NSV 13983: A New Dwarf Nova in the Period Gap

TL;DR

This study confirms NSV 13983 as a dwarf nova within the period gap of cataclysmic variables, measuring its orbital period to be 2.76 hours through spectroscopic analysis.

Contribution

First spectroscopic confirmation of NSV 13983 as a dwarf nova in the period gap, with precise orbital period measurement.

Findings

NSV 13983 is a dwarf nova in quiescence.

Orbital period is 2.76 hours.

It is the 14th dwarf nova identified in the period gap.

Abstract

Aims. NSV 13983 is catalogued as a dwarf nova based on a reported outburst from 2005. The system has not yet been studied spectroscopically. We attempt to confirm its nature as a dwarf nova and determine its orbital period. Methods. We derive the orbital period by using time-resolved spectroscopic data to measure radial velocities. Results. The average spectrum shows evidence that the system is a dwarf nova in quiescence. The radial velocity curves derived from measurements of the spectral lines H\alpha and H\beta, show a clear modulation with a period of 2.76 h. This places NSV 13983 below the upper edge of the gap in the period distribution of cataclysmic variables, implying that it is the 14th dwarf nova in the gap.