# astronomy chapter 17

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chapter 17

5 parsecs

### what is proper motion

it is the annual apparent motion of a star across the sky

### which statement about stellar motion is incorrect

like parallax, proper motion is measured over intervals of exactly six months

### which of the following best describes the size and distance relationship of our sun and the nearest star

two golf balls separated by 100 kilometers

### if a star has a parallax of .05, then its distance in light years is about

65 light years away

.002"

200 parsecs

### about how many stars has hipparcos given us accurate distance data on

a millon, those with parallaxes of .005" or larger

.25"

parallax shift

### if a star appears to move relatie to other stars over a one year period, this motion is due to the star's

transverse motion or true space motion

+4.8

ten parsecs

hipparchus

### in comparing first magnitude Deneb will second magnitude Polaris, we find that....

Deneb appears 2.5 times brighter to us than does Polaris

### at the distance of jupiter (6 times further away from the sun than the earth) the amount of sunligth received per square centimeter different by waht factor

36 times less (inverse sqaure law)

### Star A and star B have an apparent magnitude of 4.0 but star A has an absolute magnitude of 1.0 and star B has an absolute maginuted of 7.0 then...

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

### star A snd B have the same apparent magnitude of 7.0. but star A is at a distance of 15 pc and star B is at a distance of 30 pc...then

star A and B appear to have the same brigthness, but actually star B is brighter thans star A

### star A and B both have an absolute magnitude of 2.0 but star A is at a distance of 50 pc and star B is at a distance of 20 pc...then

star B appears brighter than star A, but actually star A and B are the same brightness

### star A and star B have an absolute magnitude of 2.0 but star A has an apparent magnitude of 5.0 and star B of 7.0..then

star A appears brighter than star b, BUT in actuallity both have the same broightness

### star A has an absolute magnitude of 2.5 and star B an apparent magnitude of 2.5, but star A is a main sequence star an star B is a red giant...then

its impossible to dtermine how bright they are given the information

### what are the two most important intrinsinc properties used to classify stars

luminosity and surface temperature

temperature

temperature

the sun

### star A is a main sequence star of spectral type F2 and star B is a white dwarf of spectral type..then

star B is hotter than star A

### star A is a main sequence star of spectral type G5 and star B is a red giant of spectral type k2..THEN

star A is hotter than star B

white dwarfs

### on the H-R diagram , the sun lies

about the middle of the main sequence

### which of the following is th emost commno type of star

low mass main sequence

### the H-R diagaram plots ______ against the spectral type or temperature

luminosity or absolute magnitude

M, main sequence

at the top right

### on the HR diagram white dwarfs like Sirius B and Procyon B lie

at the lower left

top left

spectroscopic

### in general the narrower the spectral line of a star

the bigger the star is

### upon what data do measurments of sizes of eclipsing binaries depend

their dopler shifts and durations of stages of their eclipses

eclipsing

### in what range of masses are most stars found

.1-100 solar masses

240 years

### in a spectroscopic binary system, the star showing the larger blue shift is...

less massive and approaching us at this moment

8 days

mass

a trillion years

10 billion years

20 milion years

### for a star 10 solar masses, its main sequence life span will be

only 1/1000th of the sun

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