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22 terms

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?