Esposito, P.P.EspositoIsrael, G. L.G. L.Israelde Martino, D.D.de MartinoD'Elia, ValerioValerioD'EliaVerrecchia, FrancescoFrancescoVerrecchia2020-09-172020-09-172015-06-01https://hdl.handle.net/20.500.13025/4274Monthly Notices of the Royal Astronomical Society, Volume 450, Issue 2, p.1705-1715We report on the discovery of a new X-ray pulsator, Swift J201424.9+152930 (Sw J2014). Owing to its X-ray modulation at 491 s, it was discovered in a systematic search for coherent signals in the archival data of the Swift X-ray Telescope. To investigate the nature of Sw J2014, we performed multiwavelength follow-up observations with space-borne (Swift and XMM-Newton) and ground-based (the 1.5-m Loiano Telescope and the 3.6-m Telescopio Nazionale Galileo) instruments. The X-ray spectrum of Sw J2014 can be described by a hard and highly absorbed (N<SUB>H</SUB> &tilde; 5 10<SUP>22</SUP> cm<SUP>-2</SUP>) power law (Gamma &tilde; 1). The optical observations made it possible to single out the optical counterpart to this source, which displays several variable emission lines and total eclipses lasting &ap;20 min. Total eclipses of similar length were observed also in X-rays. The study of the eclipses, allowed us to infer a second periodicity of 3.44 h, which we interpret as the orbital period of a close binary system. We also found that the period has not significantly changed over a &tilde;7 yr timespan. Based on the timing signatures of Sw J2014, and its optical and X-ray spectral properties, we suggest that it is a close binary hosting an accreting magnetic white dwarf. The system is therefore a cataclysmic variable of the intermediate polar type and one of the very few showing deep eclipses.novaecataclysmic variableswhite dwarfsX-rays binariesX-rays individual Swift J201424.9+15293010.1093/mnras/stv724http://adsabs.harvard.edu/abs/2015MNRAS.450.1705E2015MNRAS.450.1705E