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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 is found by spectoscopic observations to be about 500 parsecs distant, its parallax is
about how many stars has hipparcos given us accurate distance data on
a millon, those with parallaxes of .005" or larger
in order to turn a star's proper motion into its space velocity, we must also know
the distance and radial velocity
if a star appears to move back and forth relative to other stars over a six-month period, this motion is due to the star's
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
perhaps the greatest of the greek astronomers____compiled the first catalog of stars accurately measured their positions, and defined the basic system of stella brigthness
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
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
compared to the size of the sun, between what range of sizes are most stars found
.01to 100 solar radii
the H-R diagaram plots ______ against the spectral type or temperature
luminosity or absolute magnitude
how might th emost common occurring stars be described, based on our stellar neighbrohood?
M, main sequence
in the HR diagram, the bright blue-white stars that dominate the naked eye sky lie to the ...
having nothing to do with trigonometry ____parallaxes use the width or absorption lines to estimate the stars luminosity and size and distance
upon what data do measurments of sizes of eclipsing binaries depend
their dopler shifts and durations of stages of their eclipses
in a visual binary system with circular orbits, if in 20 yrs the two stars position angles have shifted 30 degree, the pair's period must be
in a spectroscopic binary system, the star showing the larger blue shift is...
less massive and approaching us at this moment
in a spectroscopic binary, if a pair shows a combined set of line tonight, but a maximum split two nights later , its orbital period must be
what is the single most important characteristic in determening the course of a star's evolution
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