SEARCH FOR DUST SHELLS IN W-SER BINARIES AND SIMILAR OBJECTS - IX-CASSIOPEIAE AND TX-URSAE-MAJORIS

The results of UBVRJHKLM photometry for a strongly interacting W Ser b inary (RX Gas) and an Algol-type system (TX UMa) are analyzed. The spe ctral classification of the stellar components of the binaries is made , and the sources of excess emission at wavelengths lambda lambda 3.5 and 5 mu m are analyzed. The weak excess at lambda 5 mu m are analyzed . The weak excess at lambda 5 mu m in TX UMa is shown to be associated with the emission of an ionized shell with a volume emission measure similar to 2.7 x 10(57) cm(-3). The excess at lambda lambda 3.5 and 5 mu m in RX Cas is attributable to the emission of an optically thin ci rcumstellar dust shell with a grain temperature similar to 600-700 K. The luminosity is similar to 3 x 10(33) erg s(-1), the radius of the d ust shell is similar to 4.6 x 10(14) cm, the optical depth at lambda 1 .25 mu m is similar to 10(-3), and the mass is similar to 10(23) g.