Know Your Neighborhood: A Detailed Model Atmosphere Analysis of Nearby White Dwarfs

TL;DR

This paper provides a comprehensive, improved analysis of the atmospheric parameters, mass distribution, and chemical composition of nearby white dwarfs within 20 parsecs, using homogeneous spectroscopic and photometric methods.

Contribution

It offers the first detailed, volume-limited statistical model of the local white dwarf population with improved atmospheric parameters and chemical distribution analysis.

Findings

Revised catalog of white dwarfs within 20 pc.

First detailed analysis of mass distribution in a volume-limited sample.

Comprehensive chemical composition distribution of local white dwarfs.

Abstract

We present improved atmospheric parameters of nearby white dwarfs lying within 20 pc of the Sun. The aim of the current study is to obtain the best statistical model of the least-biased sample of the white dwarf population. A homogeneous analysis of the local population is performed combining detailed spectroscopic and photometric analyses based on improved model atmosphere calculations for various spectral types including DA, DB, DC, DQ, and DZ stars. The spectroscopic technique is applied to all stars in our sample for which optical spectra are available. Photometric energy distributions, when available, are also combined to trigonometric parallax measurements to derive effective temperatures, stellar radii, as well as atmospheric compositions. A revised catalog of white dwarfs in the solar neighborhood is presented. We provide, for the first time, a comprehensive analysis of the mass distribution and the chemical distribution of white dwarf stars in a volume-limited sample.