The Minimum Ejection Velocity of Calcium in Type IA Supernovae and the Value of the Hubble Constant

Details The Minimum Ejection Velocity of Calcium in Type IA Supernovae and the Value of the Hubble Constant The Minimum Ejection Velocity of Calcium in Type IA Supernovae and the Value of the Hubble Constant

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...447l..73f&link_type=abstract

Astrophysical Journal Letters v.447, p.L73

Astronomy and Astrophysics

Astronomy

37

Cosmology: Distance Scale, Galaxies: Distances And Redshifts, Stars: Supernovae: General

Scientific paper

Evidence is presented for a relation between the visual absolute magnitudes of Type Ia supernovae (SN Ia's) and their minimum ejection velocities of calcium as indicated by the red edge of the Ca II H and K absorption blend in moderately late-time spectra. Independent calibrations of the relation by means of (1) the Cepheid-based distance to NGC 5253, the parent galaxy of SN 1972E, and (2) light-curve calculations based on hydrodynamic models of SN Ia's, give low H0, near 60 km s-1 Mpc-1.

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