Curve of Growth Analysis of SZ Lyn

TL;DR

This study combines spectroscopic and photometric data to analyze the pulsation modes and temperature variations of SZ Lyn, a Delta Scuti star in a binary system, deriving stellar parameters through curve of growth and spectral fitting.

Contribution

It provides the first detailed temperature profile and stellar parameters of SZ Lyn using high-resolution and time series spectroscopy combined with photometry.

Findings

Identified radial and non-radial pulsation modes.

Derived temperature variations over the pulsation cycle.

Estimated stellar parameters: Teff=6750 K, log(g)=3.5, vrot=10 km/s.

Abstract

We present one high-resolution and a time series of 561 low-resolution follow-up spectroscopic observations of SZ Lyn. It is a high-amplitude Delta Scuti-type pulsating star in a binary system. The photometric observations reveal the existence of radial and non-radial oscillation modes in SZ Lyn. In spectroscopy, the variation of equivalent width of the line profiles reflects the temperature variations. The equivalent widths of the Balmer lines, H-alpha, H-hbeta, and H-gamma were measured over the pulsation cycle of SZ Lyn using time sequence spectra. Hence, the temperature profile of SZ Lyn was derived using the curve of growth analysis. Furthermore, the stellar parameters were determined through the best fit analysis of observed and synthetic high-resolution spectral lines. The best fit determines a model of Teff=6750 K, log(g)=3.5 dex, and vrot=10 km/s for solar abundance.