Understanding Systematics in ZZ Ceti Model Fitting to Enable Differential Seismology

TL;DR

This study aims to improve the understanding of systematics in ZZ Ceti star model fitting by analyzing a large, uniform spectroscopic dataset to enhance differential seismology techniques.

Contribution

It quantifies three key systematics in spectral fitting and demonstrates their consistency across the sample, aiding more accurate ZZ Ceti modeling.

Findings

Relative positions in the $ ext{log}g$-$T_{ m eff}$ plane are consistent for the systematics studied.

The survey improves data quality and uniformity for ZZ Ceti analysis.

Systematics in spectral fitting are quantifiable and stable across the sample.

Abstract

We are conducting a large spectroscopic survey of over 130 Southern ZZ Cetis with the Goodman Spectrograph on the SOAR Telescope. Because it employs a single instrument with high UV throughput, this survey will both improve the signal-to-noise of the sample of SDSS ZZ Cetis and provide a uniform dataset for model comparison. We are paying special attention to systematics in the spectral fitting and quantify three of those systematics here. We show that relative positions in the $\log{g}$-$T_{\rm eff}$ plane are consistent for these three systematics.