Dutch ISO Data Analysis Centre report

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					                                                                    Doc: DIDAC/1999/04
 Report 1999/Q2                                                     Date: 25 June, 1999

      Dutch ISO Data Analysis Centre report; 1999/Q2

1 Management
The DIDAC User's meeting were revived at the end of April. It was decided that we
would meet once a month to discuss data reduction topics, DIDAC News and hear a
short science presentation.

1.1   Personnel
We are currently looking into the possibilities of getting a (part time) replacement for
Boxhoorn to take up responsibility for the archive maintenance and further

1.2   Travel
The following trips were made or are planned by DIDAC (-related) personnel for work
directly related to ISO/SWS instrument and calibration issues;

Who                      When                   Where     Why
Lahuis                   19/4/99-7/5/99         VILSPA    IDC work, spectral matching
                                                          WG, transients WG
Kester                   29/4/99-9/5/99         VILSPA    transients WG, IDC work
Shipman                  20/5/99                Leuven    RSRF/FLUXCAL meeting
de Graauw, Shipman       7/6/99-11/6/99         VILSPA    IST54, information exchange
Roelfsema                28/6/99-30/6/99        IPAC      POPS#14
Morris, Shipman,         TBD – Jul./Aug.        UvA       SWS flux cal. standards
Roelfsema                23/9/99-24/9/99        MPE       POPS#15
Beintema, Huygen,        27/9/99-28/9/99        MPE       SWS - POPS
Kester, Lahuis,
Roelfsema, Shipman,
Beintema                 TBD                    VILSPA    beam profile issues
Lahuis                   TBC - Oct./Nov.        VILSPA    IDC work
Kester                   TBD – Oct./Nov.        VILSPA    transients WG, IDC work
de Graauw, Shipman,      29/11/99-3/12/99       VILSPA    POPS#16, IST#55,
Roelfsema                                                 information exchange

Apart from these trips there are also a significant number of missions (partly) funded
by DIDAC involving discussions with outside groups (UCHII, flux cal. and STARTYPE
meetings) or presentations at both astronomical (e.g. Korea; astrochemistry) and
technical (Denver; SPIE) meetings. Especially from the ‘science oriented workshops’
(UCHII, STARTYPE etc.) a significant feedback into reduction procedures and
calibration is obtained.

                                                                 Doc: DIDAC/1999/04
Report 1999/Q2                                                   Date: 25 June, 1999

Who                     When                  Where     Why
Shipman,                5/5/99-7/5/99         Elspeet   NAC’99
Peeters, Roelfsema      27/5/99-28/5/99       Paris     UCHII project meeting
Kester, Lahuis,         21/6/99-22/6/99       Dalfsen   SRON science meeting
Peeters, Roelfsema,
de Graauw, Shipman,     15/7/99               UvA       meeting on STARTYPE and
Vandenbussche                                           Post-He programme
Vandenbussche           20/7/99-25/7/99       Denver    SPIE
Lahuis                  22/8/99-27/8/99       Korea     IAU 197; Astrochemistry
Shipman                 13/9/99-17/9/99       VILSPA    Extended sources workshop

1.3   Guests
Van Malderen from Leuven applied the memory effects routine developed by Kester
to his own data set. This proved to be a very useful exercise since he has first hand
knowledge of his data. His feedback has been invaluable.

Palacios just finished a 3-month visit to the DIDAC. He says his time was well spent
learning about reducing SWS data and the instrument itself. He also left us with an
excellent suggestion about how to improve the On-Line Help of IA3. He suggests
having 'See Also ...' statements for the different IA routines. His comment is that
there appear to be multiple routines for doing the same or similar tasks. These
should be linked somehow.

Hony (UvA) and van Kerckhoven (Leuven) spent another week at DIDAC to work on
PAH features in spectra of AGB and Ae/Be stars. This is a joint project with Peeters
(DIDAC) intercomparing these features between stellar sources and HII regions.

1.4   Offices
It is now clear that office space in the DIDAC area for Beintema and Roelfsema will
not become available before the end of August. However at that time we should get
access to several new offices as well as a meeting room.

1.5   Archive

A main topic at the DIDAC technical meetings was to identify what data we need
from VILSPA to complete the DIDAC database. Shipman and Vandenbussche
identified 962 observations that were not present in the SWS DIDAC database.
Among these missing files are all the post-He data but this does not account for all
the files. The remaining files are largely SWSACTV files but there are some
SWS_CAL observations and observer data as well. There is no noticeable pattern to
which files were omitted. Of these 962 events, 873 have already been retrieved from
the IDC on-line archive. The remaining 89 are listed in an earlier archive but not the
post mission on-line archive. The 873 events are currently being added to the DIDAC

                                                                     Doc: DIDAC/1999/04
 Report 1999/Q2                                                      Date: 25 June, 1999

Boxhoorn’s DIDAC software and hardware maintenance manual is somewhat
delayed but should become available over the next quarter.

