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  1. #1
    Luigi Caselli's Avatar
    Luigi Caselli Guest

    Default The Action of the dying Sun



    "G=EMC^2 Glazier" <herbertglazier@webtv.net> ha scritto nel messaggio
    news:22132-4013D278-12@storefull-3176.bay.webtv.net...

    What about if Eta Carinae will become a gravastar?
    Or this theory is completely wrong?

    Luigi Caselli




  2. #2
    John Zinni's Avatar
    John Zinni Guest

    Default The Action of the dying Sun

    "G=EMC^2 Glazier" <herbertglazier@webtv.net> wrote in message
    news:22132-4013D278-12@storefull-3176.bay.webtv.net...


    "The stars that eventually become neutron stars are thought to start out
    with about 15 to 30 times the mass of our sun."
    http://www.astro.umd.edu/~miller/nstar.html#formation





  3. #3
    John Zinni's Avatar
    John Zinni Guest

    Default The Action of the dying Sun

    "G=EMC^2 Glazier" <herbertglazier@webtv.net> wrote in message
    news:22132-40140EDB-31@storefull-3176.bay.webtv.net...

    Nonsense. Your "Heavy Books" probably say something like "a Neutron Star is
    about 1.4 solar masses". A Neutron Star does not contain the entire mass of
    its progenitor. I suggest you take a closer look at your "Heavy Books".



  4. #4
    John Zinni's Avatar
    John Zinni Guest

    Default The Action of the dying Sun

    "G=EMC^2 Glazier" <herbertglazier@webtv.net> wrote in message
    news:22132-40140EDB-31@storefull-3176.bay.webtv.net...

    "It is believed that the remnant of a core collapse SN is a neutron star if
    the mass of the progenitor is less than ~ 20-25M(Sun) [80, 78]. If the
    progenitor's mass is in the range 20-25 ~< M ~< 40-50M(Sun), not the entire
    star is ejected in the SN explosion. More than 2M(Sun) will fall back onto
    the nascent neutron star and lead to black hole formation. If the
    progenitor's mass exceeds roughly 40-50M(Sun), then no explosion will occur
    and the star will collapse directly to a black hole. These objects are known
    as collapsars. However, it is unclear if high metallicity stars with M >~
    40-50M(Sun) actually end their lives in collapse or are prevented from doing
    so by stellar wind driven mass loss [78]. Note that the limits on the
    progenitor masses quoted in this paragraph (especially the 40-45M(Sun),
    lower limit for direct black hole formation) are uncertain because the
    progenitor mass dependence of the neutrino explosion mechanism (see below)
    is unknown [88, 150]."
    http://www.emis.de/journals/LRG/Arti...new/node9.html






  5. #5
    John Zinni's Avatar
    John Zinni Guest

    Default The Action of the dying Sun

    "G=EMC^2 Glazier" <herbertglazier@webtv.net> wrote in message
    news:22135-401438C1-7@storefull-3176.bay.webtv.net...

    A reminder of your original statement ...


    This is simply untrue.

    A Main Sequence star with a mass below ~8M(Sun) is destined to end its life
    as a White Dwarf with a mass <1.4M(Sun).

    A Main Sequence star with a mass between ~8M(Sun) and ~20-25M(Sun) is
    destined to end its life as a Neutron Star with a mass between 1.4M(Sun) and
    ~2-3M(Sun).

    A Main Sequence star with a mass above ~20-25M(Sun) is destined to end its
    life as a Black Hole with a mass > ~2-3M(Sun).

    Check your "Heavy Books" yet again.



  6. #6
    Greysky's Avatar
    Greysky Guest

    Default The Action of the dying Sun


    "G=EMC^2 Glazier" <herbertglazier@webtv.net> wrote in message
    news:22132-4013D278-12@storefull-3176.bay.webtv.net...

    Action / reaction. The core contracts inwards and the rest of the sun will
    have to go the other way. Over its lifetime, as the sun begins to sputter
    out just before it begins to go from burning hydrogen to helium, the sun's
    outer envelope will expand outwards as the core contracts. Eventually, when
    there is no further elemental burning possible for our sun, the core
    collapses to a pukey Neutron star and the rest of the sun just keeps
    expanding forever in the form of a planetary nebule. If you want to know
    more, get our alien friends in Regulus to e-mail you some pretty pictures of
    other stars that end their life with not a bang but a whimper.

    Greysky

    www.allocations.cc
    Learn how to build a FTL radio.



  7. #7
    Luigi Caselli's Avatar
    Luigi Caselli Guest

    Default The Action of the dying Sun


    "G=EMC^2 Glazier" <herbertglazier@webtv.net> ha scritto nel messaggio
    news:22132-40140CFE-30@storefull-3176.bay.webtv.net...

    It's an interesting new theory a bit difficult to believe (not more than
    black holes...)

    You can see a rapid overview at
    http://www.space.com/scienceastronom...rs_020423.html

    "Emil Mottola of the Los Alamos National Laboratory and Pawel Mazur of the
    University of South Carolina suggest that instead of a star collapsing into
    a pinpoint of space with virtually infinite gravity, its matter is
    transformed into a spherical void surrounded by an extremely durable form of
    matter never before experienced on Earth."
    "The matter inside a gravastar would be akin to the Bose-Einstein
    condensate. It would exist in a vacuum, surrounded by an ultra-thin,
    ultra-cold, ultra-dark bubble, hence the name gra (vitational) va (cuum)
    star, or gravastar."

    I like this theory because I've always hated singularities, they bring too
    much entropy in our universe...
    ..
    Luigi Caselli



  8. #8
    Greysky's Avatar
    Greysky Guest

    Default The Action of the dying Sun


    "G=EMC^2 Glazier" <herbertglazier@webtv.net> wrote in message
    news:14166-40152906-145@storefull-3177.bay.webtv.net...

    See? Our sun is so pukey it can't even make a neutron star. I think I wanna
    apply for a scullery job aboard the spaceship of our alien friends...... at
    least I wont be embarrased anymore.

    Greysky

    www.allocations.cc
    Learn how to build a FTL radio.



 

 

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