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- W2115583635 abstract "We review the results of the 1988 multi-wavelength campaign on the late-type eclipsing binary YY Geminorum. Observations include: broad-band optical and near infra-red photometry, simultaneous optical and ultraviolet (IUE) spectroscopy, X-ray (Ginga) and radio (VLA) data. From models fitted to the optical light curves, fundamental physical parameters have been determined together with evidence for transient maculations (spots) located near quadrature longitudes and intermediate latitudes. Eclipses were observed at optical, ultraviolet and radio wavelengths. Significant drops in 6cm radio emission near the phases of both primary and secondary eclipse indicate relatively compact radio emitting volumes that may lie between the binary components. IUE observations during secondary eclipse are indicative of a uniform chromosphere saturated with MgII plage-type emission and an extended volume of Ly$alpha$ emission. Profile fitting of high-dispersion H alpha spectra confirms the chromospheric saturation and indicates significant H$alpha$ opacity to heights of a few percent of the photospheric radius. There is evidence for an enhanced H alpha emission region visible near phase 0.25-0.35 which may be associated with a large spot on the primary and with two small optical flares which were also observed at other wavelengths: one in microwave radiation and the other in X-rays. For both flares, L_X/L_opt is consistent with energy release in closed magnetic structures." @default.
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- W2115583635 date "2014-12-11" @default.
- W2115583635 modified "2023-10-16" @default.
- W2115583635 title "A multiwavelength study of the M dwarf binary YY Geminorum" @default.
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- W2115583635 doi "https://doi.org/10.1093/mnras/stu2398" @default.
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