Abstract:
We present optical photometric and spectroscopic observations of two cataclysmic variables (CVs), namely RBS
0490 and SDSS J075939.79+191417.3. The optical variations of RBS 0490 have been found to occur with a
period of 1.689 ± 0.001 hr, which appears to be the probable orbital period of the system. Present photometric
observations of SDSS J075939.79+191417.3 confirm and refine the previously determined orbital period as
3.14240928 ± 0.00000096 hr. The presence of long-duration eclipse features in the light curves of SDSS
J075939.79+191417.3 indicates that eclipses might be due to an accretion disk and bright spot. The orbital
inclination of SDSS J075939.79+191417.3 is estimated to be ∼78° using the eclipse morphology. The phased
light-curve variations during the orbital cycle of RBS 0490 provide evidence of emission from an independent
second accretion region or a second fainter pole. Optical spectra of RBS 0490 and SDSS J075939.79+191417.3
show the presence of strong Balmer and weak He II (λ4686) emission lines, along with the detection of strong Hβ
emission lines with a large equivalent width. The characteristic features of RBS 0490 seem to favor low-field
polars, while SDSS J075939.79+191417.3 appears to be similar to nonmagnetic systems.
