Astron. Astrophys. 352, 600-604 (1999)

4. Results

The catalogue of uvby standard stars transformed to the standard system is given in Table l. Five supergiant B-stars and one O-star are possible variables (HD 106068, 111973, 115842, 116084, 152236, and 154090A). Table 2 gives the catalogue of H standards transformed to the standard system. Figs. 1 and 2 present the D-residuals from Tables 1 and 2 as functions of indices and coordinates and . From these figures, we conclude that there are no systematic trends in the residuals, and that the photometry is indeed on the standard systems.

Fig. 1. D-residuals for the standard stars as functions of indices. The primary standards are marked with filled symbols and the secondary with asterisks. The two excluded standard stars are marked with open symbols.

Fig. 2. D-residuals for the standard stars as functions of the coordinates and . The symbols are the same as in Fig. 1.

Table 2. Catalogue of 50 standard stars (primary and secondary) on the Crawford-Mander standard system. Secondary standard stars are marked by an asterisk. Column 3 gives the internal rms error of one observation (weight 1). NN, W, and D as in Table 1. Units: 1 mag.

In Table 3, the catalogue of Strömgren uvby photometry for 127 program stars is given. Table 4 presents H photometry for 25 program stars. The uvby indices are extrapolated for 10 program stars: LS 591 (spectral type sd:O), 145, LS VI -07 3 (HD 54024), 239, 721, 1172, 1212, 1216, 1230 and 1268. LS 617 and 343 have extrapolated indices. Table 5 gives a summary of the overall internal rms errors of the photometry.

Table 5. Overall internal rms errors of one observation (weight 1) in both the instrumental systems (i-sys) and standard systems (s-sys). Results are given for both standard stars and program stars and are based on all 22 uvby and 13 nights mentioned above. Unit: 0.001 magnitudes. n is the number of residuals included in the computation. A few observations deviating more than 4 times the rms error or with airmass larger than 1.8 were excluded.

The data presented here are discussed elsewhere (Kaltcheva & Hilditch 1999).

© European Southern Observatory (ESO) 1999

Online publication: December 2, 1999
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