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\thesaurus{08(04.03.1; 08.14.2; 08.02.1)}


\title{
Catalogue of cataclysmic binaries, low--mass X--ray binaries
and related objects (Sixth edition)}

\author{Hans Ritter$^{1}$ and Ulrich Kolb$^{1,2}$} 
\institute{$^1$Max-Planck-Institut f\"{u}r Astrophysik,
	       Karl-Schwarzschild-Str.~1,
               D-85740 Garching, Germany \\ 
           $^2$Astronomy Group, University of Leicester, 
               Leicester LE1 7RH, U.K. 
}
\offprints{H.~Ritter: hsr@mpa-garching.mpg.de}
\date{Received ; accepted}

\authorrunning{Hans Ritter and Ulrich Kolb}
\titlerunning{Catalogue of CVs, LMXBs and related objects}
\maketitle
%\markboth{Catalogue of CVs, LMXBs and related objects}{Catalogue of
%CVs, LMXBs and related objects} 

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\begin{abstract}
The catalogue lists coordinates, apparent magnitudes, orbital parameters, 
stellar parameters of the components and other characteristc properties of 
318 cataclysmic binaries, 47 low--mass X--ray binaries and 49 related objects 
with known or suspected orbital periods together with a comprehensive 
selection of the relevant recent literature. In addition the catalogue 
contains a list of references to published finding charts for 394 of the 414 
objects. A cross--reference list of alias object designations concludes the 
catalogue. Literature published before 30 June 1997 has, as far as
possible, been taken into account. All tabular material is available
only in electronic form at the CDS via anonymous ftp to 
\verb+cdsarc.u-strasbg.fr (130.79.128.5)+,
or via \verb+http://cdsweb.u-strasbg.fr/Abstract.html+.

\keywords{Catalogs --- novae, cataclysmic variables --- binaries:
close}
 
\end{abstract}

\section{Preface to the 6th Edition}

Seven and a half years after the publication of the previous (5th) 
edition of the {\em Catalogue of Cataclysmic Binaries, Low--Mass X--Ray 
Binaries and Related Objects} (Ritter 1990, hereafter R90), and almost 
four years after the deadline of an updated list of cataclysmic binaries  
published in 1995 (Ritter and Kolb 1995, hereafter RK95), the amount of 
new  literature  and the number of new objects to be included have again 
grown so much that it seems worthwhile to publish an updated edition.  
The philosophy  and the  purpose of this catalogue (now in its 6th 
edition) have been outlined in the preface to the 3rd edition (Ritter 
1984, hereafter R84) and will not be repeated here. Rather let us 
briefly recall some of the developments which, over the past seven and 
a half years, have had (and still have) a major impact on this catalogue:
\begin{itemize}
\item First,  we have seen the successful launch and operation of a number 
      of satellites, e.g. of Rosat, Ginga, ASCA, EUVE, GRO, and XTE, which 
      have led to the  detection of many  new sources or even new classes of 
      compact binaries (e.g. AM Her stars and supersoft X--ray sources by 
      Rosat or EUVE, \mbox{X--ray} transients (Black Hole candidates)
      by Ginga and  
      GRO), or to new insights concerning  previously known sources (e.g. 
      the  detection of kHz X--ray oscillations in low--mass X--ray binaries 
      by XTE observations).
\item Second, we have seen the publication of {\em A Catalog and Atlas of 
      Cataclysmic Variables} by Downes and Shara (1993), and most recently 
      of its updated  2nd edition by Downes, Webbink and Shara (1997), 
      both of which are now the primary sources for accurate coordinates and 
      finding charts for cataclysmic variables. 
\item Third, since the  publication of the 5th edition of this catalogue 
      four new issues of the {\em Name List of Variable Stars} have appeared 
      (the 70th by Kazarovets and Samus (1990), the 71st by Kazarovets, 
      Samus  and  Goranskij (1993), the 72nd  by  Kazarovets and  Samus 
      (1995), and finally the 73rd by Kazarovets and  Samus (1997)). 
      These lists provide the definitive  variable names  which are also 
      used as primary names in  this catalogue.  We note in passing that 
      the catalogue  by Downes,  Webbink and  Shara (1997) does  not yet 
      include the designations provided by the 73rd {\em Name List}.
\item Fourth, we note the increasing contribution of amateur astronomers 
      in the field of  cataclysmic variables. Equipped with  CCD photometers, 
      amateur astronomers are now in a position to do photometry of moderate  
      time resolution of rather faint objects, even with telescopes of 
      rather small apertures. Such photometry is for example adequate
      to track down  
      the superhump periods of presumed  SU UMa-type stars, or to determine 
      the orbital periods of eclipsing binaries. Results of these amateur 
      activities, which can be found on the Web page of the Variable Star 
      Network (VSNET) at \verb+http://www.kusastro.kyoto-u.ac.jp/vsnet+, have 
      also been incorporated in this compilation.
\end{itemize}
Compared with the 5th edition, the number of objects listed has almost 
doubled. The current version of this catalogue provides 
tabulated data and references for 414 objects (318 cataclysmic binaries,
47 low--mass X--ray binaries and 49 related objects).

