A Search for Soft Stellar X-Ray Sources.

A sensitive soft X-ray survey of about one-tenth of the sky with the S-150 Galactic X-ray Mapping Experiment, flown as part of the Skylab program on July 28, 1973, revealed no evidence for soft X-ray emission from stellar sources. Soft X-ray emission from giant stars, binary stars, and most main sequence stars is unable to account for the observed low energy diffuse X-ray background if the background originates from the super-position of discrete stellar sources. But if white dwarfs and M dwarfs are as numerous as some investigators have proposed, this experiment is unable to eliminate these stars as important contributors to the diffuse X-ray background.