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Final report, NASA grant NSG-7643 from the Massachusetts Institute of Technology, the Center for Space Research
U.S. Government
Paperback. Books LLC, Reference Series 2011-10-02.
ISBN 9781234321680
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Förlagets beskrivning
Original publisher: [Washington, D.C. : National Aeronautics and Space Administration ; Springfield, Va. : National Technical Information Service, distributor, 1990] OCLC Number: ocm28282453 Subject: Astrophysics. Excerpt: ... et al. 1976; Kawai 1985; Tawaraet al. 1985; Tanet al. 1989 ). All threeburstsreacha peakediately countingrateof ~ 1100counts / see ( off scale ). A briefburst-likeevent ( or oscillation? ) imm afterthethird burstoccursduringthe " dip " in thepersistenet mission. We havealsodiscoveredtwobursts ( of typeII? ) from theRapidBursterwhicharetriangular.--0.7 see; the modulation is in shapeandwhichshowverystrongoscillationswith aperiodof nearly-100 %. The frequency of these oscillations is very similar to the QPO observed in type II bursts ( SteUa et al. 1988 ), and we suspect that the two are related. Three type II bursts from the Rapid Burster each followed by distinct oscillations in the persistent emission were recently discovered by us. The-25 see period of the oscillations decreases as the oscillations die out. We have examined bursts from 1636-53 and found there is a strong correlation between the burst duration and the spectral state ( location in the color-color diagram ); there is also a strong correlation between the spectral state and the blackbody temperature observed during the burst at the moment that the burst flux has decayed to 10 % of the Eddington flux ( T0.1 ). The correlation is striking; long bursts with durations-20 see which have relatively high values for TO. 1 ( kT0.1-1.3 keV ) exclusively occur in one part of the color-color diagram, and short bursts (-5-10 see ) which have relatively low values for TO. 1 ( kT0.1 ~ l.l-l. 25 keV ) exclusively occur in another part. Analysis of SAS-3 Data on the Eclipse Transitions of Her X-1 and Analysis of A0620-00 ( George Clark ) Our analysis of the SAS-3 data on the eclipse transitions of Her X-1 has yielded values of 2.7x109 cm for the effective scale height of the HZ Her atmosph
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Final report, NASA grant NSG-7643 from the Massachusetts Institute of Technology, the Center for Space Research
Bokrecensioner » Final report, NASA grant NSG-7643 from the Massachusetts Institute of Technology, the Center for Space Research
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