Reprocessing of hard X-ray emission in X-ray novae

C. R. Shrader, R. M. Wagner, R. M. Hjellming, Sumner Starrfield

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


Much of the visual and ultraviolet luminosity in X-ray novae is likely to result from reprocessing of X-rays illuminating an accretion disk. During the initial stages of its 1992 outburst, GRO J0422+32 exhibited short-time-scale flickering intense enough to be seen in the individual BATSE LAD detectors with a nominal 1-second time resolution. We obtained photometry with continuous minute sampling during this period, in which short-time-scale flickering as well as hourly trends are evident. In addition, we obtained resolution spectroscopy sampled at 10-minute intervals over a baselines comparable to a binary orbital period. We present results of cross-correlation analysis between the optical and hard X-ray of time-series data sets. No statistically significant time lags can be established. For the more recent X-ray nova GRO 1655 40, we have spectra obtained on separate nights within one weeks time, bracketing an upturn in the BATSE light curve, which exhibited dramatic evolution.

Original languageEnglish (US)
Pages (from-to)261-263
Number of pages3
JournalAstronomy and Astrophysics Supplement Series
Issue number4
StatePublished - Dec 1 1996


  • Accretion
  • Accretion disks x-rays
  • Individual (GRO J0422+32, GRO J1655 40)
  • Stars -novae - Stars

ASJC Scopus subject areas

  • General Physics and Astronomy


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