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WFPC2 STAN

S T A N / W F P C 2 - Number 25, May 1997

CONTENTS:

WFPC2 SYNPHOT Tables Update:

-S. Baggett, S. Casertano, S. Gonzaga, C. Ritchie

The STSDAS tables used by synphot to provide the photometric calibration information in the image headers (photflam, pivwav, etc.) have been updated based on new calibration data. Details concerning the changes will be documented in an Instrument Science Report to be issued later in June. All UV filters shortward of F439W were updated, as well as some of the more frequently-used broadband filters redward of F439W (F450W, F555W, F606W, F675W, F702W, F785LP, F791W, F814W, F850LP, and F1042M). Changes were installed in the OPUS pipeline May 16, 1997.

With a few exceptions, changes to non-UV filter modes were relatively minor: generally ~1-2% or less. F785LP, F850LP, and F1042M were more: ~1-4%, ~1-6$, and ~2-15% for them, respectively, depending on the chip. The UV filters required somewhat larger changes to bring synphot into agreement with the observations, ranging from ~2% (e.g., F255W and F300W) to ~5% (F170W, F218W) to 10% or more (F160BW, F375N). Any filters not updated at this time will be checked with future observations (planned for summer of 1997) and updated if necessary.

The new tables, along with a README file (containing history of all WFPC2 SYNPHOT updates), are available via anonymous ftp to stsci.edu, in the directory cdbs/comp/wfpc2. Note that the tables are in binary STSDAS format, readable with tasks in the IRAF/STSDAS ttools and synphot packages. A table summarizing the photflam changes and new zero-points, as well as the README file (guide to WFPC2 SYNPHOT tables) and ASCII versions of the tables, can all be found under the Photometry section on the WFPC2 Web pages.

For general information about SYNPHOT, please refer to the SYNPHOT User's Guide. Paper copies may be requested from help@stsci.edu.

RECENT PREPRINTS:

We draw your attention to these papers, based on WF/PC and WFPC2 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.

AJHAR, E.A.; LAUER, T.R.; TONRY, J.L.; BLAKESLEE, J.P.; DRESSLER, A.;
HOLTZMAN, J.A.; POSTMAN, M.  "Calibration of the surface brightness
fluctuation method for use with the Hubble Space Telescope"  AJ

BEST, P.N.; LONGAIR, M.S.; ROTTGERING, H.J.A.  "A jet-cloud interaction
in 3C34 at redshift z = 0.69"  MNRAS accepted

BOWER, G.A.; HECKMAN, T.M.; WILSON, A.S.; RICHSTONE, D.O.  "The nuclear
ionized gas in the radio galaxy M84 (NGC 4374)"  ApJ accepted

DEVEREUX, N.; FORD, H.; JACOBY, G.  "Hubble Space Telescope imaging of
the central 1 Kpc of M81"  ApJ 6-1-97

DRIVER, S.P.; COUCH, W.J.; ODEWAHN, S.C.; WINDHORST, R.A.  "Evolution
of the morphological luminosity distributions within rich clusters (0.0
< z < 0.55)"  Tex. Symp. 18

FERRARO, F.R.; PALTRINIERI, B.; FUSI PECCI, F.; CACCIARI, C.; DORMAN,
B.; ROOD, R.T.; BUONANNO, R.; CORSI, C.E.; BURGARELLA, D.; LAGET, M.
"HST observations of blue straggler stars in the core of the globular
cluster M3" A&A accepted

LORENZ, R.D.; SMITH, P.H.; KARKOWSCHKA, E.; LEMMON, M.T.; CALDWELL,
J.D.  "Titan's north-south asymmetry from Hubble Space Telescope and
Voyager imaging"  Icarus

MUTZ, S.B.; WINDHORST, R.A.; WITTMAN, D.; CLOSE, L.M.; MCCARTHY, D.W.
JR.  "High-resolution V, I, and K-band imaging of faint field galaxies
from the HST medium-deep survey"  AJ 5-97

ODEWAHN, S.C.; WINDHORST, R.A.; DRIVER, S.P.; KEEL, W.C.  "Automated
morphological classification in deep HST fields:  rapidly and passively
evolving faint galaxy populations" HST and the High Redshift Universe

PANAGIA, N.; ROMANIELLO, M.; SCUDERI, S.  "HST study of the stellar
population within 30 PC of SN 1987A"  SN 1987A: Ten Years After

RICHER, H.B.; FAHLMAN, G.G.; IBATA, R.A.; PRYOR, C.; BELL, R.A.; BOLTE,
M.; BOND, H.E.; HARRIS, W.E.; HESSER, J.E.; HOLLAND, S.; IVANANS, N.;
MANDUSHEV, G.; STETSON, P.B.; WOOD, M.A.  "White dwarfs in globular
clusters: HST observations of M4"  ApJ 8-97

SAHU, K.C.; LIVIO, M.; PETRO, L.; MACCHETTO, F.D.; VAN PARADIJS, J.;
KOUVELIOTOU, C.; FISHMAN, G.J.; MEEGAN, C.A.; GROOT, P.J.; GALAMA, T.
"The optical counterpart to gamma-ray burst GRB970228 observed using
the Hubble Space Telescope"  Nature 5-29-97

SHARA, M.M.; ZUREK, D.R.; WILLIAMS, R.E.; PRIALNIK, D.; GILMOZZI, R.;
MOFFAT, A.F.J.  "HST imagery of the non-expanding, clumped `shell' of
the recurrent nova T Pyxidis"  AJ 7-97

APPENDIX: WFPC2 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. If you do not know who these persons are, you can find the information on the WWW at http://www.stsci.edu/public/propinfo.html.

Analysis, STSDAS or any other questions can also be addressed to help@stsci.edu.

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