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Expanding photospheres of type II supernovae and the extragalactic distance scale
Schmidt, Brian P.; Kirshner, Robert P.; Eastman, Ronald G.
AA(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA), AB(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA), AC(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA; Lick Observatory, Santa Cruz, CA)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 395, no. 2, Aug. 20, 1992, p. 366-386. (ApJ Homepage)
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NASA/STI Keywords:
Black Body Radiation, Light Curve, Nonequilibrium Thermodynamics, Photosphere, Supernovae, Infrared Astronomy, Planetary Nebulae, Stellar Luminosity, Variable Stars
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The Expanding Photosphere Method is applied here to determine distances to 10 Type II SNe, exploring the effects of asymmetries, extinction, and flux dilution. It is shown that blackbody corrections caused by flux dilution are small for type II SNe in the infrared, and in the optical when their color temperatures are less than 6000 K. The distance measurements to the SNe span a wide range of 50 kpc to 120 Mpc, which is unique among the methods for establishing the extragalactic distance scale. A value of H(0) = 60 +/- 10 km/s/Mpc is derived.

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