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From: "Vitaliy Bogomolov"
Organization: SINP MSU
To: polar@xray.sai.msu.su
Date: Tue, 22 Feb 2000 12:37:28 MSK-3MSD
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Subject: BH-2000
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Dear collegues,
If it is not too late, please, include our 10 min report
into BH-2000 colloquium program:

PERIODIC PROCESSES IN HARD RADIATION OF X-RAY NOVAES: RESULTS
OF PROGNOZ_9 OBSERVATIONS AND PERSPECTIVES OF MIR-SPECTR DATA
PROCEEDING

V.V.Bogomolov, M.I.Kudriavtsev, S.I.Svertilov

Periodic components in hard X-rays (10-200 keV) from some objects
near the Galactic Center were discovered in the experiment during
Prognoz-9 mission. The period values lay in the range from several
hours to several days. 6 of 13 periodic processes were identified with
known X-ray binaries. Among them are 4 x-ray novaes: H1705-25 (Nov Oph
1977) - 152 h, GRO J1655-40 - 62 h, 4U1543-47 - 13.3 h and Cen X-4 -
8.2h., first 3 of them are BH ones. The common property of all detected
processes is the complicated form of mean light curves. The energy
spectra of periodic components are hard up to kT>40keV for 152h
periodicity. The properties of unidentified periodic components are
similar, so some of them may also have BH novae nature. The 2 year data
of hard x-ray instrument in GRIF-1 experiment onboard MIR-SPECTR gives
the future perspectives in X-ray novaes investigations.