Non-thermal Optical Flashes of Some LMXBs

Details Non-thermal Optical Flashes of Some LMXBs Non-thermal Optical Flashes of Some LMXBs

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998tx19.confe.328b&link_type=abstract

Abstracts of the 19th Texas Symposium on Relativistic Astrophysics and Cosmology, held in Paris, France, Dec. 14-18, 1998. Eds.:

Astronomy and Astrophysics

Astrophysics

Scientific paper

We present the results of a search for ultrafast optical variability among some LMXBs at 6 m telescope of SAO (Russia) and 2 m one of CASLEO (Argentina). Observations have been carried out by the complex MANIA (Multichannel Analysis of Nanosecond Intensity Alterations) with a time resolution of 10^{-7}s. Five extremely short flares of 0.5-5 ms duration, 0.1-1 ms rise times have been detected from the X-ray Nova A0620-00. Two flares of about 0.25 s duration have been recorded from the X-ray burster MXB1735-44. They showed fine structure on time scales of about 5-6 ms. Stochastic variability was detected from the X-ray Nova GRO J0422+32 on time scales of 5 ms - 100 s, simultaneously in different pairs of UBVR bands. The brightness temperature lower limits of all flares are 10^8-1010K therefore they are caused by non-thermal processes. Comparison of the X-ray and optical fast variability of the LMXBs is carried out.

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