HST Imagery of the Kepler Field-of-view Acquired with the WFPC2 and with the ACS

Details HST Imagery of the Kepler Field-of-view Acquired with the WFPC2 and with the ACS HST Imagery of the Kepler Field-of-view Acquired with the WFPC2 and with the ACS

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21542008v&link_type=abstract

American Astronomical Society, AAS Meeting #215, #420.08; Bulletin of the American Astronomical Society, Vol. 42, p.285

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Hubble Space Telescope (HST) imagery of four fields in the large Kepler Field-of-View (FOV) acquired with the WFPC2 and four reference star fields on the Galactic Equator with the ACS have been obtained and analyzed. The detected stars in the 18th to 26th magnitude range and the faint galaxies represent background objects to targets for the Kepler FOV. The WFPC2 dataset using the F606W filter consisted of dithered images. This dithering technique included a "multidrizzle” algorithm to enhance signal-to-noise and resolution in the four WFPC2 fields. As comparison fields, the HST/ACS data were acquired in the F606W and the F812W filters with total exposure time of 14340 sec. In the reduced WFPC and ACS images, we used SEXTRACTOR to identify stars and their positions in the sky, then the PYRAF and STSDAS/photometry packages to measure star magnitudes. We have created catalogs of the observed stars as well as generated V-I versus V color diagrams for the ACS observed fields. This information reveals stellar statistics as well as photometrical properties for individual stars and binary systems. The analysis of these WFPC2 and ACS images are essential to ascertain the level of photometric uncertainty in Kepler photometry used to search for transits of earth-like planets. The WFPC2 imagery for KEPLER FOV data show noticeable contributions from faint background galaxies not seen in the ACS dataset obtained at the Galactic Equator. This work has been supported through a Guest Observer program grant, GO-10166, from the Space Telescope Science Institute.

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