The fact that on the one hand the number of objects, the number of 
references per object and the length of the {\em Who's Who?} section are 
steadily increasing, and that on the other hand the total length of the 
catalogue must remain within acceptable limits, makes it necessary to 
drop some of the information given in previous editions. This is done 
by suppressing  essentially all those references already  given in RK95 
(for the cataclysmic variables), or in the 5th edition (R90) (for the 
other objects). Since the previous three editions (R84, Ritter 1987, 
hereafter R87, and R90) are published in an easily accessible journal, 
all the information is still available. Earlier references are only 
repeated if they are required for cross--reference (see below). 
Accordingly the 6th edition provides:       
\begin{itemize}
\item the tables for all three object classes  (cataclysmic 
      binaries, low--mass X--ray binaries and related objects) in full;
\item for each catalogued object a selection of references to the 
      literature, published either after 1 September 1993 (the deadline of 
      RK95) for cataclysmic binaries, or after 31 December 1989 (the 
      deadline of R90) for the other objects. Earlier references are 
      only included if they are needed for cross--reference, or in cases 
      where there have been few or no new publications of relevance;    
\item a list of selected references to published finding charts. 
      Additional references may be found in previous editions;                
\item the {\em Who's Who?} file, a cross--reference list of alias names of
      the objects catalogued. 
\end {itemize}
Thus the catalogue is complete and self--contained in the tables  
and in giving cross--references to alternative object designations. With
respect to the bibliography  given in the reference sections and to the
references to published finding charts it is essentially a supplement to
RK95 in the case of cataclysmic binaries, and to R90 in the case of the 
other objects.

We should also like to mention three major changes which we are introducing 
with this edition, and which, so we hope, will make the catalogue even 
more valuable:
\begin {itemize}
\item First, for better readability we now use upper and lower case 
      characters instead of upper case only as in previous editions.
\item Second, in order to save space, we have changed the style of 
      referencing. We use shorter abbreviations for the major journals 
      (e.g. ApJ instead of Astrophys. J.) and in case of references with 
      more than five authors we quote only the name of the lead author, 
      followed by ``\,et al.\,'' and the number of authors in parenthesis.
\item Third, as we have already done in RK95, we provide now limited 
      information about where the values given in the tables are taken 
      from. How this is done is explained in the {\em Introduction}.
\end{itemize}                                                                 
Every effort has been made to avoid errors and to keep the lists up to
date. Nevertheless, the authors are well aware of the fact that also 
this edition will contain errors and may be incomplete with regard to 
the criteria stated in the preface to the 3rd edition (R84). It is 
certainly  incomplete with  respect to the  references quoted. However, 
it should be stressed that no attempt has been made  to provide a 
complete bibliography. Rather, the aim is to give a selection of 
references that should allow the user to find his way through the 
literature addressing mainly the binary properties of the objects in question. 

All the tabular material contained in this catalogue is published in
electronic form only. It is available from the CDS via
anonymous ftp to \verb+cdsarc.u-strasbg.fr (130.79.128.5)+, via
\verb+http://+ \linebreak 
\verb+cdsweb.u-strasbg.fr/Abstract.html+, or from the MPA 
Web page at
\verb+http://www.mpa-garching.mpg.de/+ \linebreak
\verb+Binary/ukolb/ed6.html+.
In addition to the machine--readable version, the ps--files for a
printable stand alone version are also available at both Web sites.
 

For the current version of this catalogue, literature published before
30 June 1997 has, as far as possible, been taken into account.

