Abstract
A homogeneous data-base collating all uvbyβ photometry available at present for O-B9 stars in the field of IC 2602 is presented. The characteristics of the field are studied. Four spatially coherent groups can be distinguished. A low reddened compact group located at 156 ± 6 pc is identi.ed with IC 2602, followed by background layers at 546 ± 33 pc, 1117 ± 61 pc, and possibly at 2626 ± 163 pc. The apparent depth of the first three layers is about 1 kpc, which is consistent with the thickness of a spiral arm. There is an indication for the existence of a region free of massive luminous stars between 1.2 and 2.6 kpc, which could be associated with interarm space between the Local Association and the distant spiral structures toward Carina. A comparison between the photometric and Hipparcos parallaxes is presented. (© 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
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