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Modelling the April 15 spectrum of Supernova 1993 J |
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| Authors: | Zhang Qing Wang Li-fan Hu Jing-yao P A Mazzali and Wang Zhen-ru |
| Institution: | 1 Department of Astronomy, Nanjing University, Nanjing 210008, China 2 Beijing Astronomical Observatory, Chinese Academy of Sciences, Beijing 100080, China 3 Osservatorio Astronomico, Via G. B. Tiepolo 11, I-34131, Trieste, Italy 4 European Southern Observatory, Garching b., München, Germany |
| Abstract: | We present the modeling of the ultraviolet and optical spectra obtained simultaneously on 1993 April 15 with the HST and at Lick Observatory. A Monte Carlo code is employed in the modeling and a comparison is made between models reported by different groups. With an atmosphere similar to the Sun in chemical composition, the observed spectral lines are well reproduced by a power law density structure of index around 20 except the strong H and HeI λ5876 lines which have peculiar absorption profiles. The photospheric velocity is found to be 9500 km/s and the blackbody temperature of the spectrum is 7990 K. For H and HeI λ5876, we suggest a two-component density structure which has a smoother layer located immediately outside the steeply decreasing inner envelope. The power law indices are most probably 20 and 3, respectively, with the transition point at about 13 000 km/s. In addition, this outer smooth layer serves to flatten the far UV spectrum as observed. |
| Keywords: | supernovae SN 1993 J line formation line identification |
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