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Review Question, Help.

  1. Jun 12, 2004 #1
    Having trouble with this question. Any help would be appreciated. I have narrowed the answers down

    1) A star which appears double when observed directly, and is held together by mutual gravitation is called???

    astrometric binary
    spectrophic binary
    visual binary
     
  2. jcsd
  3. Jun 12, 2004 #2

    Janus

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    The clue the the answer is in the words "observed directly".
     
  4. Jun 13, 2004 #3

    Chronos

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    it is a visual binary, until proven otherwise.
     
  5. Jun 13, 2004 #4

    Chronos

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    janus, that really was not fair. it was on honest question.
     
  6. Jun 13, 2004 #5

    Chronos

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    janus, you are very knowledgeable about these things. dont beat people over the head with it. most of those who come here are trying to learn. help them understand. be tolerant of them.
     
  7. Jun 13, 2004 #6

    Chronos

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    if you want to hammer me with the math, go ahead. you will win.
     
  8. Jun 18, 2004 #7

    Nereid

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    A visual binary is one which looks double; whether it's just a chance alignment or a gravitationally bound pair of stars requires further observations.

    A spectroscopic binary is a 'star' whose spectrum shows a periodic doubling of the spectral lines (or similar).

    What do you get when you enter 'astrometric spectroscopic visual binary' into Google?
     
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