For nearby stars. Measure length of a triangle's baseline and the angles from the ends of this baseline to a distant object.

Describe the method of distance measurement by triangulation.

For nearby stars. Measure length of a ________

Chapter 13

For nearby stars. Measure length of a triangle&#039;s baseline and the angles from the ends of this baseline to a distant object.

Using a method of triangulation called parallax.

How do astronomers triangulate a star&#039;s distance?

It is 3.26 light years. Defined by the distance at which an observer sees the maximum angle between the Sun and the Earth to be one arc second.

How is the parsec defined? How big is a parsec compared with a light-year?

How do astronomers measure a star&#039;s temperature?

relates an object&#039;s luminosity 
to its distance and its apparent brightness

What do astronomers mean by an inverse-square law?

measure of a star&#039;s energy production (or hydrogen fuel consumption)

What is luminosity? What two characteristics of a star determine its luminosity?

What does a star&#039;s magnitude measure? Which is brighter, a star of magnitude 1 or a star of magnitude 3?

O,B,A,F,G,K, and M O stars are the hottest M stars are the coolest.
K, and M consider cool.

What are the stellar spectral types? Which are hot and which cool?

As light moves through the gas of a star&#039;s 
surface layers, atoms absorb radiation at some wavelengths.

Why do stars have dark lines in their spectra?

Strengths of hydrogen lines depended on the star&#039;s temperature.

What is different about the spectra of different types of stars?

Study with Quizlet and memorize flashcards containing terms like Describe the method of distance measurement by triangulation., How do astronomers triangulate a star's distance?, How is the parsec defined? How big is a parsec compared with a light-year? and more.

Chapter 13 Flashcards

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