| Institution: | INAF –Osservatorio Astronomico di Padova, vicolo dell'Osservatorio 5, I-35122 Padova, Italy;Universidad de La Laguna, Av Astrofísico Francisco Sánchez s/n, E-38206 La Laguna, Tenerife, Spain;Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Str. 1, D-85748 Garching bei München, Germany;INAF –Osservatorio Astronomico di Trieste, via Tiepolo 11, I-34131 Trieste, Italy;European Southern Observatory, Karl-Schwarzschild-Str. 2, D-85748 Garching bei München, Germany;Astrophysics Group, Imperial College London, Blackett Laboratory, Prince Consort Road, London SW7 2AZ;Departamento de Astronomía y Astrofísica, Pontificia Universidad Católica, Chile;Departament d'Astronomia i Meteorologia, Universitat de Barcelona, Martíi Franquès 1, E-08028 Barcelona, Spain;National Astronomical Observatories, Chinese Academy of Sciences, 100012 Beijing, China;Australian National University, Mount Stromlo Observatory, Cotter Road, Weston, ACT 2611, Canberra, Australia |
| Abstract: | We present optical and near-infrared photometry and spectroscopy of the Type Ia SN 2003cg, which exploded in the nearby galaxy NGC 3169. The observations cover a period between ?8.5 and +414 d post-maximum. SN 2003cg is a normal but highly reddened Type Ia event. Its B magnitude at maximum B max= 15.94 ± 0.04 and Δ m 15( B )obs= 1.12 ± 0.04 Δ m 15( B )intrinsic= 1.25 ± 0.05] . Allowing RV to become a free parameter within the Cardelli et al. extinction law, simultaneous matches to a range of colour curves of normal SNe Ia yielded E ( B ? V ) = 1.33 ± 0.11 , and RV = 1.80 ± 0.19 . While the value obtained for RV is small, such values have been invoked in the past, and may imply a grain size which is small compared with the average value for the local interstellar medium. |
