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Premaximum observations of the type Ia SN 1990NSpectroscopic and photometric observations of SN 1990N were obtained at ultraviolet and optical wavelengths, beginning 14 days before maximum light. The early observations reveal important differences from spectra of SN Ia's around maximum light. Photometry and spectroscopy obtained after maximum show that SN 1990N is a typical SN Ia and that most of the observed differences are due to the early epoch of the observations. The most significant characteristics are (1) the high velocities of Ca and Si up to 22,000 km/s; (2) the presence of Co and Fe 2 weeks before maximum; and (3) the more rapid increase in the UV flux compared to the optical. The most popular models for white dwarf deflagration that have provided the standard interpretation for SN Ia's at maximum light do not reproduce the high velocities of Ca II and Si II lines observed in SN 1990N.
Document ID
19910048325
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Leibundgut, Bruno
(Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Kirshner, Robert P.
(Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Filippenko, Alexei V.
(Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Shields, Joseph C.
(California, University Berkeley, United States)
Foltz, Craig B.
(Multiple Mirror Telescope Observatory Tucson, AZ, United States)
Phillips, Mark M.
(Observatorio Interamericano de Cerro Tololo La Serena, Chile)
Sonneborn, George
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 14, 2013
Publication Date
April 10, 1991
Publication Information
Publication: Astrophysical Journal, Part 2 - Letters
Volume: 371
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
91A32948
Funding Number(s)
CONTRACT_GRANT: NSF AST-89-05529
CONTRACT_GRANT: NSF AST-89-57063
CONTRACT_GRANT: NSF AST-88-09616
CONTRACT_GRANT: NAG5-841
Distribution Limits
Public
Copyright
Other

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