Maqola

The Reddening-Free Decline Rate Versus Luminosity Relationship for Type [CLC]Ia[/CLC] Supernovae

M. M. PhillipsLas Campanas Observatory, Carnegie Observatories, Casilla 601, La Serena, ChileP. LiraDepartment of Physics & Astronomy, University of Leicester, Leicester, LE1 7RH, U.KN. B. SuntzeffCerro Tololo Inter-American Observatory, National Optical Astronomy Observatories,Cerro Tololo Inter-American Observatory, National Optical Astronomy Observatories, operated by the Association of Universities for Research in Astronomy, Inc., under cooperative agreement with the National Science Foundation. Casilla 603, La Serena, ChileR. A. SchommerCerro Tololo Inter-American Observatory, National Optical Astronomy Observatories,Cerro Tololo Inter-American Observatory, National Optical Astronomy Observatories, operated by the Association of Universities for Research in Astronomy, Inc., under cooperative agreement with the National Science Foundation. Casilla 603, La Serena, ChileM. HamuyUniversity of Arizona, Steward Observatory, Tucson, Arizona 85721J. MazaCátedra Presidencial de Ciencias (Chile) 1995

1999en

ABI

Annotatsiya

We develop a method for estimating the host galaxy dust extinction for type Ia supernovae based on an observational coincidence first noted by Lira (1995), who found that the B-V evolution during the period from 30-90 days after V maximum is remarkably similar for all events, regardless of light curve shape. This fact is used to calibrate the dependence of the B(max)-V(max) and V(max)-I(max) colors on the light curve decline rate parameter delta-m15, which can, in turn, be used to separately estimate the host galaxy extinction. Using these methods to eliminate the effects of reddening, we reexamine the functional form of the decline rate versus luminosity relationship and provide an updated estimate of the Hubble constant of Ho = 63.3 +- 2.2(internal) +- 3.5(external) km/s/Mpc.

Hali tarjima qilinmagan

Identifikatorlar

DOI: 10.1086/301032

Iqtiboslar va manbalar

4 ta iqtibos0 ta foydalanilgan manba

Koʻrsatkichlar — AkademScholar