Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

I Spectrum of a White Dwarf

  1. Apr 2, 2016 #1

    MMS

    User Avatar

    Hello,

    I read at a couple of places about white dwarfs having a spectrum similar to that of the sun.
    What does that mean or associate to?

    Thanks in advance.
     
  2. jcsd
  3. Apr 2, 2016 #2
    Sun is called yellow dwarf star and its on the way to become a white dwarf- perhaps have journey time left of the order of few billion years.
    the spectrum of white dwarf has similarities because of temperature of the star.

    it is burning about 600 million tonnes of hydrogen per second in its core -if they burn up then it turns into a red giant star a small sparkling jewel of a white dwarf star will remain. This tiny remnant will have a mass of around half that of our present Sun,
     
  4. Apr 2, 2016 #3

    MMS

    User Avatar

    Thanks for the reply.

    So when it is said that a white dwarf has a similar spectrum as the sun, what is meant by that is that they have the same temperature?
     
  5. Apr 2, 2016 #4
    It should be of the same order of magnitude...nearly 10,000 degree
     
  6. Apr 2, 2016 #5

    Ken G

    User Avatar
    Gold Member

    And bear in mind that the spectrum is light that comes from the shell of gas that clings to the surface of the star. That's what is similar in the two cases. You cannot see the interior of the star, and it is completely different in those two cases.
     
  7. Apr 2, 2016 #6

    Vanadium 50

    User Avatar
    Staff Emeritus
    Science Advisor
    Education Advisor

    Where?

    I find this surprising. Most, but not all, white dwarfs are significantly hotter than the sun. A white dwarf shows broad hydrogen lines and little else. The sun shows only weak and narrow hydrogen lines, but prominent sodium, calcium and iron lines.
     
  8. Apr 2, 2016 #7

    Janus

    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: Spectrum of a White Dwarf
  1. White dwarfs (Replies: 2)

  2. White dwarf (Replies: 1)

  3. White dwarfs catalogue (Replies: 5)

Loading...