Physics
Scientific paper
Jan 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982cokon..82..141p&link_type=abstract
Communications of the Konkoly Observatory, No. 82 (Vol. IX, 3), p. 141-166 (1982)
Physics
Scientific paper
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 1<30o and l>30o 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.
Balazs Lajos G.
Paparo Margit
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