Abstract

AVILES, A. et al. A NA New Non-Eclipsing CV SDSSJ122405.58+184102.7 - A Probable Member to the SW Sextantis Type Stars. Rev. mex. astron. astrofis [online]. 2020, vol.56, n.1, pp.11-18.  Epub Mar 19, 2021. ISSN 0185-1101.  https://doi.org/10.22201/ia.01851101p.2020.56.01.03.

We present observational evidence that helps classify the non-eclipsing binary system SDSSJ 122405.58+184102.7 as a new member of the SW Sextantis (SW Sex) class. First, from the analysis of the optical light curve, we identify the presence of two periodic signals that develop on different time scales. The first one is the orbital period of 0.167811(1) days (= 4.027464 (3) h) and the second one is the white dwarf spin period of 28.6 minutes. This second period is probably the first evidence for the presence of a magnetic white dwarf in the system. The second evidence is the presence of the HeII λ4886 emission line in its optical spectrum. In this work we interpret the detected periodicities within the context of a magnetic accretion model for SW Sex stars.

Keywords : binaries: general; novae; cataclysmic variables; stars: individual; SDSSJ 122405.58+184102.7.