The Cepheid Distance to NGC 5253: Calibration of M(max) for SNe IA 1972E and 18955B

Details The Cepheid Distance to NGC 5253: Calibration of M(max) for SNe IA 1972E and 18955B The Cepheid Distance to NGC 5253: Calibration of M(max) for SNe IA 1972E and 18955B

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...183.7214s&link_type=abstract

American Astronomical Society, 183rd AAS Meeting, #72.14; Bulletin of the American Astronomical Society, Vol. 25, p.1404

Astronomy and Astrophysics

Astronomy

Scientific paper

The apparent V band distance modulus of NGC 5253, parent galaxy to the type Ia supernovae 1972E and 1895B, is (m -M)AV = 28.06 +/- 0.06 mag determined from eleven Cepheid variables with unambiguous periods obtained with the Hubble Space Telescope. The internal reddening is zero to within E(B - V) < 0.03 mag, determined from four independent methods. The absolute magnitudes of SN Ia 1972E are MB(max) = -19.53 +/- 0.12 , and M_V(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 (1923) comparison stars 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 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 SN Ia gives the global values of the Hubble constant as H0(B) = 52 \pm 8 km s^{-1 Mpc^{-1} } and H0(V) = 55 \pm 8 km s^{-1 Mpc^{-1} } The quoted error is the external uncertainty assuming an intrinsic dispersion of 0.3 mag about the Hubble diagram for SN Ia. Subject headings: Cepheids - distance scale - Galaxies:individual: NGC 5253 - Supernovae: individual:1895B, 1972E

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