Observational study of the extremely slow nova V1280 Scorpii

TL;DR

This study provides detailed multi-year observations of the extremely slow nova V1280 Scorpii, revealing its low-mass white dwarf and shell structures through spectral analysis.

Contribution

It offers new insights into the properties and spectral features of V1280 Scorpii, especially the use of metastable He lines to study nova shells.

Findings

V1280 Sco is an extremely slow nova.

White dwarf mass estimated at ~0.6 M_sun or lower.

Detection of blue-shifted absorption lines indicating shell structures.

Abstract

We present multi-color light curves and optical spectra of V1280 Scorpii obtained from 2007 to 2012. It is shown that V1280 Sco is the extremely slow nova and the mass of white dwarf appears to be $\sim$ 0.6 M$\odot$ or lower. Blue-shifted multiple absorption lines of Na {\sc i} D, Ca {\sc ii} HK, and He {\sc i*} are detected on high-resolution spectra. We also discuss that an approach using metastable He absorption lines is useful to investigate structures of nova shells.