\section{Introduction}

The objects listed in this catalogue are subdivided into three main
object classes, i.e. into {\bf Cataclysmic Binaries}, {\bf Low--Mass  
X--Ray Binaries} and {\bf Related Objects}. The defining 
characteristics of the three object classes used here are the 
following:                                    

\begin{description}
\item[{Cataclysmic  Binaries}]
are semi--detached binaries consisting of a white dwarf primary (or   
a white dwarf precursor) and a low--mass secondary which is filling   
its critical Roche lobe. The secondary is not necessarily 
unevolved. It may even be a highly evolved star as for example 
in the case   
of the AM CVn--type stars. A more detailed description of the main 
characteristics of these objects may be found in Warner (1995).
                                                                        
In addition, we list among the cataclysmic binaries also the 
supersoft binary X--ray sources, because these too are semi--detached 
binaries containing a white dwarf, though one in a state of sustained 
nuclear burning. More information about these objects can be found in 
Greiner (1996).

\item[Low--Mass  X--Ray Binaries]
are  semi--detached binaries consisting of either a neutron star or
a black hole primary, and a low--mass secondary which is filling its
critical Roche lobe. Observationally they are distinguished from 
the luminous, massive X--ray binaries by the following main properties:
in general the spectra of the low--mass X-ray binaries (at maximum light)
are devoid of normal stellar absorption features. The ratio of their 
X--ray to optical luminosities is much larger than unity (typically it 
ranges from $\sim 10^2$ to $\sim 10^4$). A more detailed  description of 
the main characteristics of these objects may be found in the review 
articles in Lewin, van Paradijs and van den Heuvel (1995).

\item[Related Objects]
are detached binaries consisting of either a white dwarf or a white 
dwarf precursor primary and of a low--mass secondary. The secondary 
may also be a highly evolved star. Further information may be found 
e.g. in Ritter (1986), Bond (1989), or de Kool and Ritter (1993).
                                                                        
With one possible exception (HD~49798) we do not list among the 
related objects detached binaries containing a neutron star, or,  
for the lack of known objects, a black hole. Thus we explicitly 
exclude binary radio pulsars from our compilation because these are
adequately documented elsewhere (e.g.\ in the Princeton pulsar list 
(Taylor, Manchester and Lyne 1993) and its updates, available via
anonymous ftp at \verb+pulsar.princeton.edu+).
\end{description}

\bigskip

According to the subdivision in these three object classes the catalogue
consists of three major parts, hereafter referred to as {\em catalogue 
sections}. Each of the three catalogue sections is further subdivided into 
a {\em table section}, where a few characterizing parameters of the 
object are tabulated, and into a {\em reference section}, where a 
selection of references is given. Within each of the table sections, the 
objects are listed in order of decreasing orbital period. In the 
corresponding reference section, however, the objects are listed in 
lexigraphical order.\par
                                                                        
%The quantities listed in the table section and the corresponding
%abbreviations used in the table headings are described in a separate
%{\em Description} section which precedes the three catalogue sections.
                                                                        
In contrast to the previous editions we provide now limited information 
about where the values given in the tables are taken from. This is done 
as follows:  at the end of a reference from which a given quantity, say 
{\verb+XYZ+}, was taken, this quantity is given in parenthesis, i.e. as 
{\verb+(XYZ)+}. The  quantities for which this is done are: the periods 
({\verb+Orb.Per.+}, {\verb+2.  Per.+}, {\verb+3.  Per.+}, {\verb+4.  Per.+}), 
the spectral types ({\verb+Spectr1+}, {\verb+Spectr2+), the mass ratio 
({\verb+M1/M2+}), the orbital inclination ({\verb+Incl+}), the masses 
({\verb+M1+}, {\verb+M2+}), and, where appropriate, the radii 
({\verb+R1+}, {\verb+R2+}) and the eccentricity ({\verb+e+}).

The catalogue is supplemented by a list giving references to published
{\em finding charts} of the objects. In this separate section, the
objects of all three classes are merged and listed in lexigraphical
order. The full form of abbreviated references used is given at the
end of this section.\par

Finally, the {\em Who's Who?} file contains a cross--reference list of
alias names of 
the objects catalogued. In order to keep this list short, the full list of 
alternative object names appears only once for each object and is to be 
found under the standard name used in this catalogue. If an object is 
sought under one of its alternative names, reference to the  standard 
name is given. Wherever possible the variable name given in the 4th 
edition of the {\em General Catalogue of Variable Stars} (Kholopov et al.\ 
1985a, 1985b, 1987) or in the {\em Name Lists of Variable Stars} (up to and 
including the 73rd list (Kazarovets and Samus (1997), and references 
therein) is used as the standard name here. This section includes also a 
list of references to various catalogue acronyms that appear in this 
compilation. However, references to catalogue acronyms which have already 
been given in previous editions are not repeated here. A more complete 
list of this kind may be found in {\em The First Dictionary of the 
Nomenclature of Celestial Objects} by Fernandez, Lortet and Spite (1983),
its supplements Lortet (1986a,b), and Lortet and Spite (1986), in
the {\em Second Reference Dictionary of the Nomenclature of Celestial
Objects} by Lortet, Borde and Ochsenbein (1994), or online via the CDS
at {\verb+http://vizier.u-strasbg.fr/cgi-bin/Dic+}, or from the ADC at
{\verb+http://adc.gsfc.nasa.gov/adc/+}.


