Followup Observations of SDSS and CRTS Candidate Cataclysmic Variables

TL;DR

This study presents photometric and spectroscopic observations of 35 candidate cataclysmic variables, revealing their orbital periods, accretion behaviors, and classifications, including identifying a Polar candidate and confirming dwarf novae.

Contribution

It provides new observational data on candidate CVs, including orbital periods, accretion states, and classifications, enhancing understanding of their properties and behaviors.

Findings

Orbital periods range from 76 to 100 minutes.

Identification of a likely Polar with HeII line and velocity amplitude.

Confirmation of dwarf novae nature for several objects.

Abstract

We present photometry of 11 and spectroscopy of 35 potential cataclysmic variables from the Sloan Digital Sky Survey, the Catalina Real-Time Transient Survey and vsnet-alerts. The photometry results include quasi-periodic oscillations during the decline of V1363 Cyg, nightly accretion changes in the likely Polar (AM Herculis binary) SDSS J1344+20, eclipses in SDSS J2141+05 with an orbital period of 76+/-2 min, and possible eclipses in SDSS J2158+09 at an orbital period near 100 min. Time-resolved spectra reveal short orbital periods near 80 min for SDSS J0206+20, 85 min for SDSS J1502+33, and near 100 min for CSS J0015+26, RXS J0150+37, SDSS J1132+62, SDSS J2154+15 and SDSS J2158+09. The prominent HeII line and velocity amplitude of SDSS J2154+15 are consistent with a Polar nature for this object, while the lack of this line and a low velocity amplitude argue against this classification for RXS J0150+37. Single spectra of 10 objects were obtained near outburst and the rest near quiescence, confirming the dwarf novae nature of these objects.