Introduction to Spectroscopy

The VISTA spectroscopy commands are:

MASH
extract a spectrum from an image by summing (mashing) adjacent image rows or columns.
SPECTROID
extract a spectrum that curves across an image (also used to map curved extraction apertures).
EXTRACT
optimal extraction of the spectra of faint or moderately faint point-sources (Horne Algorithm).
LINEID
identify lines in a wavelength calibration spectrum.
WSCALE
compute wavelength calibration solutions from identified lamp lines.
COPW
apply (copy) a wavelength scale to a spectrum.
ALIGN
re-sample a spectrum onto a linearized wavelength scale (or adjust an existing spectrum).
SKYLINE
re-calibrate wavelengths using night sky lines.
EXTINCT
correct a spectrum for atmospheric extinction.
SETUP
set the Longitude and Latitude for extinction correction
FLUXSTAR
compute flux calibration curves from observations of flux standard stars.
FLUX
apply flux calibration to a spectrum.
POLY
fit a polynomial to a spectrum.
STRETCH
expand (stretch) and spectrum into a 2-D image.
ISPLINE
interactively fit a spline to a spectrum.
ROWFIT
fit a polynomial to each row of an image.
FINDSHIFT
find relative shifts between two spectra.
FINDPEAK
find the position of a spectrum along rows or columns.
SPINDEX
measures equivalent widths at each row of an image
FQUO
fits a broadening function to Fourier quotient spectra
EXTSPEC
extract a given order from a wavelength-calibrated echelle file.
EWAVE
identify lines in an arc spectrum obtained with the Hamilton spectrograph and compute wavelength scale from line identifications