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Chemically peculiar stars present spectral and photometric variability with asingle period. In the oblique rotator model, the non homogeneous distributionof elements on the stellar surface is at the origin of the observed variations.As to helium weak stars, it has been suggested that photometric and helium lineequivalent width variations are out of phase. To understand the behaviour ofhelium in CP stars, we have obtained time resolved spectra of the HeI5876 Aline for a sample of 16 chemically peculiar stars in the spectral range B3 --A1 and belonging to different sub-groups. The HeI5876 A line is too weak to bemeasured in the spectra of the stars HD 24155, HD 41269, and HD 220825. Novariation of the equivalent width of the selected He line has been revealed inthe stars HD 22920, HD 24587, HD 36589, HD 49606, and HD 209515. The equivalentwidth variation of the HeI5876 A line is in phase with the photometricvariability for the stars HD 43819, HD 171247 and HD 176582. On the contrary itis out of phase for the stars HD 28843, HD 182255 and HD 223640. No clearrelation has been found for the stars HD 26571 and HD 177003.Comment: 8 pages, 9 figures. 1998, A&AS in pres

Variability of the Hei5876 Å line in early type chemically peculiar stars