EDP Sciences
Free access
Issue A&A
Volume 431, Number 1, February III 2005
Page(s) 289 - 296
Section Stellar structure and evolution
DOI http://dx.doi.org/10.1051/0004-6361:20041112



A&A 431, 289-296 (2005)
DOI: 10.1051/0004-6361:20041112

Time-resolved photometry of the nova remnants DM Gem , CP Lac GI Mon , V400 Per , CT Ser and XX Tau

P. Rodríguez-Gil1, 2 and M. A. P. Torres3, 4

1  Department of Physics, University of Warwick, Coventry CV4 7AL, UK
    e-mail: Pablo.Rodriguez-Gil@warwick.ac.uk
2  Instituto de Astrofísica de Canarias, Vía Láctea, s/n, La Laguna, 38205 Santa Cruz de Tenerife, Spain
3  Harvard-Smithsonian Center for Astrophysics, 60 Garden St, Cambridge, MA 02138, USA
4  Physics Department, University College, Cork, Ireland

(Received 16 April 2004 / Accepted 7 October 2004)

Abstract
We present the first results of a photometric survey of poorly studied nova remnants in the Northern Hemisphere. The main results are as follows: DM Gem shows a modulation at 0.123 d (probably linked to the orbit) and rapid variations at $\sim $22 min. A moderate resolution spectrum taken at the time of the photometric observations shows intense He II  $\lambda$4686 and Bowen emission, characteristic of an intermediate polar or a SW Sex star. Variability at 0.127 d and intense flickering (or quasi-periodic oscillations) are the main features of the light curve of CP Lac . A 0.1-mag dip lasting for $\sim $45 min is observed in GI Mon , which could be an eclipse. A clear modulation (probably related to the orbital motion) either at 0.179 d or 0.152 d is observed in the B-band light curve of V400 Per . The results for CT Ser point to an orbital period close to 0.16 d. Intense flickering is also characteristic of this old nova. Finally, XX Tau shows a possible periodic signal near 0.14 d and displays fast variability at $\sim $24 min. Its brightness seems to be modulated at $\sim $5 d. We relate this long periodicity to the motion of an eccentric/tilted accretion disc in the binary.


Key words: accretion, accretion discs -- stars: binaries: close -- novae, cataclysmic variables

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Editor-in-Chief: T. Forveille
Letters Editor-in-Chief: J. Alves
Managing Editor: C. Bertout

ISSN: 0004-6361 ; e-ISSN: 1432-0746
Frequency: 12 volumes per year
Published by: EDP Sciences

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