Introduction: In April 1985 the Prognoz 10 satellite was launched wih the sixth Czechoslovak solar X-ray photometer of the Prognoz type (RF-2P) onboard. This publication represents a brief description of the instrument and survey plots of obtained data. Similar plots have been published in the four previous books containing data from the Prognoz 5, 6, 7, 8 and 9 experiments. The Prognoz 10 satellite was launched on April 26, 1985 into the orbit of apogee of 200 315 km and perigee of 420 km, inclination of 65° and orbital period of abour 96.4 hours. The photometer was in operation till October 15, 1895.
The short-time scale spectroscopic variability of some Be stars has been mvestigated with an optical fiber spectrograph and a CCD camera. We have found on time-scale of hours and days: -1) weak changes in the Hα emission line profile of yCas; -2) changes in the structure and the intensity of the Hα emission line core and sometimes in the wings of the Hel λ 6678 of φPer; -3) no table variations in the Hel photospheric line profile λ 6678 and in the core of the Hα absorption line of o And, which do not seem correlated with the photometric period 1.57 days given by Harmanec (1984).