2     Software systems

2.1   Operating systems, user environment
The merging of the KAI and SRON computing environments has met with another
hitch; the hot redundant servers turned out not to be hot redundant anymore under
Solaris 2.7. I fix for this is currently under investigation. Once this fix is implemented
the transfer of user directories etc. to the central server should commence (now
planned for July).

Lahuis and Kester have upgraded the DIDAC and IRAS web pages
( These pages are a great asset to the DIDAC since
they point DIDAC guests to most information they need to analyse ISO data.

The web pages will not only be a starting point to access the database here in
Groningen, they will also be a clearing house for up-to-date information concerning
calibration, data processing, and recent events which concern all ISO observers.

2.2   IA
Kester is continuing development of IA routines to reduce the effects of detector
memory (SPOPS work package) by applying the Fouks/Schubert theory. Lahuis has
run about 1000 AOT1 observations through the routine and identified some problems
and necessary updates. The main purpose is to get a consistent set of detector
parameters to characterise the memory effect for all data. This would allow
introduction of the formalism in OLP. Following introduction in OLP the next step
would be to update the calibration. This will be further discussed at the DIDAC
technical meetings.

DIDAC personnel have actively participated in the recent IA3 validation period.
Kester and Lahuis spent a total of 3 man weeks in VILSPA working on the validation.

Lahuis has provided pivotal input to the error propagation in future versions of IA3.
He has completed the updates of the SIGCLIP, SWS_REBIN and SWS_FLATFIELD.

2.3   OSIA
No activities.

2.4   OLP
Support has been given to the OLP 8.4 release. In May Lahuis has taken over some
of the implementation work for AA modules from Wieprecht (MPE). In June the OLP
validation was supported. We had some initial problems downloading the test cases
from the VILSPA server. These problems created a delay of one week in retrieving
them. However, given that the validation is simply a consistency check, we have

                                                                     Doc: DIDAC/1999/04
 Report 1999/Q2                                                      Date: 25 June, 1999

been able to do our part of the validation. Keane, Kester, Lahuis, Shipman and
Peeters inspected the products for the OLP test cases generated by VILSPA in
comparison to the results from processing the same data in IA. A number of
problems were found, these were reported to Wieprecht (MPE).

3 Hardware
A need has been identified for the possibility for DIDAC personnel to get access to
PC applications like MSWord, PowerPoint, a scanner etc. This need will be met in
two ways. Firstly a PC set up for general DIDAC use will be installed in one of the
DIDAC guest offices. Secondly software will be installed on one of the new NT
servers that will allow UNIX users to run PC applications.

4 Calibration

Work continues on the calibration of SWS. Shipman has met with Decin and
Vandenbussche at K.U. Leuven to discuss the plans for the next round of
calibrations. A follow up meeting is planned for July to discuss an inventory of
observations and models that can be used for Relative Spectral Response and Flux

4.1   Flux calibration
Shipman is currently investigating the corrections applied by the routine IA
SWS_FLATFIELD. Using a large database of observations, he has determined
systematic ‘gain errors’ still present in the reported fluxes of individual detectors. This
investigation will be continued in order to arrive at a proposal for future calibration
processing to alleviate these systematic errors.

4.2   Wavelength calibration
Kester has created a new time dependent wavelength calibration (cal116et). This
is now present and usable in IA3.

4.3   Optics
Beintema has continued work on the instrumental profile for AOT1 and on the
modelling of beam profiles. The results of this work, detailed theoretical beam
profiles, have been delivered to the IDC (Salama) in early June.

4.4   Instrument behaviour
No activities.

5 Science

The 2nd User DIDAC meeting was on the 26th of May. A very interesting talk was
given by Jean-Paul Baluteau, who was visiting the Kapteyn Institute from the
Laboratoire d'Astronomie Spatiale.

                                                                 Doc: DIDAC/1999/04
Report 1999/Q2                                                   Date: 25 June, 1999

Lahuis is wrapping up a paper on C2H2 and HCN in massive young stellar objects.
Shipman meets with Prusti and Kessler to discuss the STARTYP1/2 project.
Shipman also met with Laureijs to discuss data/data reduction for a project on very
small dust grain processing in heightened radiation fields.

Shipman presented the DIDAC at the Nederlandse Astronomen Conferentie 1999 in
Elspeet. The main purpose of attending was to advertise the data centre in
Groningen and its relation to the IDC in VILSPA. To this end the conference was a
success. As a result Shipman has been requested to visit the University of
Amsterdam to meet with UvA users of the DIDAC.


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