Estimation of the Vertical Disk Scale Height Using Young Galactic
  Objects
  We have collected literature data on young Galactic objects such as masers
with VLBI-measured trigonometric parallaxes, OB associations, HII regions and
Cepheids. We have recently established that vertical disk scale height is
strongly influenced by the objects of the Local arm. In the present work we
used samples that do not contain objects in this arm. Based on the model of a
self-gravitating isothermal disk for the density distribution, we have found
the following vertical disk scale heights: h=46+/-5 pc from 69 masers with
trigonometric parallaxes, h=36+/-3 pc from 59 OB associations, h=35.6+/-2.7 pc
from 147 HII regions, h=52.1+/-1.9 pc from 195 young Cepheids, and h=72.0+/-2.3
pc from 192 old Cepheids.
