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PRODID:https://murmitoyen.com/events/vanille/udem/
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UID:69e153714dbaa
DTSTAMP:20260416T172401
DTSTART:20130314T113000
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URL:https://murmitoyen.com/events/vanille/udem/detail/183644
LOCATION:Université de Montréal - Pavillon Roger-Gaudry\, 2900\, chemin d
 e la Tour\, Montréal\, QC\, Canada\, H3T 1J6
SUMMARY:The Structure of the Bipolar Jet in the Red Rectangle
DESCRIPTION:Joshua Thomas\, University of ToledoRésumé/abstract:In this 
 presentation we will discuss the analysis of optical spectra\, which were
  acquired with the ARCES echelle spectrograph (R = 38\,000) on the 3.5-m 
 telescope at the Apache Point Observatory. We will examine the H-alpha pr
 ofile in each of these observations in order to determine the geometry an
 d velocity structure of the previously discovered bipolar jet\, which ori
 ginates from the secondary star of HD 44179 located at the centre of the 
 Red Rectangle nebula. Using a 3D geometric model we are able to determine
  the orbital coverage during which the jet occults the primary star. Duri
 ng the occultation\, part of the H-alpha line profile appears in absorpti
 on. The velocity structure of the jet was determined by modelling the abs
 orption line profile using the Sobolev approximation for each orbital pha
 se during which we have observations. The results indicate the presence o
 f a wide angle jet\, likely responsible for observed biconical structure 
 of the outer nebula. Furthermore\, we were able to determine a likely vel
 ocity structure and rule out several others. We find that the jet is comp
 rised of low-density\, high-velocity\, central region and ahigher-density\
 , lower-velocity\, conical shell.Ce séminaire est présenté par le group
 e astronomie et astrophysique du Département de physique de l'Universit
 é de Montréal.
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