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\noindent{\bx A COMPILATION OF CATACLYSMIC BINARIES WITH \hb
\noindent  KNOWN OR SUSPECTED ORBITAL PERIODS}
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\noindent{\it Hans Ritter and Ulrich Kolb}
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\noindent Max--Planck--Institut f\"ur Astrophysik, Karl--Schwarzschild--Strasse 1,
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D--85748 Garching, Germany
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In this chapter we present a compilation of cataclysmic binaries with known or
suspected orbital periods. The justification for restricting ourselves to this
particular subset of the known cataclysmic variables is that 1) in general these
objects are well investigated, and 2) it limits the number of objects to be dealt
with. Furthermore, a recent and comprehensive compilation of known and suspected
cataclysmic variables which provides among other things accurate coordinates and
finding charts has been given by Downes and Shara (1993) and there is no point
duplicating this excellent work.

In this compilation we present the current content (as of 1 September 1993) of the
catalogue of cataclysmic binaries, low--mass X--ray binaries and related objects
(Ritter 1984, 1987, 1990, hereafter R84, R87 and R90, respectively), however,
regarding only the cataclysmic binaries. Accordingly, this compilation provides the
equatorial coordinates, magnitudes, orbital parameters and stellar parameters of the
components and other characteristic properties of 231 cataclysmic binaries together
with a comprehensive list of references to the relevant recent literature. In
addition the compilation contains a list of recent references to published finding
charts for 218 of the 231 objects and a cross--reference list of aliases of object
designations.

The presentation of the material is essentially the same as in R84, R87 and R90,
i.e.\ the compilation consists of 1) a table section, where a few characterizing
parameters of each object are tabulated, 2) a reference section, where a selection
of recent references to the relevant literature is given, and 3) a list of recent
references to published finding charts. Note that earlier references can be found in
R84, R87, and R90. In the table section the objects are listed in sequence of
decreasing orbital period whereas in the reference sections they are listed in
lexigraphical order. The sections described so far are preceded by a separate
description section in which the quantities listed in the table section and the
corresponding abbrevitions used in the table and in the table headings are
described. The final part of this compilation consists of the ,,who's who"--section
in which frequently used aliases of the objects' designations are cross--referenced.
The organisation of this section is basically the same as in R84, R87 and R90, the
only difference being that the list of catalogue acronyms has been omitted here.
This information can be found in R84, R87 and R90. Supplementary information will be
given in the forthcoming 6$^{\rm th}$ edition of the catalogue of cataclysmic
binaries, low--mass X--ray binaries and related objects (Ritter 1994).
 
Wherever applicable we use as the standard object designation the variable name
given in the 4$^{\rm th}$ edition of the general catalogue of variable stars
(Kholopov, \et 1985a,b; 1987a) and in the name lists of variable stars (up to and
including the 71st list, Kholopov \et 1985c, 1987b, 1989; Kazarovets and Samus 1990;
Kazarovets, Samus and Goranskij 1993).

A new feature in this compilation is that we provide now limited information about
where the values given in the table section are taken from. This is done in the
following way: at the end of the reference from which a given quantity, say XYZ, was
taken, this quantity is given in parenthesis, i.e. (XYZ). The quantities for which
this is done are: the periods (ORB.PER., 2.~~PER., 3.~~PER., 4.~~PER.), the mass
ratio (M1/M2), the orbital inclination (INCL), and the masses (M1, M2). Whenever
available, the coordinates have been taken from Downes and Shara (1993).
\bs
\refs
{\bf References}

\asp{Downes, R.A., Shara, M.M.}{93}{105}{127}

Kazarovets, E.V., Samus, N.N.: 1990, {\it Inf.\ Bull.\ Variable Stars} No.\ 3530

Kazarovets, E.V., Samus, N.N., Goranskij, V.P.: 1993, {\it Inf.\ Bull.\ Variable
Stars} No.\ 3840

Kholopov, P.N., \et: 1985a, {\it General Catalogue of Variable Stars}, 4$^{\rm th}$
edition, (Moscow, Nauka), Vol.\ I

Kholopov, P.N., \et: 1985b, {\it General Catalogue of Variable Stars}, 4$^{\rm th}$
edition, (Moscow, Nauka), Vol.\ II

Kholopov, P.N., \et: 1985c, {\it Inf.\ Bull.\ Variable
Stars} No.\ 2681

Kholopov, P.N., \et: 1987a, {\it General Catalogue of Variable Stars}, 4$^{\rm th}$
edition, (Moscow, Nauka), Vol.\ III

Kholopov, P.N., \et: 1987b, {\it Inf.\ Bull.\ Variable
Stars} No.\ 3058

Kholopov, P.N., \et: 1989, {\it Inf.\ Bull.\ Variable
Stars} No.\ 3323

\aass{Ritter, H.}{84}{57}{385 \quad (R84)}

\aass{Ritter, H.}{87}{70}{335 \quad (R87)}

\aass{Ritter, H.}{90}{85}{1179 \quad (R90)}

Ritter, H.: 1994, in preparation

\endrefs

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