Ground-based observations of the ZZ Ceti star HS 1625+1231

TL;DR

This study presents detailed photometric analysis of the ZZ Ceti star HS 1625+1231, identifying pulsation modes, performing preliminary asteroseismic modeling, and comparing seismic and Gaia distances to constrain stellar parameters.

Contribution

It provides the first detailed light curve analysis and asteroseismic investigation of HS 1625+1231, identifying pulsation modes and estimating stellar parameters using combined observational data.

Findings

Detected 11 significant pulsation frequencies.

Identified 6 independent pulsation modes in 514-881 s range.

Estimated stellar parameters with $T_{eff}$ = 11,000 K and $M_*$ = 0.60 $M_{\odot}$.

Abstract

We present the results of our detailed light curve analysis of the ZZ Ceti star HS 1625+1231. We collected photometric time series data at Konkoly Observatory on 14 nights, and performed Fourier analysis of these data sets. We detected 11 significant frequencies, where six of them are found to be independent pulsation modes in the 514 - 881 s period range. By utilising these frequencies, we performed preliminary asteroseismic investigations to give constraints on the main physical parameters, and to derive seismic distances for the star. Finally, we compared the astrometric distance provided by the Gaia EDR3 data with those seismic distances. Our selected model, considering both the spectroscopic measurements and the distance value provided by Gaia, has $T_{eff}$ = 11 000 K and $M_*$ = 0.60 $M_{\odot}$.