EDP Sciences
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Volume 380, Number 2, December III 2001
Page(s) 533 - 543
Section Formation, structure and evolution of stars
DOI http://dx.doi.org/10.1051/0004-6361:20011441

A&A 380, 533-543 (2001)
DOI: 10.1051/0004-6361:20011441

The cataclysmic variable CW 1045+525: A secondary-dominated dwarf nova?

C. Tappert1, 2, J. R. Thorstensen3, W. H. Fenton3, N. Bennert4, L. Schmidtobreick5, 6 and A. Bianchini2

1  Departamento de Física y Matemáticas, Grupo de Astronomía, Universidad de Concepción, Casilla 160-C, Concepción, Chile
2  Dipartimento di Astronomia, Università di Padova, Vicolo dell'Osservatorio 2, 35122 Padova, Italy
3  Department of Physics and Astronomy, Dartmouth College, Hanover, New Hampshire, 03755 USA
4  Astronomisches Institut, Ruhr-Universität, 44780 Bochum, Germany
5  European Southern Observatory, Casilla 19001, Santiago 19, Chile
6  Osservatorio Astronómico di Padova, Vicolo dell'Osservatorio 5, 35122 Padova, Italy

(Received 12 June 2001 / Accepted 10 October 2001 )

We present spectroscopic and photometric observations of the cataclysmic variable CW 1045+525. Both the optical spectrum and the photometric lightcurve show a strong contribution of a K5V-M0V secondary. We derive an orbital period $P_{\rm orb} = 0.271278(1)$ d by measuring the radial velocities of the absorption lines of the secondary. The period and spectral type of the secondary suggest a distance of 350-700 pc. There is evidence for additional sources of line- and continuum emission, but no direct evidence of an accretion disc. We discuss several scenarios for the nature of CW 1045+525 on the basis of our results, finding a dwarf nova classification to be the most probable, although not completely satisfying, explanation for the observed characteristics.

Key words: stars: individual: CW 1045+525 -- stars: novae, cataclysmic variables -- stars: fundamental parameters -- binaries: general

Offprint request: C. Tappert, claus@gemini.cfm.udec.cl

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