rvsao. sumspec Parameters

Input Spectra [contents] [index]

spectra ""

List of file names of spectra to analyze. @filename indicates list should come from file filename. filename[range] indicates that a range of apertures in a multispec file should be processed, where range is a comma- and/or hyphen-separated list of numbers.

specnum 0

If this is nonzero and spectra contains a single file name, this is a range of spectrum numbers in a multispec file which will be cross- correlated. Wavelength dispersion information is read from the header parameter APNUMn, and velocity information is read from APVELn. In a non-multispec file, radial velocity is read from the VELOCITY header parameter.

specband 0

If this is nonzero, it is the band from the multispec file(s) specified by spectra which will be summed. Wavelength dispersion information is read from APNUMn, where n is the aperture specified by specnum or the WCS keywords. Velocity information is read from APVELn. (New in version 2.0)

specdir 0

Directory containing spectra to analyze.

fixbad no

If "yes", remove wavelength-delimited regions listed in the file specfied by badlines. (added in version 2.0)

badlines badlines.dat

File containing list of starting and stopping wavelengths in Angstroms for removal of portions of all object spectra if fixbad is yes. All information after the second wavelength is a comment field. This file is assumed to be in the directory linedir unless a complete pathname starting with "/" is specified. (added in version 2.0)

linedir "rvsao$lib/"

Directory containing line list file named by badlines. This parameter is ignored if:

• that filename contains a "/" in the first column, as it is assumed to be a full pathname,
• if there is a "/" anywhere else in the filename, as it is assumed to be a path relative to the current working directory, or
• if there is a "$" in the filename, as the part preceding the "$" is assumed to be an IRAF environment parameter (ending in "/") defining a directory.

renormin no

If true, the data spectrum is divided by its mean value before being processed. Use this on spectra which have unusual data values such as those produced by flux calibration.

Output Spectrum [contents] [index]

compobj ""

Object name for resulting composite spectrum.

compfile ""

Output file name for resulting composite spectrum.

compdir ""

Directory for output composite spectrum

nspec 1

Number of spectra in output file. If =1, the spectra are added together if a value is given for compobj. If >1, the spectra are stacked in the output file using the same dispersion function.

renormout no

If true, the data spectrum is divided by its mean value after being rebinned and having its continuum removed. This is useful if it is desired that all spectra in the sum be treated equally.

save_names yes

If true, save the names of the files summed or stacked into the output file in that files header as HISTORY lines if unshifted or shifted into the rest frame and as VSKYn keyword values if the spectra are shifted to the observation frame.

Wavelength Limits [contents] [index]

st_lambda INDEF

Starting wavelength in angstroms of portion of spectrum to correlate. If INDEF, use beginning of wavelength overlap between input spectra.

end_lambda INDEF

Ending wavelength in angstroms of portion of spectrum to correlate. If INDEF, use end of wavelength overlap between input spectra.

ncols 2048

Number of columns into which to rebin data before transforming. If it is zero, the wavelength range of the overlap between all of the input spectra is printed and no output file is written. The velocity coverage of each individual spectrum is computed after shifting to velocity, if it is set, or without shifting if velocity is INDEF).

complog no

If yes, rebin into log wavelength; otherwise, rebin into linear wavelength.

interp_mode "spline3"

Interpolation mode to use when rebinning spectra, must be "linear" or "spline3" or "poly3" or "poly5" or "sums".

normout 0.0

If 0, do not renormalize the rebinned spectrum or spectra. If nonzero, normalize the spectrum so the mean is equal to this value.

Useful Intermediate Displays [contents] [index]

spec_plot no

If yes, plots of the individual spectra are displayed. During this time the normal IRAF cursor commands are active as well as several more that are itemized below. If emission lines are chopped, before and after plots are displayed, as well as the chopped line(s).

spec_int no

If yes, pause in cursor mode after each input spectrum has been plotted.

comp_plot no

If yes, a plot of the composite spectrum is displayed after each input spectrum is added. Cursor commands are activated, and a portion of the spectrum may be viewed using the keystroke \fIz\fR at each end of the wavelength region to be viewed. Hard copies to stdplot may also be made using the \fI@\fR command.

comp_int no

If yes, pause in cursor mode after the composite spectrum has been plotted.

