Introduction

MWC560 (V694 Mon) is a unique object that has been given both an extensive spectroscopic and photometric study for the last few years. The object has been ascertained to be a binary system from the symbiotic group: a red giant and a white dwarf in a common rarefied envelope. The spectral class of the giant is M4-6 III (Meier et al., 1996; Zhekov et al., 1996). The dwarf is surrounded by an accretion disk, both being in a dense envelope -- a pseudo-photosphere, which corresponds in colour to a star of B5-A0 (Zhekov et al., 1996).

Matter outflows along the accretion disk axis, however, we see only one of the jets because the plane of the accretion disk and of the orbits are viewed face-on (Tomov and Kolev, 1997). The period of mutual revolution of the system's companions estimated from the regular light variations (since 1990 between $V\approx9.1^m$ and 10.6^m) is close to 2000 days (Doroshenko et al., 1993; Tomov et al., 1996). The radiation of MWC 560 is chiefly produced by the pseudo-photosphere (the continuum with blue-shifted absorption lines of the jet) and the envelope (emission lines). The contribution of the M giant is insignificant. It grows, naturally, with wavelength and becomes more pronounced in the years of low light of the system.

By the present time only one atlas of the MWC 560 spectrum has been available. It has been made from spectrograms of the coude spectrograph of the 2 m telescope of the Rozhen Observatory (Bulgaria) for the region 3600-4900 Å (Kolev and Tomov, 1993). The present paper may serve as its extension to the red region of the spectrum up to 6600 Å. It is based on CCD spectra obtained at the 6 m telescope.