The X ray transient GS2023+338: The 0d.24 and 6d.5 modulations

Casares, J.; Charles, P. A.; Pavlenko, E. P.
Bibliographical reference

In ESA, Environment Observation and Climate Modelling Through International Space Projects. Space Sciences with Particular Emphasis on High-Energy Astrophysics p 147-148 (SEE N93-23878 08-88)

Advertised on:
7
1992
Number of authors
3
IAC number of authors
0
Citations
0
Refereed citations
0
Description
High resolution spectrophotometry of the black hole system V404 Cyg during quiescence, performed during 1990 and 1991, is discussed. In addition to a 6.5d orbital modulation, there is strong evidence of a 0.24d periodicity in both the H alpha emission radial velocities and the continuum flux. The relative phasing between the photometric and spectroscopic 0.24d modulations is somewhat puzzling and several interpretations are discussed. Some hints of ellipsoidal modulation in the 6.5d period are also presented.