Astronomy and Astrophysics – Astronomy
Scientific paper
May 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977mnras.179..401b&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 179, May 1977, p. 401-408. NSF-supported research.
Astronomy and Astrophysics
Astronomy
43
Galactic Radiation, Light Curve, Photosphere, Radial Velocity, Supernovae, Color, Electron Scattering, Error Analysis, Hubble Diagram, Line Shape, Luminous Intensity, Magnitude, Optical Thickness
Scientific paper
A simple empirical model of the envelopes of type I supernovae is used to determine the value of the Hubble constant. Photometric data taken from smooth curves drawn through composite type I light and color curves are analyzed, and it is shown that the radius of a supernova photosphere increases linearly with time near maximum brightness over a period of at least 20 days, which implies a strong density gradient at the photosphere. The photospheric velocity and radius are derived along with the absolute magnitude at maximum brightness from calculated profiles of spectral lines formed above the photosphere by pure scattering in a strong density gradient. A Hubble constant of 49 + or - 9 km/s per Mpc is obtained by inserting the derived absolute magnitude into the equation that gives the logarithm of the Hubble constant in terms of absolute magnitude and the zero point of the relation between the apparent magnitude of type I supernovae at maximum brightness of the logarithm of the radial velocities of the supernova parent galaxies. Possible sources of errors in the results are briefly assessed.
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