Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...369l..35h&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 369, March 10, 1991, p. L35-L40. Research supported by Hubble Spa
Astronomy and Astrophysics
Astrophysics
30
Hubble Space Telescope, Stellar Spectrophotometry, Asphericity, Cameras, Cepheid Variables, Error Analysis, Point Spread Functions
Scientific paper
The prospects for the use of the Wide-Field/Planetary Camera (WFPC) for stellar photometry are described. The large halos of the point-spread function (PSF) resulting from spherical aberration and from spatial, temporal, and color variations of the PSF are the main limitations to accurate photometry. Degradations caused by crowding are exacerbated by the halos of the PSF. An attempt is made to quantify these effects and determine the current accuracy of stellar photometry with the WFPC. In realistic cases, the brighter stars in crowded fields have 0.09 mag errors; fainter stars have larger errors depending on the degree of crowding. It is shown that measuring Cepheids in Virgo Cluster galaxies is not currently possible without inordinate increases in exposure times.
Baum William A.
Campbell Bel
Code Arthur
Currie Douglas G.
Ewald Shawn P.
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