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SUMMARY:Numerical modelling of stellar winds for supernova progenitors
DTSTART;VALUE=DATE-TIME:20110714T063000Z
DTEND;VALUE=DATE-TIME:20110714T064500Z
DTSTAMP;VALUE=DATE-TIME:20260715T040717Z
UID:indico-contribution-5092@events.saip.org.za
DESCRIPTION:Speakers: Stefanus Petrus van den Heever (North West Universit
 y)\nA two-dimensional hydrodynamic numerical model is extended and applied
  to simulate the interaction between stellar winds and the interstellar me
 dium (ISM). In particular\, the stellar wind evolution of O-and B-type sta
 rs is calculated. First\, the evolution of a stellar wind into the ISM and
  also a more dense molecular cloud are considered for the case of no relat
 ive motion between the star and the ISM. This interaction results in a cav
 ity being blown into the ISM. Of importance is the boundary radius (astrop
 ause) and the location where the outflow speed decreases from supersonic t
 o subsonic speeds\, the termination shock. Parameters like ISM density\, o
 utflow speed and mass-loss rate were varied to study the difference in the
  computed astropause (AP) and termination shock (TS) radii. The evolution 
 of these structures is presented to a simulation time of 1 My. The evoluti
 on of stellar winds into the ISM including relative motion is also conside
 red. It is shown that the positions of the TS and AP are dependent on the 
 mass-loss rate and stellar wind outflow speed of the star and the interste
 llar medium density and relative speed. When these massive stars reach the
  end of their life\, they end their life in a supernova explosion. The exp
 losion results in a blast wave moving outward\, called the forward shock (
 FS) and a reverse shock (RS) also forms which moves inward. Ferreira and d
 e Jager 2008 simulated supernova remnant (SNR) evolution for the case of e
 volution into the undisturbed ISM (no cavity). The evolution of SNR is sim
 ulated taking also into account the pre-existing cavity blown out by the s
 tellar winds of these massive stars. The results of this study showed that
  the evolution of the SNR is definitely influenced by the presence of a st
 ellar wind cavity even if the cavity is only a few pc in extent.\n\nhttps:
 //events.saip.org.za/event/7/contributions/5092/
LOCATION: Acro2
URL:https://events.saip.org.za/event/7/contributions/5092/
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