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vii
Table of Contents
Preface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
vii
WFPC Status and Performance Changes 1990­1993
John W. MacKenty, Sylvia Baggett, John Biretta,
Christine Ritchie and W
illiam Sparks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1
The WFPC Calibration Pipeline
John A. Biretta, Sylvia M. Baggett, John W
. MacKenty,
Christine E. Ritchie and W
illiam B. Sparks. . . . . . . . . . . . . . . . . . . . . . . . . . .
8
WFPC Observed PSF Library
Sylvia M. Baggett and John W
. MacKenty. . . . . . . . . . . . . . . . . . . . . . . . . . .
20
WFPC Flat Field Calibration: Flats and DeltaFlats
John A. Biretta, Sylvia M. Baggett, John W
. MacKenty,
Christine E. Ritchie and W
illiam B. Sparks. . . . . . . . . . . . . . . . . . . . . . . . . .
37
Flat­Fielding and Photometric Accuracy of the WFC with the F555W
and F785LP Filters
Andrew C. Phillips, Duncan A. Forbes and Matthew A. Bershady
. . . . . . . .
54
Calibration of WFPC Images for Quantatitive Analysis of Faint Galaxy Images
Kavan U. Ratnatunga Richard E. Griffiths, Stefano Casertano,
Lyman W. Neuschaefer and Eric W
. Wyckoff. . . . . . . . . . . . . . . . . . . . . . . . . .
59
Introduction to WFPC Photometry
John A. Biretta, Sylvia M. Baggett, John W
. MacKenty,
Christine E. Ritchie and W
illiam B. Sparks. . . . . . . . . . . . . . . . . . . . . . . . . .
68
The WFPC Photometric System
W illiam A. Baum. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
77
Systematic Errors in WFPC Photometry
Robert M. Light. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
83
Reduction of WFC Images with DAOPHOT III
Peter B. Stetson. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
89
Ground­Based Calibration of the WFC
ALLFRAME Stellar Photometry in M81
Shaun M. G. Hughes, Peter B. Stetson, Anne T
urner,
Robert C. Kennicutt Jnr
, Robert Hill, Myung Gyoon Lee,
W endy L. Freedman, Jeremy R. Mould, Barry F
. Madore,
Laura Ferrarese, Holland C. Ford, John A. Graham,
John G. Hoessel and Garth D. Illingworth. . . . . . . . . . . . . . . . . . . . . . . . . . .
97

viii
Core PSF Photometry from WFC Images
Lukas Labhardt. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
103
FOC Status and Calibration
Antonella Nota, Dave Baxter, Perry Greenfield, W
arren Hack,
Phil Hodge, Robert Jedrzejewski and Francesco Paresce
. . . . . . . . . . . . . . .
109
Correcting for Non­Linearity in FOC Imaging Data
D. A. Baxter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
116
Removing Diagonal Stripes from FOC Images
Ivan R. King, Charles Bartels, Peter Nowak and W
arren Hack. . . . . . . . . .
128
Stellar Photometry with the FOC
Ivan R. King, Jay Anderson and Craig Sosin
. . . . . . . . . . . . . . . . . . . . . . . .
130
FOS Instrument Status and Performance Changes: 1990 ­ 1993
Charles D. (T
ony) Keyes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
138
FOS Calibration Pipeline
Anuradha Koratkar. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
143
FOS Aperture T
ransmissions for Point Sources and Surface
Brightness of Diffuse Sources (Pre­COSTAR)
R. C. Bohlin. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
159
Reference Guide and History of FOS Calibration Reference Files and T
ables
Cynthia J. T
aylor and Charles D. (T
ony) Keyes. . . . . . . . . . . . . . . . . . . . . .
174
Position Repeatability of Spectra Obtained with the FOS
R.W. L yons, E.A Beaver, R.D. Cohen and V
.T. Junkkarinen. . . . . . . . . . . . .
179
An Introduction to FOS Scattered Light
A. L. Kinney. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
184
Background Signals in FOS Data: Cerenkov and Scattered Light
Michael R. Rosa. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
190
Grating Scatter in the
HST FOS
Cindy C. Cunningham and John J. Caldwell. . . . . . . . . . . . . . . . . . . . . . . .
199
FOS Flat Fielding
Charles D. (T
ony) Keyes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
209
The HST Quasar Absorption Line Key Project XI: Some Practical Suggestions
for Flat Fielding Y
our FOS Data
Buell T
. Jannuzi and George F
. Hartig. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
215
Ultraviolet Calibration Issues in the FOS
Cindy C. Cunningham, Christopher D. Barnet and John J. Caldwell
. . . .
221

