Pushing the limits of variable stars detection with HST

Details Pushing the limits of variable stars detection with HST Pushing the limits of variable stars detection with HST

Jul 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9219s&link_type=abstract

HST Proposal ID #9219

Physics

Hst Proposal Id #9219 Cosmology

Scientific paper

We propose to use the novel method of image subtraction designed to find variable stars, and apply it to HST/WFPC2 data of the galaxy NGC 4603. This galaxy has been observed to discover Cepheids and obtain a distance. It is the most distant galaxy in which Cepheids have been found and the resulting distance may be affected by systematic errors, most notably the fact that non-variable stars contaminate the sample of Cepheids. The image subtraction technique offers a better way to find variable stars in very crowded environments. We will use this technique to find Cepheids in NGC4603 and obtain light curves. We will assess the reality of the variables found previously and it is likely that we will find more Cepheids. Combined with standard PSF photometry, we will be able to obtain a more accurate and more reliable distance to this galaxy.

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