Astronomy and Astrophysics, volume 506, 1249-1259 (2009/11-2)
Supernova progenitor stars in the initial range of 23 to 33 solar masses and their relation with the SNR Cassiopeia A.
PEREZ-RENDON B., GARCIA-SEGURA G. and LANGER N.
Abstract (from CDS):
Multi wavelength observations of Cassiopeia A (Cas A) have provided us with strong evidence of circumstellar material surrounding the progenitor star. It has been suggested that its progenitor was a massive star with strong mass loss. But, despite the large amount of observational data from optical, IR, radio, and x-ray observations, the identity of Cas A progenitor is still elusive. In this work, we computed stellar and circumstellar numerical models to look for the progenitor of Cas A. The models are compared with the observational constraints that come from chemical observed abundances and dynamical information. We first computed stellar evolution models to get time-dependent wind parameters and surface abundances using the code STERN. To explore the range of masses proposed by several previous works, we chose a set of probable progenitor stars with initial masses of 23, 28, 29, 30, and 33M☉, with initial solar composition luminous blue super giants (LBSGs), and Wolf-Rayet (WR) stars. We named these type of stars ``luminous blue super giant'' (LBSGs) to distinguish them from normal blue super giants (BSGs) of much lower initial masses. The 23M☉ star explodes as an RSG in a ρ∼r–2 dense, free-streaming wind surrounded by a thin, compressed, RSG shell. The 28M☉ star explodes as an LBSG, and the SN blast wave interacts with a low density, free streaming wind surrounded by an unstable and massive ``RSG+LBSG'' shell. Finally, the 30 and 33M☉ stars explode as WR stars surrounded by fast WR winds that terminate in a highly fragmented ``WR+RSG shell''. We compared the surface chemical abundances of our stellar models with the observational abundances in Cas A. The abundance analysis shows that the progenitor was a star with an initial mass of about 30M☉, while the hydrodynamical analysis favors progenitors with initial masses around 23.
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