Calibration of Nearby Type Ia Supernovae as Standard Candles: NGC 3627 and SN 1989B

Details Calibration of Nearby Type Ia Supernovae as Standard Candles: NGC 3627 and SN 1989B Calibration of Nearby Type Ia Supernovae as Standard Candles: NGC 3627 and SN 1989B

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6549s&link_type=abstract

HST Proposal ID #6549

Computer Science

Hst Proposal Id #6549 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 5 SNe Ia, and have found Cepheids in the parent galaxy of a sixth. The resulting absolute magnitudes of SN 1937C {in IC4182 from Cycle 1} and SN 1895B and SN 1972E {both in NGC 5253 from Cycle 3} have been published; those of SN 1960F {in NGC 4496A} and SN 1981B {in NGC4536, both from Cycle 4} are completed and the archive papers will be submitted by Nov. 1, 1995. Data from Cycle 5 for SN 1990N {in NGC 4639} have yielded Cepheids and a preliminary distance from a partial reduction. The experiment is designed to determine the mean absolute magnitude M{max} in B and V of SNe Ia, and how large the dispersion is about this mean. To adequately do this we need the calibration of about 10 such SNe Ia. We request 34 orbits {two orbits each for 12 epochs in F555W and two orbits each for 5 epochs in F814W} for the two-color photometry of the Cepheids in NGC 3627, parent of SN 1989B, a prototype of a type Ia SN. The SN will provide M{max} in UBV and with somewhat lower weight also in JHK. From our previous experience we are convinced that the project is feasible. The galaxy is nearer than NGC 4496A and NGC 4536, yet being dust-rich it is not trivial.

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