Pierre Renson

Catalogue of Ap, HgMn and Am stars

We present a catalogue of 8205 known or suspected Ap, HgMn and Am stars. This paper is a major update of our first edition of the catalog of Ap and Am stars and includes revised identifications, additional stars and revised information obtained from the literature.

Fifth supplement to the catalogue of observed periods of Ap stars

New data on the periods of Ap stars with references are presented (Table 1). 21 further stars are introduced for which a periodic variability has recently been discovered or for which it was known before but it was not reported in previous issues of this catalogue. For many stars also present in previous issues of the catalogue new determinations of the periods are given. Recently attributed variable star names are also quoted. Table 1, notes to this Table and related references are only available in LaTEX form at the CDS via anonymous ftp 130.79.128.5 (filename: DS1178.tex).

Thermodynamic properties of the mono-atomic linear chain

Abstract The analytical and numerical study of the thermodynamic properties of a regular mono-atomic linear chain leads to a criticism of Blackmans results concerning the specific heat curve and the Debye temperature; it further brings useful mathematical informations for the study of the same properties of a disordered isotopic linear chain.

On the classification of leptons

Abstract The formulae giving the electric charge and the neutrinonic charge in terms of T3 and S are generalized in order to apply them to leptons. These remains an unknown parameter. For a particular value of this parameter these formulae assume the particularly symmetric forms (15) and (16). Values for S, T and T3 are assigned to the different leptons. At the time this investigation was carried out the following difficulty arose: in addition to the known leptons (neutrino, electron and muon) there remained a vacancy for an undiscovered lepton, which, with regard to the charges, is similar to the neutrino. Yet this has no longer to be considered as a difficulty but well as a prediction of the theory since one was recently led to admit the existence of two neutral leptons instead of one, namely the neutrino.