In Table 5 we present a catalogue of spectral types for
the cool components in symbiotic systems. The catalogue is mainly based
on our classifications described in the previous Section.
For those objects where we found different spectral types for
different observations, we entered in Table 5 the "average''.
For objects not covered by our own observations we adopt published
spectral types when available. We believe most literature
classification to be less accurate than our own, the exceptions
being the spectral types from Schulte-Ladbeck (1988) and
Kenyon & Fernández-Castro (1987) (see the discussion in
Sect. 3.2). The catalogue contains 179 entries, of which
172 objects have a spectral classification for the cool giant.
In this work, we classified 97 objects, many for the first time.
The catalogue includes the following objects:
The catalogue gives also the classification into s-, d-, and d-types according to the IR colors (see Webster & Allen 1975; Allen 1982). The s-types show in the IR a normal continuum of a cool giant, while d- and d-types show strong dust emission. The s-types contain non-variable red giants and typically have binary periods of years. d-type systems probably all contain a mira variable as cool component and have probably very long orbital periods P>20 yr. The d-types have several special properties, the most conspicuous of which is the presence of a F- to early K-type giant instead of a cooler star.
The IR classifications given in Table 5 are adopted from Allen (1984), Mikoajewska et al. (1997), and Mürset et al. (1996), with a few exceptions: V417 Cen was classified d by Van Winckel et al. (1994). He2-147 is of type d according to Whitelock (1987). Hen1591 is classified as d-type by Allen (1984); however, in view of the early spectral type d seems to be more appropriate. In the catalogue there are 133 s-types, 30 d-types, 7 d-types and 9 objects with no IR classification.
Copyright The European Southern Observatory (ESO)