Photometry of the eclipsing cataclysmic variable SDSS J152419.33+220920.0⋆
Observatorio Astronómico Nacional, Instituto de Astronomía, Universidad
Nacional Autónoma de México,
Apartado Postal 877, 22830,
2 Instituto de Astronomía, Universidad Nacional Autónoma de México, Apartado Postal 70-264, México, D.F., Mexico
e-mail: email@example.com, firstname.lastname@example.org
3 School of Physics & Astronomy, University of Southampton, Highfield, Southampton SO17 1BJ, UK
Received: 11 September 2012
Accepted: 28 April 2013
Aims. We present new photometry of the faint (g ~ 19 mag) and poorly studied cataclysmic variable SDSS J152419.33+220920.0, analyze its light curve and provide an accurate ephemeris for this system.
Methods. Time-resolved CCD differential photometry was carried out using the 1.5 m and 0.84 m telescopes at the Observatorio Astronómico Nacional at San Pedro Mártir.
Results. From time-resolved photometry of the system obtained during six nights (covering more than twenty primary eclipse cycles in more than three years), we show that this binary presents a strong primary and a weak secondary modulation. Our light curve analysis shows that only two fundamental frequencies are present, corresponding to the orbital period and a modulation with twice this frequency. We determine the accurate ephemeris of the system to be HJDeclipse = 2 454 967.6750(1) + 0.06531866661(1) E. A double-hump orbital period modulation, a standing feature in several bounce-back systems at quiescence, is present at several epochs. However, we found no other evidence to support the hypothesis that this system belongs to the post-minimum orbital-period systems.
Key words: novae, cataclysmic variables / stars: individual: SDSS J152419.33+220920.0
Photometry described in Table 1 is only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (22.214.171.124) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/554/A25
© ESO, 2013