Chemical abundances of the secondary star in the neutron star X-ray binary Cygnus X-2
Chemical abundances of the secondary star in the neutron star X-ray binary Cygnus X-2
We present Utrecht Echelle Spectrograph@William Herschel Telescope high-resolution spectra of the low-mass X-ray binary (LMXB) Cygnus X-2. We have derived the stellar parameters of the secondary star using χ2 minimization procedure, and taking into account any possible veiling from the accretion disc. We determine a metallicity higher than solar ([Fe/H] …