Computer Science
Scientific paper
Jul 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002hst..prop.9351r&link_type=abstract
HST Proposal ID #9351
Computer Science
Hst Proposal Id #9351
Scientific paper
We propose to determine the luminosity of the type Ia supernova {SN Ia} 1994ae by observing Cepheids in the host spiral galaxy NGC 3370. Modern CCD photometry has yielded an extremely tight Hubble diagram for SNe Ia with a precisely determined intercept {i.e., Delta H_0/H_0} 1 measurement of the true Hubble constant is still limited by the calibration. The HST calibration of all but a few SNe Ia observed to date is significantly compromised by the systematics of photographic photometry and host galaxy extinction, as well as by the photometric uncertainties associated with WFPC2. In contrast, SN 1994ae is one of the very best-observed SNe Ia with CCD photometry. The exquisite B, V, R, and I light curves are well-sampled beginning 10 days before maximum brightness, and they indicate little reddening. From our supernova photometry and the current provisional SN Ia calibration we would find a distance of 30 +/- 2.1 Mpc, well within the range where ACS can accurately observe Cepheid light curves and distinguish Cepheids from nonvariable stars.
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