Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987ap%26ss.136..113i&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 136, no. 1, Aug. 1987, p. 113-128.
Astronomy and Astrophysics
Astrophysics
26
Astronomical Photometry, B Stars, Blue Stars, O Stars, Spiral Galaxies, Ubv Spectra, H Ii Regions, Magellanic Clouds, Radial Distribution, Size Distribution, Star Formation
Scientific paper
About 460 OB associations were selected by a comparison of the UBV plates. The UBV photographic photometry of 1944 blue stars in the associations was made. The new associations appear like cores within Humphreys and Sandage's associations. Their star content, size distribution, and mean size ≈80 pc confirm their identity with the OB associations in the Galaxy and in the Magellanic Clouds. The genuine OB associations form groups of two or more members with a length scale of 250 pc. Their boundaries were delineated independently, but they coincide with the OB associations of Humphreys and Sandage (1980). These groups represent real concentration of blue massive stars with a large age dispersion. The star complexes unify a group of associations, H II regions, and H I peak distribution. Their mean size is 570 pc. The extensive H I clouds with a mean size of 1.2 kpc contain two or more star complexes. The questions related to star formation are briefly discussed.
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