Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979mnras.186..609b&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 186, Mar. 1979, p. 609-616.
Astronomy and Astrophysics
Astronomy
25
Black Body Radiation, Error Analysis, Hubble Constant, Stellar Spectra, Supernovae, Colorimetry, Photosphere, Red Shift, Root-Mean-Square Errors, Stellar Magnitude
Scientific paper
In a previous paper composite photometric and spectroscopic data were used, together with a simple empirical model, to derive the mean absolute magnitude of type I supernovae at maximum brightness; the result and the observed magnitude-redshift relation were employed to estimate the value of the Hubble constant. In the present paper the analysis is improved by replacing an analytical blackbody expression used earlier with a more accurate numerical relation and by incorporating the results of a recent investigation of the redshift-magnitude relation. A value of 56 + or - 15 km/s per Mpc is obtained for the Hubble constant and its internal rms error. Sources of systematic error are considered. It is shown that the observed B-V colors should be corrected to allow for the presence of lines and that such correction would reduce the value determined for the Hubble constant.
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