YY Herculis

M. Friedjung, Institut d'Astrophysique, Paris, communicates: "As part of a programme with C. C. Huang (Purple Mountain Observatory) involving observations of symbiotic stars between 810.0 and 870.0 nm, we have observed YY Her currently undergoing a bright phase (see IAUC 5819). The last observation made on 1993 June 30 can be compared with one made on 1992 June 15, all having been made with the 1.93-m telescope of the Haute Provence Observatory (+ CARELEC spectrograph; dispersion 3.3 nm/mm). The lines of the Ca II triplet (of which the two shorter-wavelength ones at least were in absorption in 1992) now appear in emission, resolved from the nearby Paschen lines. The fluxes of the latter in emission on both dates, however, do not at first sight indicate very dramatic changes since 1992."