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Discovery of Cepheids in NGC 5253: Absolute peak brightness of SN Ia 1895B and SN Ia 1972E and the value of H(sub 0)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)(sub 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 B(sub max) = 8.33 +/- 0.2 mag for SN 1895B, and B(sub max) = 8.56 +/- 0.1 and V(sub max) = 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 B(sub max) value.
Document ID
19950048229
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Saha, A.
(Space Telescope Science Institute, Baltimore, MD United States)
Sandage, Allan
(Observatories of the Carnegie Institution, Pasadena, CA United States)
Labhardt, Lukas
(Univ. Basel Binningen, Switzerland)
Schwengeler, Hans
(Univ. Basel Binningen, Switzerland)
Tammann, G. A.
(Univ. Basel Binningen, Switzerland)
Panagia, N.
(Space Telescope Science Institute, Baltimore, MD United States)
Macchetto, F. D.
(Space Telescope Science Institute, Baltimore, MD United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1995
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 438
Issue: 1
ISSN: 0004-637X
Subject Category
Astronomy
Accession Number
95A79828
Distribution Limits
Public
Copyright
Other

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