Expanding Photospheres of Type II Supernovae and the Extragalactic Distance Scale

Details Expanding Photospheres of Type II Supernovae and the Extragalactic Distance Scale Expanding Photospheres of Type II Supernovae and the Extragalactic Distance Scale

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...18110704s&link_type=abstract

American Astronomical Society, 181st AAS Meeting, #107.04D; Bulletin of the American Astronomical Society, Vol. 24, p.1292

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We use the Expanding Photosphere Method to measure distances to type II supernovae. The method requires accurate models of supernova atmospheres, but provides distances which are independent of all other steps in the extragalactic distance scale. We present detailed atmospheric models of SN 1990E which include the effects of spherical geometry, and which treat H, He, N, Ca, and Fe in non-LTE. Applying these models to observations of SN 1990E, we measure the distance to NGC 1035, SN 1990E's host galaxy, to be 20+/-2 Mpc. We present additional models representing a wide variety of progenitors, and demonstrate that the distances derived using EPM are not sensitive to metallicity or to the physical structure of the progenitor. We apply EPM to 15 SNe II lying at distances ranging from 50 kpc to greater than 100 Mpc, and discuss the implications of these distances on H_0. Preliminary indications suggest that EPM yields a value for H_0 between 50 and 70 km s(-1) Mpc(-1) . This research is funded by NSF grant AST89-05529 and NASA grants NAGW-1789, NAG5-841, and NGT-51002.

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