THE MINIMUM EJECTION VELOCITY OF CALCIUM IN TYPE IA SUPERNOVAE AND THE VALUE OF THE HUBBLE CONSTANT

Authors
FISHER A BRANCH D HOFLICH P KHOKHLOV A
Citation
A. Fisher et al., THE MINIMUM EJECTION VELOCITY OF CALCIUM IN TYPE IA SUPERNOVAE AND THE VALUE OF THE HUBBLE CONSTANT, The Astrophysical journal, 447(2), 1995, pp. 73-76
Citations number
34
Categorie Soggetti
Astronomy & Astrophysics
Journal title
The Astrophysical journal → ACNP
ISSN journal
0004637X
Volume
447
Issue
2
Year of publication
1995
Part
2
Pages
73 - 76
Database
ISI
SICI code
0004-637X(1995)447:2<73:TMEVOC>2.0.ZU;2-0
Abstract
Evidence is presented for a relation between the visual absolute magni tudes of Type Ia supernovae (SN Ia's) and their minimum ejection veloc ities of calcium as indicated by the red edge of the Ca II H and K abs orption blend in moderately late-time spectra. Independent calibration s of the relation by means of (1) the Cepheid-based distance to NGC 52 53, the parent galaxy of SN 1972E, and (2) light-curve calculations ba sed on hydrodynamic models of SN Ia's, give low H-0, near 60 km s(-1) Mpc(-1).