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List of keywords for spectral data
May 2005
This is a list of keywords that you might consider for spectral data. Many of them are probably inappropriate in the case of composite spectra. However, we encourage you to browse through them and think about which ones might apply to your particular HLSP.
| KEYWORD | Description |
| TARGNAME | target name (according to raw data or catalog) |
| SPECTYPE | spectra type (e.g. coaddition, resampled, composite) |
| TELESCOP | observatory (e.g. HST, IUE, ISO, ESO-VLT1) |
| INSTRUME | instrument (e.g. STIS, HRS, SWS, VINCI) |
| INSTMODE | full description of instrument setting (e.g. HRS ACCUM ECH-B) |
| APERTURE | aperture of the instrument |
| WAVECENT | central wavelength |
| (GRATING) | grating of the instrument |
| (FILTER[n]) | filters |
| (POSANGLE) | position angle |
| OBSDATE | date of observation |
| EXPSTART | start time of observation |
| EXPEND | end time of observation |
| EXPTIME | effective exposure time (seconds) |
| NAXIS | number of data axis |
| BITPIX | number of bits that represent a data value |
| NAXIS[n] | number of points on axis [n] |
| AXIS[n] | name of axis [n] |
| AUNIT[n] | unit of axis [n] |
| CRPIX[n] | pixel at axis origin |
| CRVAL[n] | value at axis origin |
| CDELT[n] | increment |
| CTYPE[n] | description of axis (array) |
| TTYPE[n] | description of axis (table) |
| CD[n]_[n] | spectrum coordinate matrix |
| MINWAVE[n] | minimum wavelength n'th order |
| MAXWAVE[n] | maximum wavelength n'th order |
| MAXFLUX | maximum flux |
| MAXFUNIT | maximum flux unit |
| CENTWAVE[n] | central wavelength n'th order |
| RESOLUTIO | spectral resolution |
| MINFLUX | minimum flux |
| MFUNIT | minimum flux unit |
| ... | data quality |
| ... | limiting S/N |
Examples for spectra headers
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