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Astronomy Chp 12
Measuring the Properties of Stars
| Question | Answer |
|---|---|
| Star X shows parallax of 0.1 arcseconds. Star Y shows parallax of 0.05 arcseconds. Compare the distances of these stars from the Sun. Star X is 2 times closer; Star X is 2 times farther; Star Y is 5 times closer; Star Y is 5 times farther | Star X is 2 times closer than star Y |
| Two identical stars, X and Y, have apparent magnitude 2 and 4, respectively. We can conclude that: Y is twice as bright as X; T is twice as luminous as X; X is much closer to Sun; Y is much closer to Sun; not enough info | Star X is much closer to the Sun |
| The star Procyon has apparent magnitude 0.4, while Rigel has 0.1 . Which of the two stars appears brighter to an observer on Earth? rigel; procyon; not enough info | rigel |
| Knowing the luminosity and apparent brightness of a star allows calculation of the: distance, mass, speed, spectral type | distance |
| Two stars have the same radius. The temperature of star A is twice that of star b. Compared to star B, the luminosity of star A is: 2x; 4x; 8x; 16x | 16x larger |
| Two stars, X and Y, have absolute magnitude 2 and 3, respectively. We can conclude that: Y is 2.51 brighter; Y is 2.51 more luminous; X is much closer to sun; Y is much closer; not enough info | Not enough info |
| Given the relatively uniform composition of stars, which of the following could produce observable differences in the spectra? surface temp; recession/approach speed; density; all of above; 1st and 3rd choice | all of above |
| Which of the following stars is hotter? B star, F star, L star, G star | B star |
| Which star is hotter than a K star but cooler than an F star? B star, G star, M star, O star, A star | G star |
| Which of the following is true about the spectra of type O stars? strong absorption, strong emission, strong ionized emission, strong ionized absorption, all of above | strong ionized absorption lines |
| Which of the following is a main-sequence star hotter than the Sun? red giant, white dwarf, F star, K star | K star |
| The H-R diagram is a diagram plotting the stars according to their: apparent brightness and temp; spectral type and temp; brightness and luminosity; luminosity and temp; mass and diameter | luminosity and temp |
| Binary star systems are very important because they allow measurement of: masses, speed, distance, temperature, spectral type | star masses |
| What is the difference between spectroscopic and visual binaries? | in a visual binary we can see two distinct stars; in spectroscopic the images cannot be resolved |
| The study of eclipsing binary stars is very important because it allows astronomers to determine: distance, speed, diameter, luminosity, brightness | diameters of stars |
| Stars on the main sequence have different luminosities because they have different: chemical compositions; ages; distances from sun; masses; apparent magnitude | masses |
| Which of the following statements about the mass-luminosity relation is correct? relates the luminosity to mass only; shows more massive stars are dimmer; luminosity related to mass for any star; red giants have less mass; more massive stars are cooler | relates the luminosity to mass only |
| Which of the following is not true for a pulsating star? surface temp changes; outer layers expand and contract; luminosity changes; usually members of eclipsing binary stars; show shifts in spectral lines | usually members of an eclipsing binary star |
| What can we conclude about a star whose luminosity varies in an irregular pattern? star is very young, star is very old, star is rotating; very youn and very old; very young and rotating | star is very young and star is very old |
| The _____ method can be used to measure the _____ of nearby stars. parallax/radius; stardard candle/brightness; interferometry/radius | interferometry; radius |
| The parallax of a star is ____ usually measured in ____. distance/arc seconds; angle/arc seconds; angle/parsecs; distance/AUs | angle/arc seconds |
| A near-by star is more likely to have_____. large parallax; high dopper shift; small parallax; high temp | large parallax |
| The luminosity of a star is determined by the star’s ___ and ____. brightness/temp; apparent brightness/temp; diameter/temp; distance/temp; diameter/distance | diameter/surface temp |
| From the Stefan-Boltzmann law, a star’s luminosity is equal to ____ times ____. surface area/T4; distance/brightness; surface area/temp; diameter/T4 | surface area/T4 |
| The Balmer lines correspond to wavelengths in the ____ part of the spectrum of a ____ atom. uv/helium; visible/hydrogen; infrared/hydrogen; xray/helium; infrared/hydrogen | visible/hydrogen |
| The hydrogen absorption lines are the strongest in ___ type stars. A, B, O, G | A |
| Lines from molecules are strongest in the cool ___ type stars. A, F, M, K, O | M |
| ____ binary star systems are important because they allow astronomers to determine the mass and the ____ of the stars in the system. eclipsing/temp; spectroscopic/diameter; spectroscopic/temp; eclipsing/diameter; visual/temp | eclipsing/diameter |
| White dwarfs have ____ spectral lines than red giants. narrower; stronger; weaker; wider | wider |
| A parsec is a unit of measure used to describe a _____________. parallax of star; radiation energy; doppler shift; temp; distance of stars | distance of stars |
| Which method is used to determine a star’s distance? Kepler's law; doppler shift; parallax; wien's law; apparent brightness and inverse square law | parallax |
| Standard candle method is measured by ____________. speed of approaching star; surface temp; luminosity; diameter of stars; distance | distance |
Created by:
edeboo