Earth science 25.1
Upcoming SlideShare
Loading in...5
×

Like this? Share it with your network

Share
  • Full Name Full Name Comment goes here.
    Are you sure you want to
    Your message goes here
    Be the first to comment
    Be the first to like this
No Downloads

Views

Total Views
983
On Slideshare
983
From Embeds
0
Number of Embeds
0

Actions

Shares
Downloads
13
Comments
0
Likes
0

Embeds 0

No embeds

Report content

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
    No notes for slide

Transcript

  • 1. 25.1 Properties of Stars
  • 2. Constellation
    An apparent group of stars originally named for mythical characters. There are 88 constellations dividing up the sky.
  • 3. Binary Star
    One of two stars revolving around a common center of mass under their mutual gravitational attraction.
  • 4. Light-year
    The distance light travel in a year, about 9.5 trillion kilometers.
  • 5. Apparent Magnitude
    The brightness of a star when viewed from Earth.
  • 6. Absolute Magnitude
    The apparent brightness of a star if it were viewed from a distance of 32.6 light-years; used to compare the true brightness of stars.
  • 7. Main-Sequence Star
    A star that falls into the main sequence category on the H-R diagram; this category contains the majority of stars and runs diagonally from the upper left to the lower right on the H-R diagram.
  • 8. Red Giant
    A large, cool star of high luminosity; a star occupying the upper-right portion of the H-R diagram.
  • 9. Supergiant
    A very large, very bright red giant star.
  • 10. Cepheid Variable
    A star whose brightness varies periodically because it expands and contracts; a type of pulsating star.
  • 11. Nova
    A star that explosively increases in brightness.
  • 12. Nebulae
    A cloud of gas and/or dust in space.
  • 13. Key Concept
    Color is a clue to a star’s temperature.
  • 14. Key Concept
    Binary stars are used to determined the star property most difficult to calculate its mass.
  • 15. Key Concept
    The nearest stars have the largest parallax angles, while those of distant stars are too small to measure.
  • 16. Key Concept
    Three factors control the apparent brightness of a star as seen from Earth: how big it is, how hot it is, and how far away it is.
  • 17. Key Concept
    A Hertzsprung-Russell diagram shows the relationship between the absolute magnitude and temperature of stars.