Volume 471, Number 2, August IV 2007
|Page(s)||527 - 535|
|Section||Interstellar and circumstellar matter|
|Published online||02 May 2007|
II. Optical spectroscopy and the high-velocity features
Department of Physics, Stockholm University, AlbaNova University Center, 10691 Stockholm, Sweden e-mail: email@example.com
2 LPNHE, CNRS-IN2P3, University of Paris VI & VII, Paris, France
3 Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Str. 1, 85741 Garching bei München, Germany
4 Astrophysics Research Centre, School of Mathematics and Physics, Queen's University Belfast, BT7 1NN, UK
5 INAF Osservatorio Astronomico di Padova, Vicolo dell'Osservatorio 5, 35122 Padova, Italy
6 Universidad de La Laguna, Av. Astrofísico Francisco Sánchez s/n, 38206 La Laguna, Tenerife, Spain
7 APC, Université Paris 7, 10 rue Alice Domon et Léonie Duquet, 75205 Paris Cedex 13, France
8 INAF Osservatorio Astronomico di Trieste, via Tiepolo 11, 34131 Trieste, Italy
9 Calar Alto Observatory Centro Astronómico Hispano Alemán C/ Jesús Durbán Remón, 2-2 04004 Almeria, Spain
10 Research School of Astronomy and Astrophysics, Australian National University, Cotter Road, Weston Creek, ACT 2611, Australia
Accepted: 13 February 2007
The ESC-RTN optical spectroscopy data set for SN 2005cf is presented and analyzed. The observations range from -11.6 and +77.3 days with respect to B-band maximum light. The evolution of the spectral energy distribution of SN 2005cf is characterized by the presence of high velocity and features. SYNOW synthetic spectra are used to investigate the ejecta geometry of silicon. Based on the synthetic spectra, the high-velocity feature appears detached at 19 500 km s-1. We also securely establish the presence of such a feature in SN 1990N, SN 1994D, SN 2002er, and SN 2003du. In a morphological study both the IR triplet and H&K absorption lines of SN 2005cf show high-velocity features centered around 24 000 km s-1. When compared with other type Ia SNe based on the scheme presented in [CITE][ApJ, 623, 1011]2005ApJ...623.1011B, SN 2005cf definitely belongs to the LVG group.
Key words: stars: supernovae: general / stars: supernovae: individual: SN 2005cf
© ESO, 2007
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