2. The catalogue

The catalogue here presented is essentially the result of a large effort culminated in the publication of the General Catalogue of Ap and Am Stars (Renson et al. 1991). The stars are listed in order of increasing running number in that catalogue (henceforth Rns number).
In the various columns of all three tables we give:

1.

the HD (or HDE) number, the HR (= BS) number, if any, and the running number (Rns) in the General Catalogue of Ap and Am stars (Renson et al. 1991);

2.

another name of the star, the variable star name (if any), the right ascension at the epoch 2000.0.

As far as the other name of the star is concerned, we give in order of preference: the greek letter (Bayer) or number (Flamsteed) in the constellation (for the austral constellations we give the Gould (G.) number), the GC number in the Boss (1937) catalogue, the Durchmusterung number (BD, CoD, or CpD). In case of a double star a capital letter A, B, ... is appended to specify which component is considered; the capital letter is however omitted if the other component is far away or much weaker;

3.

the spectral type and peculiarity type, the visual magnitude m_V, and the declination at the epoch 2000.0.
In the peculiarity type only the most abundant elements are considered. The abbreviation He wk means that the star belongs to the He weak subgroup. The values of the visual magnitude are generally quoted with two decimal digits; however such a precision is often illusive, especially when the luminosity variation is not very small. In case of double stars, when the angular separation of the components is only of the order of one or a few arcsec, the value found in the literature is the magnitude of the system as a whole; then a correction is applied in order to quote here the m_V value of the Ap component alone (as it has been done by Renson in the Catalogue General des Etoiles Ap et Am, in which the m_V values were however given with only one decimal digit);

4.

the most probable period (in days), the type of variability, and a if there is a remark at the end of the catalogue.
The presence of a : after the period value indicates that it is approximate, a ? indicates that it is dubious. The type of variability is indicated according to the code: : luminosity and/or color, m: magnetic field, s: spectral line intensity, v: wavelength displacements of the lines of an ion, interpreted as mean radial velocity variations for that ion;

5.

source catalogues, with the codes: 0 = main catalogue (Catalano & Renson 1984), 1 = first supplement (Catalano & Renson 1988), 2 = second supplement (Catalano et al. 1991), 3 = third supplement (Catalano et al. 1993), 4 = fourth supplement (Catalano & Renson 1997), and blank = new reference or old reference only now added;

6.

proposed values of the period (in days) with their accuracy, if available, and references. If more values are reported by an author we list them separated by the symbol / (which thus means: or). If the other values

are less probable we put them in parentheses. The presence of a : after the period value indicates that it is approximate, a ? indicates that it is dubious.

The references for the Catalogue are given at the end, together with those of the notes; the source catalogue is also indicated according to the above code.