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For refcode 1993AJ....105.2231B:
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1993AJ....105.2231B SPECTROSCOPIC DIFFERENCES BETWEEN SUPERNOVAE OF TYPE Ia IN EARLY-TYPE AND IN LATE-TYPE GALAXIES DAVID BRANCH Department of Physics and Astronomy, University of Oklahoma, Norman, Oklahoma 73019 Electronic mail: branch@phyast.nhn.uoknor.edu SIDNEY VAN DEN BERGH Dominion Astrophysical Observatory, National Research Council, 5071 West Saauich Road, Victoria, British Columbia, V8X 4M6, Canada Electronic mail: vaudenbergh@dao.nrc.ca Received 1993 January 27 revised 1993 February 17 ABSTRACT Published data are used to derive a uniform set of blueshifts in the {lambda}6355 feature of Si II for 33 supernovae of type Ia (SNe Ia). All seven SNe Ia with blueshifts at ten days past maximum <9500 km s^-1^ occurred in early-type (E, S0, Sa) galaxies. The observed dependence of Si II blueshift on parent-galaxy type indicates that differing SNe Ia blueshifts are due to global physical differences, rather than to asymmetries in their expansion that are viewed from different directions. It is speculated that SNe Ia with low expansion velocities might, in the mean, have older progenitors than those with high expansion velocities.
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