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Optical observations of new X-ray emitting cataclysmic variables (1985)

Schwartz, D. A. ; Tuohy, I. R. ; Buckley, D. A. H. ; [et al.]

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Publication Date: 2019-06-28

Description: Two X-ray emitting cataclysmic variables were discovered as a result of a program to identify faint X-ray sources located by the HEAO-A3 modulation collimator experiment. The objects, H0534-581 and 1H0542-407, have similar high excitation spectra with intense emission lines showing broad and narrow components. Photometry shows that H0534-581 and 1H0542-407 have average magnitudes of V=14.9 and 15.7 respectively, leading to Lx/Lopt ratios of 1.5 (typical of dwarf novae in quiescence). While pronounced variability of delta B or = 1.5 mag is observed from both systems, there is no clear evidence for repeatable orbital periods between 1 and 4 hr.

Keywords: SPACE RADIATION

Type: ESA Recent Results on Cataclysmic Variables; p 73-76

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