This is an electronic newsletter edited by the IUE Data
Analysis Center (IUEDAC)intended to inform the numerous remote
and local users of the IUEDAC software of recent
software updates and project changes.
UPDATED IUEDAC SOFTWARE AND DOCUMENTATION
The VMS version of the IUEDAC software and database files
have been updated and are now available for distribution
in the IUE Anonymous FTP account. A new version of the VAX
VMS installation guide (INSTALL_VAX.TEX) is also available
in the same account. Users should be cautioned that the
installation procedure required for the new software has
changed slightly, primarily because IDL system variables have
replaced the use of VMS logicals for describing the IUERDAF
account structure. (Note the unix version of the updated IUEDAC
software was added to the anonymous ftp account on iuesn1 last
month.) Also available in the anonymous ftp account is a newly
revised and expanded IUEDAC Users Guide. The 132-page LaTeX
document is stored in the file GUIDE.TEX.
IUE IMAGE PROCESSING NEWS
Progress on the IUE Final Archive
The Image Processing Center is making great strides in
processing archival IUE images with the NEWSIPS software.
We have essentially completed the first set of SWP data
("Set 1" = dispersion images taken by NASA before 1990;
image numbers < 37929). In addition, we have nearly
completed processing the first set of LWP data (also
"Set 1"; image numbers < 17058). There are some
engineering and sky background images yet to process,
plus a few "problem" images (e.g. bad raw data).
The data may be obtained from the NSSDC NDADS system.
Some of the LWP images have not yet been written into
the system, but that should happen in the next
The next data set we plan to process are the SWP and
LWP low-dispersion images taken after 1990 ("Set 2").
At this time, the calibration task is working on updating
the wavelength calibration and sensitivity degradation
corrections. In addition, we are updating the database
entries for the homogeneous data and collecting the raw
images. When all these pieces are ready, we can begin
processing these data sets.
Is the one image you absolutely need a VILSPA or recent
image, which is not available? We can process a few such
images on special request. Any such processing is "unofficial"
and the data will not be archived. For details,
contact Cathy Imhoff at firstname.lastname@example.org or
What Are the Homogeneous Data?
Have you ever searched the IUE Merged Log for a particular
object and been frustrated by the various names and
coordinates used by various Guest Observers?
The IUE Project has tried to help with this problem
by defining what we call "homogeneous data" for each
image. This is a set of uniformly defined catalogs,
names, and coordinates for the various astronomical objects
observed by IUE. These were defined with the support of
the Centre de Donnees Astronomiques de Strasbourg, thus
drawing on the SIMBAD database, and VILSPA. You will find
the usual SIMBAD style entries for the homogeneous catalogs
and object names. In addition, there is a complementary
ID to add specific information (e.g. Star #13 in a cluster).
Three special catalog designations were created to accommodate
IUE data: IUE (IUE specific images such as wavecals and nulls),
ZZ (solar system objects), and MC (LMC and SMC objects).
So an observation of Jupiter's Red Spot would appear as
catalog = ZZ, homogeneous ID = JUPITER, and complementary
ID = RED SPOT.
In addition, for each object there is a unique set of
coordinates. These are helpful primarily for point-source
"fixed" objects such as stars. For observations of extended
sources such as nebulae and galaxies, the homogenous
coordinates are typically for the center of the object.
The Guest Observer-specified coordinates and the comments
in the FITS headers should be examined to determine the
exact pointing for such objects. For solar system objects,
the GO coordinates are copied over into the homogeneous
coordinates. Currently the homogeneous data are available
in the FITS headers of NEWSIPS processed data.
IUE Atlases Available
We have two very useful IUE spectral atlases available
"IUE Ultraviolet Spectral Atlas" by C.-C. Wu et al.
1991, NASA IUE Newsletter, No. 43.
Plots IUE spectra, tabulates fluxes for MK standard
"IUE Ultraviolet Spectral Atlas of Selected Astronomical
Objects" by C.-C. Wu et al. 1992, NASA Ref. Publ.
No. 1285 Plots IUE spectra, tabulates fluxes for
planets, variable stars, galaxies, etc.
If you would like a copy or two, please contact Cathy Imhoff at
email@example.com or (301) 794-1470.
IUEDAC SOFTWARE AND HARDWARE UPDATES
Recent System Changes:
2/08/95 - OpenVMS version 6.1 installed
Recent Software Changes:
27-Jan Almost all of the experimental library routines
have now been implemented. Most of the ~100 new
programs include changes for improving software
portability and should not impact users.
Included in the implementation however is a new
version of SEARCH which allows users to submit
NEWSIPS reprocessing requests.
30-Jan Minor errors were corrected in the implemented
versions of IUEFX, STPAR, and BS_INOUT.
03-Feb Faster versions of the FITS reading routines
IFITSRD, IUE3DRD, IUEATRD, and IUEARRD have been
added to the experimental library
07-FEB New experimental routines:
LORFIT - lorentzian distribution function
(compatible with WFIT)
PFIT - power law function
(compatible with WFIT)
STDSFILE - standard star database search routine
RDSTDS - extracts corrected fluxes from online
standard star spectra
BINS - new keyword for writing results to a
WEIGHT - more flexible weighting using nu flags
14-FEB New versions of the FITS reading routines IFITSRD
and IUE3DRD have been added to the experimental
library which allow reading multiple rows of a FITS
binary table extension containing variable
length array fields.
Editor: Dr. Michael Carini
Contributors: Mr. Randy Thompson
Dr. Tom Meylan
Ms. Pat Lawton
Ms. Lyla Taylor
Dr. Cathy Imhoff
Dr. Michael Carini, Science Programs, Computer Sciences Corporation.