Continuum and Line Removal [contents] [index]

Set continuum fitting parameters in the contsum pset.

cont_remove no

Remove continuum from input spectra if not "no". If "subtract", subtract continuum. If "divide", divide by continuum. If "zerodiv", divide by continuum and subtract 1. This last should be used instead of "divide" if the file is to be cross-correlated. In version 2.0, "divide" subtracted 1; in version 2.1b15 and later, it doesn't, and the "zerodiv" option was added.

reject no

Chop out emission lines from object spectrum before adding them to the template if " yes". If EMCHOP in a spectrum file is 1, emission lines are not removed from that spectrum. If "no", emission lines are not removed.

abs_reject 100.0

Input spectrum absorption line rejection in sigma of fit

em_reject 2.0

Input spectrum emission line rejection in sigma of fit

cont_plot yes

If yes, plots of the continuum-subtracted input spectra are displayed. This is most useful for determining the appropriateness of the continuum fitting parameters set above and in contsum.

cont_add 0.0

Continuum level added to final template spectrum to keep all flux above zero, for example.

Velocity Modification [contents] [index]

velcomp INDEF

Velocity in km/sec to which to shift individual spectra. If both velcomp and zcomp are set to INDEF, the spectra are not shifted.

zcomp INDEF

Delta lambda / lambda to which to shift individual spectra. This is useful for making spectra for very distant objects and supercedes velcomp if it is not INDEF. Wavelength limits are not changed.

svel_corr "barycentric"

Spectrum velocity correction to the solar system barycenter. Set to "none" if spectrum has already been shifted or if this correction is unnecessary. If "file", BCV is used if present in the file header, or else HCV. If "hfile", the header parameter HCV is always used. If neither is found, no correction is made. If svel_corr is not set to "none", but velcomp and zcomp are INDEF, data is shifted to the barycentric velocity correction of the first spectrum, if it has one.

If "heliocentric" or "barycentric" corrections are chosen, position and time parameters are read from the spectrum data file header. DATE-OBS (date in format 'dd-mm-yy') UT (U.T. at end of exposure as 'hh:mm:ss') and UTOPEN (U.T. at start of exposure as 'hh:mm:ss') or EXPOSURE (length of exposure in seconds) are used to compute the midtime of the exposure. RA (right ascension as 'hh:mm:ss.ss'), DEC (declination as 'dd:mm:ss.ss'), and EPOCH (epoch of coordinates defaults to 1950.0) give the position of the object whose spectrum this is. SITELONG (observatory longitude as 'dd:mm:ss.ss' or degrees), SITELAT (observatory latitude as 'dd:mm:ss.ss' or degrees), and SITEELEV (observatory altitude in meters) give the observatory position.

Displaying Results [contents] [index]

nsmooth 0

If >0, the data spectrum is smoothed this many times when it is graphed.

device stdgraph

Interactive device on which to display a graphic summary of sumspec's results.

hardcopy yes

Display graphic summary of results on plotter.

plotter stdplot

Second, non-interactive device on which to plot the graphic summary of results.

logfiles STDOUT,sumspec.log

All results from SUMTEMP are recorded in these files.

Debugging [contents] [index]

debug no

If yes, values of the parameters fit to the selected peak are recorded in the log files. This is most useful for debugging. the order of the polynomial chosen to fit the continuum.

cursor ""

Graphics cursor input. When null the standard cursor is used otherwise the specified file is used.

SUMTEMP Parameters, Alphabetically

nsmooth plotter reject renormin renormout specdir spec_int specnum spec_plot spectra st_lambda svel_corr velcomp zcomp

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Last updated 23 August 2021 by Jessica Mink

[rvsao] [sumspec]