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Astron. Astrophys. 325, 529-534 (1997)

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Spectroscopic changes of the magnetic CP star [FORMULA]  Equulei *

G. Scholz 1, G. Hildebrandt 1, H. Lehmann 2 and Yu. V. Glagolevskij 3

1 Astrophysikalisches Institut Potsdam, Telegrafenberg A31, D-14473 Potsdam, Germany (gscholz@aip.de, ghildebrandt@aip.de)
2 Thüringer Landessternwarte Tautenburg, Karl-Schwarzschild-Observatorium, D-07778 Tautenburg,Germany (lehm@tls-tautenburg.de)
3 Special Astrophysical Observatory of Russian AS, Nizhnij Arkhyz 357147, Russia (glagol@sao.stavropol.su)

Received 12 February 1997 / Accepted 28 March 1997

Abstract

From an analysis of some new spectroscopic observations of the magnetic CP star [FORMULA]  Equ we derived an effective magnetic field of [FORMULA]  G and a surface magnetic field of 4000 G. The magnitude of the effective field is compatible with a variation of the field on a time scale of a little more than 70 years. The temporal behaviour of the magnetic field is explained by the superposition of a dipole and quadrupole and the model of the oblique rotator. Surprisingly a few radial velocity values differ from the expected ones by about 10 km/s.

Key words: stars: chemically peculiar – stars: individual: fl Equ – stars: magnetic fields – stars: rotation

* Based on spectroscopical observations taken with the 2 m Telescope at the Karl-Schwarzschild-Observatorium Tautenburg, Germany, the 2.2 m Telescope on Calar Alto, Spain, and the 6 m Telescope in SAO, Russia

Send offprint requests to: G. Scholz

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© European Southern Observatory (ESO) 1997

Online publication: April 28, 1998

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