Fast optical variability of GRO J0422+32

Details Fast optical variability of GRO J0422+32 Fast optical variability of GRO J0422+32

Jun 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apjs...92..455b&link_type=abstract

The Astrophysical Journal Supplement Series, vol. 92, no. 2, p. 455-458

Astronomy and Astrophysics

Astronomy

12

Astronomical Photometry, Astronomical Spectroscopy, Cataclysmic Variables, Gamma Ray Astronomy, Novae, Stellar Radiation, X Ray Sources, Black Holes (Astronomy), Flux (Rate), Light Curve, Visible Spectrum

Scientific paper

We present spectroscopic and photoelectric optical observations of the X-ray nova GRO J0422+32 = Nova Persei 1992 obtained with a TV spectrum scanner, UBVR photometer and soft/hardware MANIA (Multichannel Analysis of Nanoseconds Intensity Alterations) complex on the Special Astrophysical Observatory 6 m telescope and with a fast double-head photometer at the Bologna Observatory. In the early phase after discovery the spectrum of the object presented a variable continuum with intensity rising blueward and some weak emissions (H, HE, N). Photoelectric data show a modulation on a time scale of about 5 hours and stochastic flashes, probably of nonthermal origin, on a timescale from 10-20 ms to 200 s. A unique episode of fading of the object was observed on JD 2448986.52.

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