The doppler routines are NDF-based routines for carrying out maximum entropy
based Doppler tomography.
Here is a short recipe on how to make a map from scratch. Refer to
specific help on the various commands for more information.
- First write out a molly
file containing only the spectra to be used for the map using wdopp . These spectra should cover
the line (or lines) that is (are) to be mapped but little more
(e.g. if the lines extend to 1700 km/s, then write out data between
+/- 1800 km/s or so). All spectra must be on an identical scale with
constant velocity/pixel (i.e. use vbin
within user guide ). You should
not include any spectra affected by eclipses, since these are not
accounted for in the doppler software. The continuum should have been
subtracted and you should have set the phases inside
molly. Corrections to these phases are possible later if need be. If
there is more than one cycle then it may be advantageous to bin the
spectra. Keep sufficient phase resolution to match the spectral
resolution. If FWHM spectral resolution = VSPEC, then to match in
phase at velocities of 1000 km/s say, the phase resolution must be
about 0.00023*VSPEC. So VSPEC = 80km/s then at least 50 phases around
an orbit are needed.
- Generate a start image with makimg .
- Scale the starting image with optscl .
- Iterate the image with the routine memit .
- and that's it.
Tom Marsh, Warwick, email@example.com. 22 Feb 1999.