Physics
Scientific paper
Nov 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...489..272t&link_type=abstract
Astrophysical Journal v.489, p.272
Physics
42
Black Hole Physics, Stars: Novae, Cataclysmic Variables, Stars: Individual Constellation Name: Nova Muscae 1991, Stars: Oscillations, X-Rays: Stars
Scientific paper
Correlated variations in timing and spectral properties were observed near the peak of the outburst of Nova Muscae 1991 (GS 1124-683). Two regions with different spectral and timing characteristics can be distinguished in color-color and hardness-intensity diagrams. Two types of quasi-periodic oscillations (QPOs), each associated with regions in these diagrams, have been observed. Rapid flip-flop transitions sometimes occur between the regions. In one region the QPOs' centroid frequency is a strong, increasing function of X-ray intensity. Regions with similar characteristics and similar forms of QPOs were earlier found in GX 339-4 in its very high state. These two regions may turn out to be common and unique to black hole candidates in their very high state, even though they bear some similarities to the spectral branches in neutron star Z sources.
Aoki Takashi
Asai Kazumi
Dotani Tadayasu
Ebisawa Ken
Iga Sayuri
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