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17 April 2003

+----------------------------------------------------------+
| WFPC2
| STScI Analysis Newsletter
| WFPC2 STAN 54
| April 2003
+----------------------------------------------------------+

Part 1 of 5

Visit the WFPC2 web site http://www.stsci.edu/instruments/wfpc2
for the latest News.

CONTENTS:

- Cycle 12 Phase II Proposals

- WFPC2 Filter Wavelengths in the Archive

- Instrument Science Reports Since The Previous STAN: 
     03-01 WFPC2 Cycle 9 Closure Report

+----------------------------------------------------------+

Cycle 12 Phase II Proposals
Inge Heyer and James Rhoads

The Cycle 12 Phase II deadline is May 16, 2003. Documents to 
help observers in the preparation of the Phase II proposals
are available on our website. A summary of the most
important documents for WFPC2 programs can be found at
http://www.stsci.edu/instruments/wfpc2/wfpc2_quick.html

When looking for other WFPC2-specific documents, please
consult our homepage at 
http://www.stsci.edu/instruments/wfpc2/wfpc2_top.html

In particular we'd like to point out the Phase II Updates
page at
http://www.stsci.edu/hst/programs

The Phase II Proposal Instructions can be found at
http://www.stsci.edu/hst/programs/hst/proposing/docs/p2pi.html

One notable change for Cycle 12 is the introduction of the
APT proposal preparation tool for Phase II, which will be
the default tool as of Cycle 12. Training videos, manuals,
and other information regarding APT are available at
http://apt.stsci.edu/phase2/
General information on APT is available at 
http://apt.stsci.edu/


http://www-int.stsci.edu/instruments/wfpc2/wfpc2_advisory.html
WFPC2 Filter Wavelengths in the Archive
Anton Koekemoer and Gabriel Brammer

The HST Archive / CDBS catalog contains a number of different 
quantities that characterize the properties of each filter in 
the WFPC2 filter set. These quantities include the "Central 
Wavelength", which appears as a default output column in 
archive searches, as well as the "Pivot Wavelength" and other 
related quantities that are used to calculate photometric 
keywords such as PHOTFLAM, which can be used to define the 
zeropoints for WFPC2 photometry. The "Central Wavelength" 
values have been unchanged since the launch of WFPC2. They are 
not used to calculate any other quantities, yet have always 
appeared as a default output column in archive searches. On 
the other hand, quantities such as the Pivot Wavelength are 
better defined and are also regularly updated whenever there 
are changes to the system throughput tables in Synphot. There
have also been a few discrepancies between Central Wavelength 
and other, more up-to-date quantities, which have on occasion 
led to confusion. Therefore, the WFPC2 group, in conjunction 
with personnel in charge of CDBS, have chosen to replace the 
use of "Central Wavelength" with the use of "Pivot Wavelength".
The only effect that this will have is that, when archive 
searches are performed, the wavelengths listed for filters will 
now reflect the Pivot Wavelength. No other quantities are 
affected by this change; in particular, photometric keywords 
within the WFPC2 dataset headers will remain unchanged, since 
they are already consistent with the Pivot Wavelength and other 
regularly updated filter quantities. More details on this, 
including a table comparing the old Central Wavelength with 
the up-to-date Pivot Wavelength values for each filter, are 
available at the following URL:
http://www.stsci.edu/instruments/wfpc2/Wfpc2_memos/
wfpc2_filters_archive.html

http://www.stsci.edu/instruments/wfpc2/Wfpc2_isr/wfpc2_isr0301.html
WFPC2 Cycle 9 Closure Report
A. M. Koekemoer, S. Baggett, S. Casertano, S. Gonzaga, I. Heyer,
and the WFPC2 Group

This report describes in detail the WFPC2 observations used 
to maintain and improve the quality of WFPC2 calibrations 
during Cycle 9, and their status at completion of the Cycle.


+----------------------------------------------------------+
| Recent WFPC2-related Papers/Preprints
+----------------------------------------------------------+
We draw your attention to these papers, based on WF/PC and 
WFPC2 data, that have appeared since the last STAN, or 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.

ANDERSON, J.; KING, I.R. "An Improved Distortion Solution 
for the Hubble Space Telescope's WFPC2" 
PASP 115: 113-131, 2003
http://adsabs.harvard.edu/cgi-bin/
bib_query?bibcode=2003PASP..115..113A

APPLETON, P.N.; CHARMANDARIS, V.; GAO, Y.; JARRETT, T.; 
BRANSFORD, M.A. "Azimuthal and Kinematic Segregation of 
Neutral and Molecular Gas in Arp 118: The Yin-Yang Galaxy 
NGC 1144" ApJ 586: 112-122, 2003
http://adsabs.harvard.edu/cgi-bin/
bib_query?bibcode=2003ApJ...586..112A

BARBA, R.H.; RUBIO, M.; ROTH, M.R.; GARCIA, J. "Active Star 
Formation in the N11B Nebula in the Large Magellanic Cloud: 
a Seqential Star Formation Scenario Confirmed" 
AJ 125: 1940-1957, 2003
http://adsabs.harvard.edu/cgi-bin/
bib_query?bibcode=2003AJ....125.1940B

BAYER-KIM, C.M.; CRAWFORD, C.S.; ALLEN, S.W.; EDGE, A.C.; 
FABIAN, A.C. "The Peculiar Cooling Flow Cluster RX J0820.9+0752" 
MNRAS 337: 938-952, 2002
http://adsabs.harvard.edu/cgi-bin/
bib_query?bibcode=2002MNRAS.337..938B

BIK, A.; LAMERS, H.J.G.L.M.; BASTIAN, N.; PANAGIA, N.; 
ROMANIELLO, M. "Clusters in the Inner Spiral Arms of M 51: 
the Cluster IMF and the Formation History" 
A&A 397: 473-486, 2003
http://adsabs.harvard.edu/cgi-bin/
bib_query?bibcode=2003A%26A...397..473B

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