title: X-ray spectra from three cosmic sources.
abstract: Three cosmic x-ray sources have been observed from a water-launched rocket carrying two x-ray detectors to an altitude of 200 kilometers. The x-ray spectra, measured in the photon energy range between I and 40 kiloelectron volts, are all different. The sources in order of hardness of spectra are Cyg XR-1, Tau XR-1, and Sco XR-1. The intensity of Sco XR-J decreased at low photon energies. The differences in spectra might source mechanisms.
authors.forename: R J
authors.initials: RJ
authors.lastname: Grader
authors.forename: R W
authors.initials: RW
authors.lastname: Hill
authors.forename: F D
authors.initials: FD
authors.lastname: Seward
authors.forename: A
authors.initials: A
authors.lastname: Toor