lect 13 part 1 - Stellar Evolution The Deaths of Stars...

Info icon This preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
3/17/2010 1 Stellar Evolution: The Deaths of Stars Chapter 20 part I: Low-mass Stars Pathways of Stellar Evolution Low-mass stars go through two distinct red-giant stages A low-mass star becomes – a red giant when shell hydrogen fusion begins a horizontal branch a horizontal-branch star when core helium fusion begins – an asymptotic giant branch (AGB) star when the helium in the core is exhausted and shell helium fusion begins
Image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
3/17/2010 2
Image of page 2
3/17/2010 3 Bringing the products of nuclear fusion to a giant star’s surface As a low-mass star ages, convection occurs over a larger portion of its volume This takes heavy elements formed in the star’s interior and distributes them throughout the star A Carbon Star is a AGB star that has undergone a 3 rd dredge-up Carbon is transported to the surface by ti d convection, and there are strong absorption bands of carbon-rich elements Stellar winds eject carbon-rich outer layers into space Low-mass stars die by gently ejecting their outer layers, creating planetary nebulae Helium shell flashes in an old, low-mass star produce thermal pulses during which more than half the
Image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern