Calibration of Nearby Type Ia Supernovae as Standard Candles: The Next Three-Year Step

Details Calibration of Nearby Type Ia Supernovae as Standard Candles: The Next Three-Year Step Calibration of Nearby Type Ia Supernovae as Standard Candles: The Next Three-Year Step

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7504s&link_type=abstract

HST Proposal ID #7504

Computer Science

Hst Proposal Id #7504 Cosmology

Scientific paper

We propose to continue our calibration experiment for M{max} of type Ia supernovae {SNe Ia} by determining Cepheid distances to their parent galaxies. To date we have completed the calibration for 6 SNe Ia, from Cycles 1, and 3 - 5. The results for 5 SNe Ia have been published in extenso. A letter on the sixth SN Ia, SN 1990N, has also been published; the full archive paper will be submitted by Nov. 1, 1996. HST observations of NGC 3627 {SN 1989B}, originally scheduled for 1996, have been postponed to 1997. The experiment is designed to determine the mean absolute magnitude M{max} in B and V of SNe Ia and to test the possible dependence of their luminosities on secondary parameters. To adequately do this we need the calibration of additional SNe Ia with modern photometry and lying in galaxies of different Hubble type. We request 4 * 34 orbits {+ 4 orbits for a feasibility test} over a three-year interval {cycles 7 - 9} for the two-color photometry of the Cepheids in four target galaxies {two orbits each for 12 in one case 13 epochs in F555W and two orbits each for 5 in one case 6 epochs in F814W}. The four galaxies are, in order of preference, NGC 4527 {SN 1991T, cycle 7}, NGC 3370 {SN 1994ae, cycle 8}, NGC 1316 {SNe 1980N and 1981D, cycles 7 and 8}, and NGC 4419 {SN 1984A, cycle 9}. Their five SNe Ia are well observed and fulfill the condition {B-V}_max < 0{m}20 to guard against peculiarities and internal absorption.

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