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A&A Supplement series, Vol. 121, January 1997, 57 - 58

Received February 20; accepted May 9, 1996

Fourth supplement to the catalogue of observed periods of Ap stars

F.A. Catalanotex2html_wrap523 - P. Rensontex2html_wrap525

Send offprint request: F.A. Catalano

tex2html_wrap527  Istituto di Astronomia dell' Università and C.N.R.-G.N.A. Unità di Ricerca di Catania, Città Universitaria, I-95125 Catania, Italia
tex2html_wrap529  Institut d'Astrophysique, Université de Liège, Avenue de Cointe 5, B-4000 Liège, Belgium


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 (filename: DS1178.tex).

keywords: catalogs -- stars: chemically peculiar -- stars: variables: other

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