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Astron. Astrophys. 359, 635-638 (2000)

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1. Introduction

According to the Oblique Rotator Model, proposed by Babcock (1949) and Stibbs (1950), a magnetic Chemically Peculiar (CP) star consists of: a mainly dipolar magnetic field, whose axis is tilted with respect to the rotational one; non solar chemical abundances; and a non homogeneous distribution of elements on the stellar surface. In such a picture, the period of the observed magnetic, photometric and spectral variability is the stellar rotational period.

[FORMULA] Fornacis (= HD 12767= HR 612= HIP 9677) was classified as an A0 silicon star by Bidelman & Böhm (1955), its photometric variability was discovered by Renson & Manfroid (1978) and the presence of a magnetic field suggested by Babcock (1958). Measurements of the effective magnetic field were obtained by Borra & Landstreet (1980).

In the previous picture of a CP star, [FORMULA] For is also expected to present spectral variations. With the aim to determine their behaviour and relate spectral, light and magnetic variability, we have obtained time resolved spectra of [FORMULA] For.

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© European Southern Observatory (ESO) 2000

Online publication: July 7, 2000