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| GGGGGGG HH HH RRRRR SSS |
STScI | GG HH HH RR R SS | STAN - GHRS
Analysis | GG GGG HHHHHH RRRRR SS | Number 16
News | GG GG HH HH RR R SS | October 1996
| GGGGGGG HH HH RR R SSS |
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CONTENTS:
- GHRS NEWS
+ More on Throughput Changes
+ HOPRs
+ The GHRS Group
- NEW GHRS DOCUMENTATION
+ ISR-077: G270M y-Deflections and Vignetting Corrections
+ ISR-078: "Flaky" Diodes
- DATA ANALYST POSITION AVAILABLE AT STScI
- PROGRAM COORDINATOR POSITION AVAILABLE AT STSCI
- RECENT PREPRINTS
- APPENDIX : GHRS CONTACTS
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More on Throughput Changes
--------------------------
As mentioned previously, we have seen changes in the absolute throughput
of the GHRS since the 1993 Servicing Mission. Above Lyman-alpha these
changes have reached about 4% net over two years, which is less than the
uncertainty in absolute fluxes. However, below Lyman-alpha the decline
is more significant, and amounts to 30 to 40% at the shortest wavelengths.
If your observations include wavelengths below Lyman-alpha, and absolute
fluxes at those wavelengths are important for your science, please contact
us (via help@stsci.edu). A task has now been written to enable us to
determine a flux correction appropriate to the time your data were taken.
An ISR is in progress, and will be made available soon.
HOPRs
-----
You should check your spectrograph observations as soon as you possibly can
after receipt to verify that your program executed properly.
The GHRS and FOS are being withdrawn from HST at the time of the Second
Servicing Mission, now scheduled for February 13, 1997. Every effort is
being made to complete GHRS and FOS observations before that date, but
please remember that the lead time for scheduling observations, combined
with the time needed to process and implement HOPRs (HST Operations Problem
Reports) means that HOPRs need to be filed as soon as possible if there is
any hope of carrying out a repeat observation before SM2.
The GHRS Group
--------------
As STScI prepares for SM2 and the new instruments, it is necessary to
strengthen the STIS and NICMOS groups. As a result, some GHRS people
(C. Leitherer, M. McGrath, [Instrument Scientists] and A. Gonnella [Data
Analyst]) have recently switched to the STIS Group, although they retain
their responsibilities as GHRS Contact Scientists. In other words, they
will continue to monitor the progress of their GHRS programs and to check
the data received.
At present the GHRS Group consists of:
David Soderblom Group Lead soderblom@stsci.edu
Howard Lanning Instrument Scientist lanning@stsci.edu
Al Schultz Instrument Scientist schultz@stsci.edu
Lisa Sherbert Data Analyst lisa@stsci.edu
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NEW GHRS DOCUMENTATION
G270M y-Deflections and Vignetting Corrections
----------------------------------------------
An Instrument Science Report is now available about y-deflections and
vignetting corrections for grating G270M. Note that the discussion in
this ISR pertains only to wavelengths below 2300 A since longer wavelengths
have not experienced the problem discussed here. Contact help@stsci.edu for
a paper copy of GHRS-ISR-077.
"Flaky" Diodes
--------------
GHRS ISR-078 discusses what we call flaky diodes, how to identify them, and
how to correct for them. Flaky diodes manifest themselves when the GHRS
is used for very long periods that lead to relatively high internal
temperatures, especially in the pre-amp. The mechanism is not fully
understood, but the phenomenology is reasonably well delineated.
Contact help@stsci.edu for a paper copy of GHRS-ISR-078.
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Data Analyst Position Available at STScI
----------------------------------------
The Space Telescope Science Institute anticipates an opening for a
Data Analyst. Data Analysts in the Science Support Division help General
Observers and Archive Researchers analyze HST data, work with Instrument
Scientists in calibrating the HST instruments, and work with STScI staff
on grant-supported research projects. These research projects span a range
of size scales from comets and planets to the large scale structure of
the universe and a range of wavelengths from radio to X-ray astronomy.
Applicants should possess a B.S. degree in astronomy or physics, or
equivalent; experience with astronomical research; familiarity with
scientific computing; expertise in data analysis; knowledge of IRAF, IDL
or other software packages for astronomical data analysis; and programming
ability. Additional mathematical, statistical, and computer skills are
desirable. Candidates should have the ability to work with a minimum of
direction, enjoy research and possess skills to develop excellent working
relationships. Candidates should send a letter with current curriculum
vitae and the names of three references to:
Human Resources Manager
Space Telescope Science Institute
3700 San Martin Dr.
Baltimore, MD 21218
Women and minorities are strongly urged to apply. AAE/EOE.
Program Coordinator Position Available at STScI
-----------------------------------------------
The Space Telescope Science Institute anticipates an opening for a Program
Coordinator in the Project to Re-Engineer Space Telescope Observing.
Program Coordinators work, in conjunction with Contact Scientists, with
successful HST proposers helping them design observation programs at the
forefront of astronomy. Upon receiving the accepted program, the Program
Coordinators are in charge of implementing the program to fly on the
Space Telescope for execution.
The successful candidate would be a very motivated individual, with
excellent communication and organizational skills, able to work with
minimum supervision. A BA or MA in physics or astronomy and experience
with spacecraft operations or proposal implementation is very desirable.
Candidates should send a letter with current curriculum vitae and the
names of three references to:
Human Resources Manager
Space Telescope Science Institute
3700 San Martin Dr.
Baltimore, MD 21218
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RECENT PREPRINTS
----------------
We draw your attention to these papers, based on GHRS data, that will appear in
the next few months. This list includes all preprints received by the STScI
Library not yet published in the journals. Please remember to include our
Library in your preprint distribution list.
BOWEN, D.V.; TOLSTOY, E.; FERRARA, A.; BLADES, J.C.;
BRINKS, E. "The absence of diffuse gas around the dwarf
spheroidal galaxy Leo I" ApJ accepted
BOROSON, B.; VRTILEK, S.D.; MCCRAY, R.; KALLMAN, T.;
MAGASE, F. "Pulsations and line profile changes in the
ultraviolet spectrum of Hercules X-1: results from a
multiwavelength campaign" ApJ 12-20-96
FITZPATRICK, E.L. "The composition of the diffuse
interstellar medium" ApJ accepted
HOGAN, C.J.; ANDERSON, S.F.; RUGERS, M.H. "Helium
absorption by protogalactic gas" AJ
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APPENDIX: GHRS contacts
-----------------------
Any questions about the scheduling of your observations should be addressed to
your Program Coordinator. Post-Observation questions can be addressed to your
Contact Scientist.
Analysis, STSDAS or any other questions can also be addressed to help@stsci.edu.
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