\acknowledgements
We wish to thank H.--C.~Thomas for keeping us informed about the 
latest results regarding the optical identification and follow--up 
observations of new CVs from the ROSAT All Sky Survey. We also thank 
A.~King for improving the language of the manuscript, and
R.~Downes, T.~Hillwig, E.~Kuulkers, T.~Naylor, F.~Ringwald, 
C.~Tappert and R.~Wade, for reporting updates of tabulated values and 
misprints. 


\begin{thebibliography}{}

\bibitem[]{}
Bond, H.E.~1989, in: {\em Planetary Nebulae}, S.~Torres--Peimbert (ed.), 
Kluwer, Dordrecht, p.\ 251

\bibitem[]{}
de Kool, M., Ritter, H.~1993, A\&A 267, 397

\bibitem[]{}
Downes, R.A., Shara, M.M.~1993, PASP 105, 127

\bibitem[]{}
Downes, R.A., Webbink, R.F., Shara, M.M.~1997, PASP 109, 345

\bibitem[]{}
Fernandez, A., Lortet, M.-C., Spite, F.~1983, A\&AS 52(4)

\bibitem[]{}
Greiner, J.~(ed.) 1996, {\em Supersoft X-Ray Sources}, Lecture Notes in
Physics Vol.\ 472, Springer-Verlag, Berlin

\bibitem[]{}
Kazarovets, E.V., Samus, N.N.~1990, IBVS No.~3530

\bibitem[]{}
Kazarovets, E.V., Samus, N.N., Goranskij, V.P.~1993, IBVS No.~3840

\bibitem[]{}
Kazarovets, E.V., Samus, N.N.~1995, IBVS No.~4140

\bibitem[]{}
Kazarovets, E.V., Samus, N.N.~1997, IBVS No.~4471

\bibitem[]{}
Kholopov, P.N., et al.~(11 authors) 1985a, {\em General Catalogue of 
Variable Stars}, 4th edition, (Moscow, Nauka), Vol.~I

\bibitem[]{}
Kholopov, P.N., et al.~(13 authors) 1985b, {\em General Catalogue of 
Variable Stars}, 4th edition, (Moscow, Nauka), Vol.~II

\bibitem[]{}
Kholopov, P.N., et al.~(13 authors) 1987, {\em General Catalogue of 
Variable Stars}, 4th edition, (Moscow, Nauka), Vol.~III

\bibitem[]{}
Lewin, W.H.G., van Paradijs, J., van den Heuvel, E.P.J. (eds.) 1995,
{\em X--Ray Binaries}, Cambridge Astrophysics Series Vol.\ 26, 
Cambridge University Press, Cambridge

\bibitem[]{}
Lortet, M.--C.~1986a, A\&AS 64, 303 

\bibitem[]{}
Lortet, M.--C.~1986b, A\&AS 64, 325

\bibitem[]{}
Lortet, M.--C., Spite, F.~1986, A\&AS 64, 329

\bibitem[]{}
Lortet, M.--C., Borde, S., Ochsenbein, F.~1994, A\&AS 107, 193

\bibitem[]{}
Ritter, H.~1984, A\&AS 57, 385 (3rd edition, R84)

\bibitem[]{}
Ritter, H.~1986, A\&A 169, 139  

\bibitem[]{}
Ritter, H.~1987, A\&AS 70, 335 (4th edition, R87)

\bibitem[]{}
Ritter, H.~1990, A\&AS 85, 1179 (5th edition, R90)

\bibitem[]{}
Ritter, H., Kolb, U.~1995, in:~{\em X--Ray Binaries}, W. H. G. Lewin, 
     J. van Paradijs, and  E. P. J. van den Heuvel (eds.), Cambridge 
     University Press, p.\ 578 (RK 95)

\bibitem[]{}
Taylor, J.H., Manchester, R.N., Lyne, A.G.~1993, ApJS 88, 529

\bibitem[]{}
Warner, B.~1995, {\em Cataclysmic Variable Stars}, Cambridge Astrophysics 
     Series Vol.\ 28, Cambridge University Press, Cambridge

\end{thebibliography}

\end{document}
