Adassuriya, Janaka ; Ganesh, Shashikiran ; De Cat, Peter ; Joshi, Santosh ; Jayaratne, Chandana

in press to Bulletin de la Société Royale des Sciences de Liège, 93 (2024)

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 δ 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, Hα, Hβ, and Hγ 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^{−1} for solar abundance.

Keyword(s): Curve of growth ; Equivalent width ; Temperature profile ; Pulsating stars ; SZ Lyn
Funding: BL/33/IN12 (BINA)