The multiple periods and the magnetic nature of CP Pup

TL;DR

This paper presents multi-wavelength observations of CP Pup, suggesting it is a long orbital period intermediate polar with magnetic white dwarf features, based on spectroscopic and X-ray data.

Contribution

It introduces new spectroscopic and X-ray observations supporting the classification of CP Pup as a magnetic white dwarf system with a long orbital period.

Findings

Detection of long-term binary radial velocity modulation

Identification of magnetic white dwarf features in X-ray spectra

Proposal of CP Pup as a long orbital period intermediate polar

Abstract

Fast cadence time resolved spectra taken at the CTIO-4m telescope with the RC-spectrograph during 2 consecutive nights revealed a long term modulation of the binary radial velocity. Chandra hard X-ray spectra taken with the HETGS instrument showed features typically observed in magnetic white dwarfs (WD). Here, we present the new data and suggest that CP Pup is possibly a long orbital period intermediate polar.