Parameters of the Possible Companion of the Neutron Star toward the Supernova Remnant G315.4–2.30

Abstract

Based on low-resolution (\(R\approx 3000\)) spectra, we have determined some parameters of the star Gaia DR3 5877303483506681472 (\(G=19.4\) mag), the closest object to the X-ray source [GV2003]N toward the supernova remnant G315.4–2.30: its effective temperature \(T_{\textrm{eff}}=4830\) K, surface gravity log \(g=4.3\), and metallicity \(\textrm{[Fe/H]}=-0.05\). We have analyzed its radial velocity for variability and found no variations within the error limits (\(\sigma V_{\textrm{rad}}\approx 5\) km s\({}^{-1}\)). An overabundance of the elements Ca, Ti, V, and Mn has been revealed. The color excess of the star has been estimated from the intensity of diffuse interstellar bands to be \(E(B-V)=0.68\pm 0.08\). Our estimate of the photometric distance \(d=2.5\pm 0.9\) kpc points to a possible connection with the supernova remnant.