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.