Hot Degenerates in the MCT Survey. III. A Sample of White Dwarf Stars in the Southern Hemisphere

TL;DR

This paper presents optical spectra and atmospheric analysis of 144 white dwarfs from the MCT survey, aiming to confirm Gaia candidates in the southern hemisphere and providing data for further research.

Contribution

It provides a comprehensive spectroscopic dataset and analysis of southern hemisphere white dwarfs, supporting Gaia survey confirmation efforts.

Findings

Spectroscopic classifications of 144 white dwarfs.

Atmospheric parameters derived for all objects.

Spectra made publicly available in the Montreal White Dwarf Database.

Abstract

We present optical spectra of 144 white dwarfs detected in the Montreal-Cambridge-Tololo (MCT) colorimetric survey, including 120 DA, 12 DB, 4 DO, 1 DQ, and 7 DC stars. We also perform a model atmosphere analysis of all objects in our sample using the so-called spectroscopic technique, or the photometric technique in the case of DC white dwarfs. The main objective of this paper is to contribute to the ongoing effort of confirming spectroscopically all white dwarf candidates in the Gaia survey, in particular in the southern hemisphere. All our spectra are made available in the Montreal White Dwarf Database.