NAME

       astscript-psf-select-stars - Select good stars for constructing the PSF

SYNOPSIS

       astscript-psf-select-stars [OPTIONS] image.fits

DESCRIPTION

       Build a catalogue of "good stars" that will be considered for constructing an extended and
       non parametric PSF. Here, "good stars" means that  they  don't  have  close  objects  that
       affect  it  sourrondings  and  consequently  they  are  not  contaminated. The script will
       construct a catalog of stars from reference datasets (Gaia) if the user does  not  provide
       another  one.  In addition to this, other parameters like the axis ratio are considered to
       filter the sample and select only proper stars.

   astscript-psf-select-stars options:
              Input:

       -h, --hdu=STR/INT
              HDU/Extension name of number of the input file.

       -S, --segmented=STR
              Segmentation file obtained by Segment (astsegment).

       -D, --dataset=STR
              Query dataset ("gaia --dataset=edr3", etc.).

       -r, --racolumn=STR
              Right Ascension (R.A.) column name.

       -d, --deccolumn=STR
              Declination (Dec) column name.

       -f, --field=STR
              Magnitude column name ("phot_rp_mean_mag", for Gaia).

       -p, --parallaxanderrorcolumn=STR,STR The name of the parallax column.

       -m, --magnituderange=FLT,FLT The range of magnitude.

       -Q, --minaxisratio=FLT
              Minimum axis ratio to be accepted (default to 0.9).

       -M, --mindistdeg=FLT
              Minimum distance to more bright neighbour stars.  to be accepted, in degrees.

       -c, --catalog=STR
              Catalog of stars containing: ra, dec, magnitude, parrallax, parrallax_error.

       -a, --matchaperturedeg=FLT Aperture, in pixels, to match catalogue ra and
              dec coordinates with clumps' ra and dec.

       -F, --faintmagdiff
              The difference from the faintest  star  which  the  user  will  be  determined  the
              faintest star in '--magnituderange' option.

       -b, --brightmag
              The limit for selecting wider range of bright stars.

              Output:

       -o, --output
              Output table with the object coordinates.

       -t, --tmpdir
              Directory to keep temporary files.

       -k, --keeptmp
              Keep temporal/auxiliar files.

              Operating mode:

       -h, --help
              Print this help.

       --cite BibTeX citation for this program.

       -q, --quiet
              Don't print any extra information in stdout.

       -V, --version
              Print program version.

       Mandatory  or  optional  arguments  to long options are also mandatory or optional for any
       corresponfing short options.

       GNU Astronomy Utilities home page: http://www.gnu.org/software/gnuastro/

REPORTING BUGS

       Report bugs to bug-gnuastro@gnu.org

COPYRIGHT

       Copyright © 2020-2022 Free Software Foundation, Inc.  License GPLv3+: GNU  General  public
       license version 3 or later.
       This  is free software: you are free to change and redistribute it.  There is NO WARRANTY,
       to the extent permitted by law.

       Written/developed by Sepideh Eskandarlou.

SEE ALSO

       The full documentation for astscript-psf-select-stars is maintained as a  Texinfo  manual.
       If  the  info and astscript-psf-select-stars programs are properly installed at your site,
       the command

              info astscript-psf-select-stars

       should give you access to the complete manual.