* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download Brightness and Temperature of Stars
Survey
Document related concepts
Observational astronomy wikipedia , lookup
Aquarius (constellation) wikipedia , lookup
Perseus (constellation) wikipedia , lookup
Future of an expanding universe wikipedia , lookup
Proxima Centauri wikipedia , lookup
Extraterrestrial atmosphere wikipedia , lookup
Type II supernova wikipedia , lookup
Timeline of astronomy wikipedia , lookup
Corvus (constellation) wikipedia , lookup
Planetary habitability wikipedia , lookup
Malmquist bias wikipedia , lookup
Stellar classification wikipedia , lookup
Star formation wikipedia , lookup
Standard solar model wikipedia , lookup
Transcript
10/31/05 7:15 PM MAZER Page 467 SKILL: INTERPRETING A SCATTER PLOT Brightness and Temperature of Stars MATH TUTORIAL CLASSZONE.COM A star’s brightness, or luminosity, depends on the star’s surface temperature and size. If two stars have the same surface temperature, the larger star will be more luminous. The Hertzsprung-Russell (H-R) diagram below is a scatter plot that shows the relative temperatures and luminosities of various stars. Click on Math Tutorial for more help with scatter plots. Math 7.SD.1.2, 8.PS.8 Science 8.4.b Example Describe the surface temperature and luminosity of Spica. (1) Surface temperature: Without drawing on the graph, imagine a line extending from Spica down to the temperature axis. Spica is one of the hottest stars. (2) Luminosity: Imagine a line extending from Spica across to the luminosity axis. Spica has a high luminosity. ANSWER Spica is one of the hottest and most luminous stars. Use the diagram to answer the questions. brightest Hertzsprung-Russell (H-R) Diagram red supergiants blue supergiants Spica red giants 3. Compare the surface temperature and luminosity of the red dwarfs with the surface temperature and luminosity of the blue supergiants. the Sun Luminosity 1. Describe the surface temperature and luminosity of Proxima Centauri. 2. Compare the surface temperature and luminosity of the Sun with the surface temperature and luminosity of Betelgeuse. Betelgeuse white dwarfs red dwarfs dimmest s8pe-414mf-ca Proxima Centauri CHALLENGE When an old red giant star loses its outer atmosphere, all that remains is the very hot core of the star. Because the core is small, it does not give off much light. What kind of star does the red giant star become after it loses its outer atmosphere? How can you tell from the diagram? coolest hottest Surface temperature Chapter 14: Stars, Galaxies and the Universe 467 PDF