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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 276795.0, MPI für Astronomie / Publikationen_mpia
Spectroscopic observations and analysis of the unusual type Ia SN 1999ac
Authors:Garavini, G.; Aldering, G.; Amadon, A.; Amanullah, R.; Astier, P.; Balland, C.; Blanc, G.; Conley, A.; Dahlén, T.; Deustua, S. E.; Ellis, R.; Fabbro, S.; Fadeyev, V.; Fan, X.; Folatelli, G.; Frye, B.; Gates, E. L.; Gibbons, R.; Goldhaber, G.; Goldman, B.; Goobar, A.; Groom, D. E.; Haissinski, J.; Hardin, D.; Hook, I.; Howell, D. A.; Kent, S.; Kim, A. G.; Knop, R. A.; Kowalski, M.; Kuznetsova, N.; Lee, B. C.; Lidman, C.; Mendez, J.; Miller, G. J.; Moniez, M.; Mouchet, M.; Mourão, A.; Newberg, H.; Nobili, S.; Nugent, P. E.; Pain, R.; Perdereau, O.; Perlmutter, S.; Quimby, R.; Regnault, N.; Rich, J.; Richards, G. T.; Ruiz-Lapuente, P.; Schaefer, B. E.; Schahmaneche, K.; Smith, E.; Spadafora, A. L.; Stanishev, V.; Thomas, R. C.; Walton, N. A.; Wang, L.; Wood-Vasey, W. M.
Date of Publication (YYYY-MM-DD):2005
Title of Journal:The Astronomical Journal
Journal Abbrev.:The Astronomical Journal
Start Page:2278
End Page:2292
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:We present optical spectra of the peculiar Type Ia supernova (SN Ia) 1999ac. The data extend from -15 to +42 days with respect to B-band maximum and reveal an event that is unusual in several respects. Prior to B-band maximum, the spectra resemble those of SN 1999aa, a slowly declining event, but possess stronger Si II and Ca II signatures (more characteristic of a spectroscopically normal SN). Spectra after the B- band maximum appear more normal. The expansion velocities inferred from the iron lines appear to be lower than average, whereas the expansion velocity inferred from calcium H and K are higher than average. The expansion velocities inferred from Si II are among the slowest ever observed, although SN 1999ac is not particularly dim. The analysis of the parameters v10(Si II), R(Si II), v̇, and Deltam15 further underlines the unique characteristics of
Free Keywords:Stars: Supernovae: General; supernovae: individual (SN 1999ac)
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL:http://adsabs.harvard.edu/cgi-bin/nph- bib_query?b... [ID No:1]
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