SIMBAD references

Stroemgren uvbyβ photometry has been collected for a total of 1017 stars earlier than G0 lying in an area of the sky containing the Southern Coalsack, the Musca, and the Chamaeleon dark clouds. The targets were selected from the SAO star catalog, and the results, which are only available in electronic form at the CDS, give V, b-y, m₁, c₁, and β on the standard systems, with overall rms errors for one observation of one star of 0.008mag , 0.004mag , 0.006mag , 0.009mag , and 0.011mag , respectively. The observational data introduced here is aimed for an investigation of the colour excess distribution in direction to the mentioned dark clouds as well as to the interstellar medium surrounding them.