COMMUNICATIONS / MITTEILUNGEN
Distribution of Stars of Spectral Types Earlier than F7 around IC 4665
No. 82
Budapest, 1982
Abstract
A study was made of the spatial distribution of early type stars in a region
of intermediate galactic latitude. Objective prism plates were used to survey
an area of 19.5 sq. degree around the cluster IC 4665 for all stars of
spectral types earlier than F7 down to 12.5 photographic magnitude. 427 stars
were detected, for which spectral types and photographic UBV colours were
obtained. Different amounts of interstellar reddening were derived for the
l<30deg and l>30deg parts of the region. Separate absorption correction was made
for each of the stars. The stars were divided into four groups: spectral type
A1 and earlier, A2 - A7, A8 - F2 and F3 - F7, and the space densities were
determined for each group. The shape of the space density curve of the A2 -
A7 stars reveals the existence of two kinematic subgroups. The velocity
dispersions characterizing these two subsystems have a ratio of 1:1.6. The
interpretation of space density curves of stars earlier than A2 in terms of
such subgroups faces difficulties because of the possible photometric
distance scale error and the interference with the Gould belt.
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