ix
UV Emission Lines in FOS Sky Spectra
R.W. L yons, W
.A. Baity, R.D. Cohen and V
.T. Junkkarinen. . . . . . . . . . . . .
229
Preliminary Comparison of the
HST and White Dwarf Absolute Flux Scales
Ralph Bohlin. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
234
Summary of the FOS W
orking Session
Anuradha Koratkar and Charles D. (T
ony) Keyes. . . . . . . . . . . . . . . . . . . . .
240
GHRS Instrument and Calibration Status: 1990­1993
Stephen J. Hulbert. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
243
Line Spread Functions for GHRS Spectra with the LSA (Pre­COST
AR)
Ronald L. Gilliland. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
249
GHRS Photocathode Blemishes: Discoveries Lurking in the Spectrum
Glenn M. Wahlgren, Jennifer L. Sandoval and Don J. Lindler
. . . . . . . . . .
254
An Assessment of the Pipeline W
avelength Calibrations for the
First­Order Gratings of the GHRS in Cycle 2
David R. Soderblom, Lisa E. Sherbert and Stephen J. Hulbert
. . . . . . . . . .
264
Using SPYBALs to Improve Pipeline W
avelength Calibrations for
the First­Order Gratings of the GHRS
David R. Soderblom, Lisa E. Sherbert and Stephen J. Hulbert
. . . . . . . . . .
275
W avelength Calibration of the GHRS
Don J. Lindler. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
278
Determining the V
ignetting and Echelle Blaze Function for the GHRS
R. D. Robinson. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
291
Calibration of GHRS Burst Noise Rejection T
echniques
E. A. Beaver, R. D. Cohen, A. Diplas, H. Garner
, S. R. Heap,
M. Loveland and R. D. Robinson. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
304
Dark Count Statistics for GHRS Detectors: A T
est of Noise
Rejection with FL
YLIM
Lisa E. Sherbert, Stephen J. Hulbert, Ronald L. Gilliland
and Joseph P
. Skapik. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
316
Attaining High Signal­to­Noise Data with the GHRS
Jason A. Cardelli and Dennis C. Ebbets
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
322
A Power Spectrum Method to Remove Fixed Pattern Noise From GHRS Spectra
Cheng­Hsuan Lyu and Fred C. Bruhweiler. . . . . . . . . . . . . . . . . . . . . . . . . .
332
An Evaluation of the Performance of SSA ACQ/PEAKUPs with the GHRS
Stephen J. Hulbert and W
ayne E. Baggett. . . . . . . . . . . . . . . . . . . . . . . . . . .
336

x
The Photometric Properties of the
HST Astrometer Fine Guidance Sensor
B. Bucciarelli, S. T
. Holfeltz, M. G. Lattanzi, L. G. T
aff and
P. C. V
ener­Saavedra. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
343
Optical Field Angle Distortion Calibration of FGS3
W . Jefferys, A. Whipple, Q. W
ang, B. McArthur, G. F
. Benedict,
E. Nelan, D. Story and L. Abramowicz­Reed. . . . . . . . . . . . . . . . . . . . . . . .
353
Maintaining the FGS3 OF
AD Calibration with the Long­Term Stability T
est
A. Whipple, W
. Jefferys, Q. W
ang, B. McArthur, G. F
. Benedict,
E. Nelan, D. Story and L. Abramowicz­Reed. . . . . . . . . . . . . . . . . . . . . . . .
375
Astrometric Stability and Precision of FGS #3: The Parallax and
Proper Motion of Proxima Centauri
G. F. Benedict, B. McArthur, E. Nelan, D. Story
, A. L. Whipple,
W . H. Jefferys, Q. W
ang, P
. J. Shelus, P
. D. Hemenway, J. McCartney,
Wm. F. van Altena, R. Duncombe, O. G. Franz and L. W
. Fredrick. . . . . . .
380
Binary Star Astrometry and Photometry from T
ransfer­Function Scans
withHST FGS3: Calibration, Stability, Precision, and Accuracy
O. G. Franz, J. N. Kreidl, L. H. W
asserman, A. J. Bradley, G. F
. Benedict,
R. L. Duncombe, P
. D. Hemenway, W. H. Jefferys, B. McArthur,
J. E. McCartney, E. Nelan, P
. J. Shelus, D. Story
, A. L. Whipple,
L. W. Frederick, Wm. F
. van Altena, M. G. Lattanzi and L. G. T
aff . . . . . .
385
Centroiding Planetary Camera Stellar Images
T. M. Girard, W
. F
. van Altena, W
. H. Jefferys, G. F
. Benedict,
P. D. Hemenway, P
. J. Shelus, O. G. Franz, L. W
. Frederick,
E. Nelan, D. Story, A. L. Whipple, B. McArthur, L. W
asserman,
J. McCartney, R. L. Duncombe, J. M. Nunez and A. Prades
. . . . . . . . . . . .
389
Calibrations of the
HST Optical T
elescope Assembly
H. Hasan and C. J. Burrows. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
395
The UV Sky Background
Adeline Caulet. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
406
The Calibration Data Base for the
HST
Colin Cox and Calvin T
ullos. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
407
Post­Observation GO Support
Krista Rudloff. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
415
White Dwarfs as Absolute Flux Standards
David S. Finley. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
416
NL TE Extended Atmospheres of Massive Stars
D.J. Lennon, R.­P. Kudritzki, A.W
.A. Pauldrach,
R. Gabler and S. Haser. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
423

xi
The Photometric Calibration of the
IUE Final Archive
R. Gonzalez­Riestra, A. Cassatella, H. Bushouse, D. Finley
,
A. de la Fuente, M. Garhart and M. Perez
. . . . . . . . . . . . . . . . . . . . . . . . . . .
427
Calibration of the Hopkins Ultraviolet T
elescope
Jeffrey W
. Kruk. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
432
Precision Photometry at the LMC Centre: Simulating Post­COST
AR
HST Observations
P. Linde, R. Snel and S. Spannare. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
442