Photometric and Spectroscopic Investigation of Five Cataclysmic Variable Stars Using Tess and Lamost

This study presents a combined photometric and spectroscopic investigation of five cataclysmic variable (CV) systems, 2MASS J04132921+3116279, HQ And, V1434 TAU, SDSS J003303.94+380105.4, and SDSS J090628.24+052656.9 using data from the TESS space telescope and the LAMOST spectroscopic survey. The primary aim is to classify the nature of these CVs and assess their accretion behavior through time-series analysis and emission line diagnostics. TESS light curves were analyzed to determine orbital and superhump periods, while LAMOST spectra were used to estimate equivalent widths of key lines such as Hα, Hβ, and He II. My results identify two SU UMa-type dwarf novae (V1434 TAU and SDSS J003303.94+380105.4), one likely U Gem-type system (SDSS J090628.24+052656.9), one non-magnetic nova-like variable (HQ And), and one magnetic CV candidate (2MASS J04132921+3116279), possibly an intermediate polar or nona-like system. The combination of photometric variability and spectral features allows for detailed classification and offers insights into the mass transfer states and evolutionary status of these systems.