Abstract
Luminosity of 41 Type Ia supernovae (SNe Ia) have been studied solely from the observational angle. The connections between the peak luminosity of SNe Ia and distance-independent observables (DIOs) could be established. The variation in the luminosity of the SN mainly depends on two separate DIOs: SN Ia’sB —V color at maximum light and Δm15(B) (or other measurements of the light curve shape). For most of SNe Ia, the main parts of the observedB —V colors at maximum light are intrinsic. The correlation of(B— V) max with the luminosity is more efficient in reducing the scatter in the Hubble diagrams than other DIOs. When SNe Ia in nearby galaxies with cepheid distances are tied to 41 Hubble-flow SNe Ia, the value of present Hubble constant is obtained, which is 61±5 (statistical)kms -1 Mpc -1. KeywordsVersus ColorHubble ConstantHost GalaxyNearby GalaxyMaximum LightThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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