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| HST Spectroscopy STIS/GHRS/FOS |
| STScI Analysis Newsletter No. 11, Feb. 99 |
| |
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New HST Spectroscopy STAN Format & Content
We are continuing a transition to a new format for
the HST Spectroscopy STAN. At the top, an index of
topics is listed with the web address where you can go
to get all of the details. Below this, short summaries
are provided for each topic. And as always, the STAN
will be posted on the STIS web site, where all of these
topics will be hypertext links directing you to the
full writeup. All items appearing here and more are
posted on the STIS web site, but we will only highlight
items of particular interest or importance in the STAN.
New STIS Reference Files
Discontinuities in Rectified Spectra
Offset between CCD and MAMA Coordinate Systems
Aperture Offset Angles
+-STIS------------------------------------------------+
New STIS Reference Files
Many updated reference files have been installed
in the calibration pipeline. Among them are,
the aperture throughputs for all apertures (and
corresponding photometric throughputs), photometric
correction table for new supported apertures, as well
as slitless spectroscopy, and improved cosmic ray
rejection parameters.
Discontinuities in Rectified Spectra
An error in the interpolation method used in the
rectification of spectral images has caused jumps in
flux level in the rectified spectra. This error will
be corrected in release 2.1 of CALSTIS.
Offset between CCD and MAMA Coordinate Systems
Observations of a target taken back-to-back with the
MAMAs and the CCD, and with no telescope movement
between the individual observations should have the
same world coordinates in either detector. It was
recently discovered that the postobservation
correction for the MSM deflection is currently not
applied. Therefore targets will not be centered in the
field of view, even if the target and guide star
coordinates had no errors.
Aperture Offset Angles
Each STIS aperture has a specific U3 offset angle which
is close to, but not equal to 45-degrees. Precise
offset angles for all available spectroscopic slits
are available.
+-Spectrographs---------------------------------------+
List of Recent Preprints Now on Line
The list of preprints based on HST spectrographs data
that usually occupies this space is now available at
the STIS web site for easy browsing.
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| The Space Telescope Science Institute is operated |
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