactic Thin Disk},
author = {V. V. Bobylev and A. T. Bajkova},
journal= {arXiv preprint arXiv:1511.08438},
year = {2016}
}
Comments
13 pages, 2 figures, 2 tables