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Stages of stellar evolution
I have been compiling a list of stages of stellar evolution, as nearly
as possible in order. There is substantial difference in the descriptions of the stages given by Carroll & Ostlie and by Binney & Merrifield. Carroll & Ostlie's description seems fairly detailed, well organised, and makes sense in terms of underlying physical processes, whereas Binney & Merrifield seem confused, disorganised, inconsistent, incomplete, and contaminated by ideas which I believe were discredited about 50yrs ago (there is similar inconsistency in Wikipedia articles, which I think originates in which of these texts the author of the article based his account). I am therefore working principally from Carroll and Ostlie. Does anyone have any other view on the relative merit of these treatments? I am not quite clear about what happens exactly at the end of the main sequence. As I understand, the subgiant branch starts from ignition of the thick Hydrogen shell, but this does not happen immediately on gravitational contraction of the burned out main sequence star. I interpret a diagram, not the text, as indicating a short period of re- ignition of hydrogen in the core before ignition of the shell. Is this right? I don't see a name for either the contraction following the horizontal branch, or the subsequent phase when there is a thick helium burning shell (corresponding to the subgiant branch) and before the asymptotic giant branch. Do these stages have names? Since the initial contraction is classified as part of the main sequence, why is this contraction not considered part of the horizontal branch? I would like to know if there is anything missing or inaccurate in my list. Any help would be much appreciated. 0 Protostar 1 Pre-main sequence (Herbig Ae/Be, T-tauri, FUor, brown dwarf) 2 Hydrogen burning core (main sequence) 3 Contraction 4 Re-ignition (end of main sequence) 5 Thick hydrogen burning shell (subgiant branch) 6 First dredge-up phase 7 Core contraction (red giant branch) 8 Helium burning first phase (horizontal branch) 9 Contraction/disappearance of convective shell 10 Helium burning main phase 11 Contraction (end of horizontal branch) 12 Thick helium burning shell 13 Second dredge-up phase 14 Contraction (asymptotic giant branch) 15 Helium shell flashes (irregular variables) 16 Third dredge-up phase 17 Carbon star 18 Shell expulsion (blue supergiant/Wolf-Rayet star) 19 White dwarf progenitor (planetary nebula) 20 White dwarf/Neutron star/Black hole Regards -- Charles Francis moderator sci.physics.foundations. charles (dot) e (dot) h (dot) francis (at) googlemail.com (remove spaces and braces) http://www.teleconnection.info/rqg/MainIndex |
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Stages of stellar evolution
In article , Oh No
writes: There is substantial difference in the descriptions of the stages given by Carroll & Ostlie and by Binney & Merrifield. Why not compare Kippenhahn & Weigert to the other two books? At the Saas-Fee course in 1993, Malcolm Longair said that he used K&W about once a day. Recommendations don't get much better than that. K&H is not the newest book, but I think for your questions it is still up to date. |
#3
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Stages of stellar evolution
Thus spake Phillip Helbig---remove CLOTHES to reply
LOTHESvax.de In article , Oh No writes: There is substantial difference in the descriptions of the stages given by Carroll & Ostlie and by Binney & Merrifield. Why not compare Kippenhahn & Weigert to the other two books? At the Saas-Fee course in 1993, Malcolm Longair said that he used K&W about once a day. Recommendations don't get much better than that. K&H is not the newest book, but I think for your questions it is still up to date. Thanks. I hadn't been able to find this book browsing on amazon, but it seems to be exactly what I want. Regards -- Charles Francis moderator sci.physics.foundations. charles (dot) e (dot) h (dot) francis (at) googlemail.com (remove spaces and braces) http://www.teleconnection.info/rqg/MainIndex |
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