How peculiar is the "peculiar variable" DZ Crucis (Nova Cru 2003)?

TL;DR

This study uses near-infrared spectroscopy to analyze DZ Cru, initially thought to be a nova, and confirms its classification as a classical nova based on spectral features observed over 1.5 years.

Contribution

The paper provides long-term spectroscopic observations that clarify the nature of DZ Cru as a classical nova, challenging previous alternative classifications.

Findings

Spectra show emission lines characteristic of novae.

Presence of P Cygni profiles indicates outflowing material.

Spectral features confirm the nova classification.

Abstract

The variable star DZ Cru was thought to be a nova when it was discovered in eruption in 2003 August. This explanation was later challenged, however, when the first spectra of the object were reported. We present near infrared spectroscopy of DZ Cru obtained at the New Technology Telescope on 3 occasions, starting 1.5 years after outburst, with the aim of establishing the nature of the object. The spectra display H I, O I, [N I] emission lines, together with He I P Cygni lines superposed on a dust continuum. These observations suggest the "peculiar variable in Crux'' is a classical nova.