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The Carina Spiral Feature: Strömgren-Hβ photometry approach. I. The photometric data-base
A data-base collating all uvbybeta photometry available at present forO-B9 stars brighter than 10th visual magnitude in the field of theCarina Spiral Feature is presented. The completeness and homogeneity ofthe data-base are discussed.Based on CDS data.Table 1 is only available in electronic form at the CDS via anonymousftp to cdsarc.u-strasbg.fr (130.79.128.5) or viahttp://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/410/523
| Experiments with CP stars
A method for fine-classification of stars is applied to a sample ofabout 100 stars within the approximate spectral type range B6-A5.Experiments have been performed to find a method for fine-classificationof A stars, both normal and chemically peculiar, within the MK system.It is found that, independent of the definition of the degree ofpeculiarity, no sharp border exists separating the CP stars from thenormal ones. It is also shown that spectral classification can, onaverage, be performed with almost the same accuracy for CP stars as forthe normal ones if cases of extreme peculiarity are avoided.
| A study of the open cluster NGC 6475 (M 7) (and two other stellar clusterings)
The open cluster NGC 6475 has been investigated with respect to possiblephysical properties common for its members and hence useful fordiscrimination purposes. As comparison objects two loose clusterings ofA-type stars in the southern Milky Way were used. The investigationincludes studies of both intermediate-dispersion spectra (20 A/mm) andUBV photometry. The general impression is that the high frequency ofmultiple stars, visual as well as spectroscopic, will constitute a veryserious obstacle as far as physical discrimination of cluster members isconcerned and to a large extent also in the case of other studies. TheCP stars appearing in NGC 6475 have also been subject to somediscussion. If continued investigations should prove multiplicity amongcluster stars to be considerably less frequent than in the presentcases, a membership criterion might be fruitful. Otherwise it probablyhas to be abandoned.
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