Stellar photometry including saturated images: Results on M67 with WFPC2

Ronald Lynn Gilliland

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

The Wide Field and Planetary Camera 2 (WFPC2) on HST is providing unsurpassed imaging capabilities and supporting accurate stellar photometry over large fields of view at high angular resolution. I discuss a feature of the WFPC2 CCD systems that nominally limits the dynamic range attainable with single exposures: a 12 bit analog to digital converter that does not allow sampling of the CCD full-well depth even at the low gain (14e-/DN) setting. I demonstrate that accurate stellar photometry can be performed on stellar images that are strongly saturated. Two 40 s exposures in V and I bands on the old open cluster M67 are analyzed to demonstrate photometric capabilities with a dynamic range of over 12 mag from single exposures. New photometric results for both bright and faint objects in M67 are derived from the WFPC2 data.

Original languageEnglish (US)
JournalAstrophysical Journal
Volume435
Issue number1 PART 2
StatePublished - Nov 1 1994

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photometry
cameras
dynamic range
charge coupled devices
faint objects
open clusters
analog to digital converters
extremely high frequencies
field of view
angular resolution
sampling
well
high resolution
exposure

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Gilliland, Ronald Lynn. / Stellar photometry including saturated images : Results on M67 with WFPC2. In: Astrophysical Journal. 1994 ; Vol. 435, No. 1 PART 2.
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Stellar photometry including saturated images : Results on M67 with WFPC2. / Gilliland, Ronald Lynn.

In: Astrophysical Journal, Vol. 435, No. 1 PART 2, 01.11.1994.

Research output: Contribution to journalArticle

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