Abstract. We present a new version of the uvbyβ catalogue. The survey of the literature is complete to the end of 1996 and 63313 stars are included in this version. This represents 36683 new measurements. New precepts have been used to compute mean values.

Abstract. We describe the new version of the General Catalogue of Photometric Data. Our database of photometric photoelectric data has been updated and completely rebuilt. Most collections contain the data published to the end of 1995, taken from more than 2500 papers. We have updated the Master Index which now contains information for over 207500 stars and components. Public access to the data is provided through the World Wide Web at http://obswww.unige.ch/gcpd/gcpd.html. A connection has been established with the ADS Abstract Service which allows to retrieve data directly from the ADS output pages.

Abstract.We have reconsidered the calibration of various color indices in terms of the effective temperature. In addition, a new calibration of the Geneva system in terms of Teff, log g and [M/H] is presented.

Abstract. We publish here the second part of our spectroscopic survey at high dispersion of some known and suspected λ Bootis stars with a view to detecting circumstellar shell features. Eight stars of our sample exhibit such features. These stars are fast rotators, a result which is in line with Hohlweger and Rentzsch-Holm's study (1995). The analysis of the photometric data has allowed us to confirm the exclusion of a few stars misclassified from the λ Bootis group.

No abstract