Astronomy 17, The Stars

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at the top right

On the H-R diagram, red supergiants like Betelguese lie

0.01 to 100 solar radii

Compared to the size of the Sun, between what range of sizes are most stars found?

5 parsecs

A nearby star has a parallax of 0.2 seconds. What is its distance?

low mass main sequence

Which of the following is the most common type of star

two golf balls separated by 100 kilometers

Which of the following best describes the size and distance relationship of our Sun and the nearest star?

the bigger the star is

In general, the narrower the spectral line of a star

less massive and approaching us at this moment

In a spectroscopic binary system, the star showing the larger blue shift is

at the lower left

On the H-R diagram, white dwarfs lie Sirius B and Procyon B lie

.1 to 100 solar masses

In what range of masses are most stars found?

mass

What is the single most important characteristic in determining the course of a star's evolution?

20 million years

What is the typical main sequence lifetime of a B-type star?

luminosity and surface temperature

What are the two most important intrinsic properties used to classify stars:

Star B is hotter than star A

Star A is a main sequence star of spectral type F2 and star B is a white dwarf of spectral type B4. Which statement is correct?

Deneb appears 2.5 times brighter to us than does Polaris

In comparing first magnitude Deneb with second magnitude Polaris, we find that:

10 billion years

What is the typical main sequence lifetime of a G-type star?

ten parsecs

The absolute magnitude of a star is its brightness as seen from a distance of

the Sun

The most famous G type star is

a trillion years

What is the typical main sequence lifetime of a M-type star

spectroscopic

Having nothing to do with trigonometry, ____ parallaxes use the width of absorption lines to estimate the star's luminosity and size and distance.

white dwarfs

Stars that have masses similar to the Sun's, and sizes similar to the Earth are

.002

If a star is found by spectroscopic observations to be about 500 parsecs distant, its parallax is

Star A and star B appear to have the same brightness, but actually star A is brighter than B

Star A and star B both have an apparent magnitude of 4.0, but star A has an absolute magnitude of 1.0 and star B has an absolute magnitude of 7.0. Which statement below is correct?

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