Newly Discovered Cataclysmic Variables from the INT/WFC Photometric H alpha Survey of the Northern Galactic Plane

TL;DR

This paper reports the discovery of 11 new cataclysmic variable candidates from the IPHAS survey, with detailed follow-up on three systems revealing their orbital periods and unique spectral features, expanding knowledge of CV diversity.

Contribution

It introduces 11 newly identified CV candidates from the IPHAS survey, with detailed spectroscopic and photometric follow-up on three, providing new data on their orbital periods and spectral properties.

Findings

Three CVs have measured orbital periods above the 2-3 hour gap.

One CV is an eclipsing system, enabling precise orbital characterization.

A candidate shows unusual C and N abundances, indicating high luminosity and chemical peculiarities.

Abstract

We report the discovery of 11 new cataclysmic variable (CV) candidates by the Isaac Newton Telescope (INT) Photometric H alpha Survey of the northern Galactic plane (IPHAS). Three of the systems have been the subject of further follow-up observations. For the CV candidates IPHAS J013031.90+622132.4 and IPHAS J051814.34+294113.2, time-resolved optical spectroscopy has been obtained and radial-velocity measurements of the H alpha emission-line have been used to estimate their orbital periods. A third CV candidate (IPHAS J062746.41+ 014811.3) was observed photometrically and found to be eclipsing. All three systems have orbital periods above the CV period-gap of 2-3 h. We also highlight one other system, IPHAS J025827.88+635234.9, whose spectrum distinguishes it as a likely high luminosity object with unusual C and N abundances.