On the Contribution of Unresolved Galactic Stars to the Diffuse Soft X‐Ray Background

Using stellar luminosity functions derived from ROSAT data, the contributionsof Galactic stars to the diffuse X-ray background are calculated for ROSAT PSPCenergy bands. The model follows that of Guillout et al. (1996), but uses ROSATrather than {\it Einstein} data to determine the intrinsic luminositydistributions. The model adequately predicts the numbers of stellar sourcesobserved in deep ROSAT surveys. The contribution of unresolved stellar sourcesto the ROSAT All-Sky Survey at the Galactic poles is 6.85, 4.76, and 4.91$\times$ counts s$^{-1}$ arcmin$^{-2}$ in bands R12 (1/4 keV), R45(3/4 keV),and R67(1.5 keV), respectively, which is equivalent to 4.66, 31.3 and 26.9$\times10^{-14}$ ergs cm$^{-2}$ s$^{-1}$ deg$^{-2}$.Comment: 14 pages, 8 figures, accepted by Ap