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DTSTAMP:20260415T201415
DTSTART:20140206T113000
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URL:https://murmitoyen.com/events/vanille/udem/detail/375794
LOCATION:Université de Montréal - Pavillon Roger-Gaudry\, 2900\, chemin d
 e la Tour\, Montréal\, QC\, Canada\, H3T 1J6
SUMMARY:The Evolutionary History of the R Coronae Borealis Stars
DESCRIPTION:Conférence de Geoffrey Clayton\, Louisiana State UniversityRé
 sumé The R Coronae Borealis (RCB) stars are very rare and very exciting.
  Their rarity may stem from the fact that they are in an extremely rapid p
 hase of the evolution or in an evolutionary phase that most stars do not u
 ndergo. The universe and almost all of the stars in it are about 90% hydro
 gen. The RCB stars have almost no hydrogen. They also have some very stran
 ge isotopic abundances. In particular\, they have about as much oxygen-18 
 as oxygen-16 whereas normal stars like our Sun have 500 times as much oxyg
 en-16 as oxygen-18.The RCB stars are best known for suddenly\, in a few we
 eks or months\, becoming thousands of times fainter than normal. This is c
 aused by the formation of clouds of carbon dust which eclipse the star. It
  is possible that the bizarre nature of these stars can be explained if th
 ey are the product of two stars which have merged into one star. I will pr
 esent recent visible and Infrared observations of various RCB stars obtain
 ed with Hubble Space Telescope\, and other space- and ground-based telesco
 pes. I will also present the results of hydrodynamic simulations of stella
 r mergers which we hope will produce RCB stars.Présentée par le Groupe A
 stronomie et astrophysique du Département de physique de l'Université d
 e Montréal. Cette conférence est destinée à des spécialistes dans le 
 domaine de l'astrophysique et sera donnée en anglais.
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