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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
| Collinder 223 - A moderately young open cluster in the Carina spiral feature
UBV photoelectric data for 110 stars and DDO data for seven stars arediscussed originating in the field of the previously unstudied opencluster Collinder 223. These data show that Cr 223 is a genuine opencluster located at a distance of (2900 + or - 270) pc from the sun and96 pc below the galactic plane. Nearly 40 percent of the sample stars -including one red giant, two blue stragglers, and two suspectedvariables - are found to be cluster members. The reddening across thecluster is not uniform, the mean value being E(B-V) = 0.26 + or - 0.03(s.d.). An age of 3.6 x 10 to the 7th yr has been derived, which placesCr 223 within the IC 4665 age group.
| Broad-band photometry of selected southern ultraviolet-bright stars.
Not Available
| UVBY H-beta photometry of UV-bright stars
uvby H-beta photometry is presented for 90 stars taken from an earlyversion of the Carnochan and Wilson (1983) catalogue of stars that havevery negative UV colors. Two have definite UV excesses (HD 36629, and HD81307). Four early-B stars have UV colors too positive for their visibleclassification, and beta-indices that indicate higher luminosities thanappear possible on galactic distribution grounds. Six late-B starsappear to have discordant flux distributions for which there are noobvious explanations. It is suggested that the high population ofsubluminous stars derived by Carnochan and Wilson is the product of thestatistical treatment used and the extreme patchiness in theinterstellar absorption, which gives rise to large numbers oflittle-reddened stars.
| A survey of ultraviolet objects
An all-sky survey of ultraviolet objects is presented together with astatistical analysis that leads to the conclusion that there is asignificantly higher population of hot subdwarfs lying below themain-sequence than hitherto thought. The distribution of all ultravioletobjects, main sequence ultraviolet objects, and MK unclassifiedultraviolet objects are shown in galactic coordinates, and the absolutemagnitudes and color-color diagrams for these groups are presented.Scale heights are derived, giving values similar to planetary nebulaefor the hottest groups.
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