Detecting modulations in NIR light curve of intermediate polar WX Pyx
Vishal H. Joshi, N. M. Ashok and D. P. K. Banerjee

Physical Research Laboratory, Ahmedabad
E-mail: vjoshi@prl.res.in

Abstract. We present near-infrared photometric study of the intermediate polar WX Pyx. J band light curve shows a modulation at ∼ 26 minutes. This period closely matches with the white dwarf spin period determined from previous X-ray and optical observations. A peak at period 5.3 hour is seen in the periodogram of NIR light curve and we attribute this with the orbital period of the system. Our analysis indicates that the secondary star is of M2 spectral type. The distance inferred from the surface brightness of M2 type secondary is 1.53 kpc. This suggests that the WX Pyx is one of the farthest IP known yet. The mass transfer rate and the magnetic moment of the white dwarf are estimated to be (0.95 - 1.6) X 10-9 M yr-1 and (1.9 - 2.4) x 1033 g cm3 respectively. Our analysis suggests that there is a steady partial disc present around the white dwarf and hence the mode of accretion in WX Pyx is disc-fed.