The Minimum Ejection Velocity of Calcium in Type IA Supernovae, The Hubble Constant, and the Distance to SN 1981B

Details The Minimum Ejection Velocity of Calcium in Type IA Supernovae, The Hubble Constant, and the Distance to SN 1981B The Minimum Ejection Velocity of Calcium in Type IA Supernovae, The Hubble Constant, and the Distance to SN 1981B

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...185.7908f&link_type=abstract

American Astronomical Society, 185th AAS Meeting, #79.08; Bulletin of the American Astronomical Society, Vol. 26, p.1445

Astronomy and Astrophysics

Astronomy

Scientific paper

Evidence is presented for a relation between the visual absolute magnitudes of SNe Ia 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 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 SNe Ia, give H_0 =~ 55 +/- 10\ km\ s(-1) \ Mpc(-1) . We estimate the distance to NGC 4536 and its SN 1981B to be 19 +/- 3 Mpc. A Cepheid--based distance to NGC 4536 is expected to be available in the near future.

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