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Researchers Discover a Star's Minimum Possible Mass

paulmac84 writes "Stars that don't have enough mass never shine, dying billions of years before their bigger counterparts. But astronomers have never been able to measure the exact mass limit, because the lightest stars that do shine can be simply too faint to detect. Now, new images show for the first time how big a star must be to avoid impending doom. The long-awaited new images finally lay this question to rest, say the authors. The dimmest stars were measured as being 8.3% of the Sun's mass. All protostars that are smaller than this are headed for life as a brown dwarf."

6 of 112 comments (clear)

  1. Finally a Definitive Answer! by Aidski · · Score: 3, Insightful

    ...Unless newer technology finds dimmer stars, and they have to lower the minimum again.

    1. Re:Finally a Definitive Answer! by bradkittenbrink · · Score: 1, Insightful

      I have a strange suspicion that after I go RTFA, I'll be able to come back and say RTFA!

    2. Re:Finally a Definitive Answer! by helioquake · · Score: 2, Insightful

      Photometric uncertainty with the HST/ACS could probably be as high as one percent. There is no way in this kind of astronomy that can determine the percentage good to 0.1%.

      I know what you are getting at: you are basically talking about significant figures, which isn't a bad guess. But here I am referring to more traditional statistical errors that should be propagated through analysis.

      I just read the actual paper and it doesn't have any good estimate on the error.

      Just FYI.

  2. Re:For those who are wondering... by tgd · · Score: 3, Insightful

    Silly, a LoC is a unit of informational quantity, not mass.

    What we really need to know is how many clown-laden Bugs is that?

  3. Re:Um... yay? by ZorbaTHut · · Score: 4, Insightful

    Many years ago people believed that heavy things fell faster than light things. They didn't bother testing this theory because they knew it to be true. Then, one day, someone tested that theory and found it was false.

    Perhaps it is a simple problem to answer mathematically. And now we've tested it. We have actual data. Does the data match up with the mathematical answer? Maybe, maybe not, I don't pretend to know. But I imagine people out there do - so either we've got another point of verification that our models are good, or it's time to figure out what's wrong with them.

    Either way, this is what's called Science.

    --
    Breaking Into the Industry - A development log about starting a game studio.
  4. Re:For those who are wondering... by Dachannien · · Score: 3, Insightful

    Silly, a LoC is a unit of informational quantity, not mass.

    Holy crap, you mean the Library of Congress is massless?!