Discovery of Cepheids in NGC 5253: Absolute peak brightness of SN IA 1895B and SN IA 1972E and the value of H0

Details Discovery of Cepheids in NGC 5253: Absolute peak brightness of SN IA 1895B and SN IA 1972E and the value of H0 Discovery of Cepheids in NGC 5253: Absolute peak brightness of SN IA 1895B and SN IA 1972E and the value of H0

Jan 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...438....8s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 438, no. 1, p. 8-26

Astronomy and Astrophysics

Astrophysics

147

Cepheid Variables, Dwarf Galaxies, Hubble Constant, Supernovae, Astronomical Spectroscopy, Brightness Distribution, Hubble Space Telescope, Light Curve, Stellar Magnitude

Scientific paper

Observations of the Hubble Space Telescope (HST) between 1993 May 31 and 1993 July 19 in 20 epochs in the F555W passband and five epochs in the F785LP passband have led to the discovery of 14 Cepheids in the Amorphous galaxy NGC 5253. The apparent V distance modulus is (m-M)AV = 28.08 +/- 0.10 determined from the 12 Cepheids with normal amplitudes. The distance modulus using the F785LP data is consistent with the V value to within the errors. Five methods used to determine the internal reddening are consistent with zero differential reddening, accurate to a level of E(B-V) less than 0.05 mag, over the region occupied by Cepheids and the two supernovae (SNe) produced by NGC 5253. The apparent magnitudes at maximum for the two SNe in NGC 5253 are adopted as Bmax = 8.33 +/- 0.2 mag for SN 1895B, and Bmax = 8.56 +/- 0.1 and Vmax = 8.60 +/- 0.1 for SN 1972E which is a prototype SN of Type Ia. The apparent magnitude system used by Walker (1923) for SN 1859B has been corrected to the modern B scale and zero point to determine its adopted Bmax value.

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