Model atmospheres for type Ia supernovae:
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Supernovae and the Hubble Constant (or Butthead’s Revenge)
RESUMEN Physical models of Type Ia supernovae (SN Ia) that do not depend on secondary calibrators have indicated that the Hubble Constant must be ∼ 65 km s −1 Mpc −1 for well over a decade with the range of uncertainty shrinking with the sophistication of the models. This estimate is in good agreement with those based on HST observations of Cepheid variables and with purely empirical methods ba...
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Spectroscopic analyses with the intention of the interpretation of the UV-spectra of the brightest stars as individuals – supernovae – or as components of star-forming regions – massive O stars – provide a powerful tool with great astrophysical potential for the determination of ex-tragalactic distances and of the chemical composition of star-forming galaxies even at high redshifts. The perspec...
متن کاملOld-fashioned or Trendy?
Spectroscopic analyses with the intention of the interpretation of the UV-spectra of the brightest stars as individuals – supernovae – or as components of starforming regions – massive O stars – provide a powerful tool with great astrophysical potential for the determination of extragalactic distances and of the chemical composition of star-forming galaxies even at high redshifts. The perspecti...
متن کاملMetallicity Effects in NLTE Model Atmospheres of Type Ia Supernovae
We have calculated a grid of photospheric phase atmospheres of Type Ia supernovae (SNe Ia) with metallicities from ten times to one thirtieth the solar metallicity in the C+O layer of the deflagration model, W7. We have modeled the spectra using the multi-purpose NLTE model-atmosphere and spectrum-synthesis code, PHOENIX. We show models for the epochs 7, 10, 15, 20, and 35 days after explosion....
متن کاملSn 1984a and Delayed Detonation Models of Type Ia Supernovae
Received ; accepted – 2 – ABSTRACT SN 1984A shows unusually large expansion velocities in lines from freshly synthesized material, relative to typical Type Ia Supernovae (SNe Ia). SN 1984A is an example of a group of SNe Ia which have very large blue-shifts of the P-Cygni features, but otherwise normal spectra. We have modeled several early spectra of SN 1984A with the multipurpose NLTE model a...
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تاریخ انتشار 2007