The Cepheid distance to NGC 5253: Calibration of M(max) for the type IA supernovae SN 1972E and SN 1895B

Details The Cepheid distance to NGC 5253: Calibration of M(max) for the type IA supernovae SN 1972E and SN 1895B The Cepheid distance to NGC 5253: Calibration of M(max) for the type IA supernovae SN 1972E and SN 1895B

Mar 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...423l..13s&link_type=abstract

Astrophysical Journal, Part 2 - Letters, vol. 423, no. 1, p. L13-L17

Astronomy and Astrophysics

Astrophysics

105

Astrophysics, Calibrating, Cepheid Variables, Distance, Hubble Constant, Light Curve, Supernovae, Astronomical Photometry, Charge Coupled Devices, Hubble Diagram, Hubble Space Telescope

Scientific paper

The apparent V distance modulus of NGC 5253, parent galaxy to the Type Ia supernovae SN 1972E and SN 1895B is (m - M) AV = 28.06 +/- 0.06 mag (internal error) determined from 11 Cepheid variables discovered with the Hubble Space Telescope. The internal differential absorption between the Cepheids and the two SNs is taken to be zero based on four independent methods. The absolute magnitudes of SN Ia 1972E are MB(max) = -19.53 +/- 0.12, and MV(max) = -19.46 +/- 0.12. The absolute magnitude of SN Ia 1895B is MB(max) = -19.69 +/- 0.21, based on B(max) = 8.4 +/- 0.2 determined by correcting Walker's comparison stars, in 1923, to the modern photoelectric zero point in B. Combining these data with the data for SN 1937C in IC 4182 determined earlier gives mean values of = -19.55 +/- 0.08 mag based now on three SNs calibrations relative to Cepheids, and = -19.58 +/- 0.09 mag based on two Cepheid determinations. Using the extant Hubble diagrams in B and V for SNs Ia gives the global values of the Hubble constant as Hzero(B) = 52 +/- 8 km/sec/Mpc, and Hzero(V) = 55 +/- 8 km/sec/Mpc. The quoted error is the external uncertainty assuming an intrinsic dispersion of 0.3 mag about the Hubble diagram for SNs Ia.

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