KOREL
is a FORTRAN code for disentangling (i.e. a separation of component spectra
and simultaneous solution of system parameters) of spectroscopically variable
stellar systems using Fourier transform in the wavelength domain. KOREL was developed
together with the method itself by P. Hadrava on the basis of experience with
his code FOTEL (for FOTometric ELements) and inspiration by the Cross-correlation
method (that is why KOR(elation)EL(ements)).
The method was later denoted as disentangling to point out the importance of
simultaneous spectra decomposition and parameters fitting well justified
by Simon and Sturm (1994, A&A 281, 286)
for their independently developed method based on SVD in direct wavelength domain.
An alternative code fd3
for Fourier disentangling was developed by Sasa Ilijic.
The code itself is now available as a Virtual Observatory Service on
VO-KOREL web-page
of Astronomical Institute of the Czech Academy of Sciences.
A description of KOREL and related methods can be found in the document
KOREL - User's guide
in Publications of the Astronomical Institute
No. 92, pp. 15-36 (2004). An enlarged version was prepared by the author for
the First Summer School
of Disentangling. Its updated version is available in astro-ph
document "Disentangling of
spectra -- theory and practice". The disentangling was also taught
by the author at several dedicated courses at Charles University
and COMU or a
miniworkshop at ESO.
Some of the sample data for testing the run of KOREL, which are described
as exercises in the Summer-school lecturenotes, can be downloaded here:
Ex1 - KOR0801A.DAT,
KOR0801A.PAR,
KOR0801B.DAT,
KOR0801B.PAR.
Ex2 - korel2a.dat,
korel2a.par,
korel2b.dat,
korel2b.par,
korel2c.dat,
korel2c.par.
Ex3 - korel3a.dat,
korel3a.par,
prekor3.lst,
prekor3.par,
55U03870.ASC,
55U03886.ASC,
55U03935.ASC,
55U03942.ASC,
55U03954.ASC,
55U04039.ASC,
55U04059.ASC,
55U04102.ASC,
55U04149.ASC,
55U04300.ASC,
55U04562.ASC,
55U04587.ASC,
55U04698.ASC,
55U04722.ASC,
55U07435.ASC,
55U07454.ASC,
55U07579.ASC,
55U07593.ASC,
55U07624.ASC.
Exfd3 - korelfd3.dat,
korelfd3.par
A recent version of PREKOR-code can be downloaded here.
Note, please, that it is executable under DOS.
Theory of Fourier disentangling is described in a series of papers
(1995:) A&AS 114, 393,
(1997:) A&AS 122, 581,
(2001:) Astrotomography,
(Eds. H.M.J. Boffin et al.), Springer 2001, p. 261,
(2003:) ASCP 288, 149,
(2004:) ASCP 318, 86,
(2005:) Astrophys. Sp. Sc. 296, 239,
(2006:) A&A 448, 1149,
Ap&SS 304, 337,
IAUS 240, 121,
(2009:) A&A 494, 399,
A&A 507, 397.
Some examples of its use can be found in papers
(1996:) A&A 315L, 401,
(1997:) A&A 319, 867,
A&A 322, 565,
Contr.Skal.Pl. 27, 41,
(1998:) A&A 332, 909,
(1999:) A&A 345, 531,
A&A 345, 855,
(2000:) A&A 353, 1009,
IAUS, 200, p.109,
A&A 358, 553,
(2002:) ApJ 564, 260,
ApJ 574, 771,
(2003:) ApJ 587, 685,
A&A 405, 1087,
A&A 408, 611
etc.
Petr Hadrava,
Astronomical Institute of the Academy of Sciences
of the Czech Republic,
Bocni II 1401
CZ 141 31 Praha 4,
Czech Republic
e-mail: had(at)sunstel.asu.cas.cz
tlf.: +420 226 258 421;
Revised 29. 7. 2014