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Astron. Astrophys. 347, 164-168 (1999)


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The Ap spectroscopic binary HD 59435 revisited * **

G.A. Wade  ***  1, G. Mathys[FORMULA]  2 and P. North 3

1 Astronomy Department, The University of Toronto at Mississauga, Mississauga, Ontario, Canada L5L 1C6
2 European Southern Observatory, Casilla 19001, Santiago 19, Chile
3 Institut d'Astronomie, Université de Lausanne, CH-1290 Chavannes-des-bois, Switzerland

Received 21 December 1998 / Accepted 8 April 1999

Abstract

HD 59435 is a double-lined spectroscopic binary, one component of which is a magnetic Ap star and the other a G8 or K0 giant (Wade et al. 1996). Both components are very slowly rotating, and the Ap star exhibits spectral lines resolved into their magneti cally-split components. Herein we report additional measurements of the mean magnetic field modulus of the Ap star, measurements of the radial velocities of both components, and Geneva photometry of the system, and discuss their impact upon conclusions drawn previously.

Key words: stars: binaries: spectroscopic – stars: chemically peculiar – stars: evolution – stars: individual: HD 59435 – stars: magnetic fields

* Based on observations collected at the European Southern Observatory (La Silla, Chile; ESO Programme Nos. 56.E-0688, 58.E-0159, 60.E-0565)
** Table 3 is available only in electronic form at the CDS via anonymous ftp 130.79.128.5
*** Visiting Astronomer, Canada-France-Hawaii Telescope operated by the National Research Council of Canada, the Centre National de la Recherche Scientifique de France and the University of Hawaii

Send offprint requests to: G.A. Wade, (wade@astro.utoronto.ca)

© European Southern Observatory (ESO) 1999

Online publication: June 18, 1999

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