Homework 8: Properties of Stars
When the absorption lines of Star B are blueshifted
Star A is moving away from the observer.
A star that is distant has___________parallax compared to a nearby star.
smaller
The star's absolute magnitude would
stay the same
Which star has a higher surface temperature?
Star B
Use the provided chart to answer the question. Consult the electromagnetic spectrum as needed. A star with which of the blackbody spectra emits the highest proportion of its light in the orange part of the spectrum?
Star C
If Star C is intrinsically radiating more light than Star D, which statement must be true?
Star C has a higher luminosity than Star D.
At which location on the Hertzsprung-Russell diagram would you expect to find a low mass main sequence star?
D
Two stars have the same radius. If star A has a larger luminosity than star B, then
star A has a hotter surface temperature.
A main‑sequence star of spectral type O9 and a white dwarf star with a spectral type of O9 must have the same____________must have different____________and could have either the same or different___________.
temperatures luminosities parallaxes
An eclipsing binary is defined as a binary star system in which
the stars, viewed from Earth, pass directly in front of each other as they orbit the system's center of mass, resulting in periodic dips in brightness.
Which color would characterize a G star?
yellow
As viewed from Earth, a star of magnitude 3 appears____________ a star of magnitude 4.
brighter than
Astronomers determine stellar masses by
calculating them from the orbits of binary stars
If the distance to a star somehow decreased, its apparent magnitude would
decrease
Which point is the hottest star?
point A
The graph plots two properties of stars, temperature and luminosity. The data from 12 stars is plotted on the graph.Which point is the brightest star?
point F
Fill in the blanks in the statements about parallax. As the distance to an object increase the observed parallax(1)____________. A parsec is defined as the distance to an object when(2)____________ is equal to one parsec. When parallax is 0.1 arc seconds, the distance is(3)_____________.
1)increase. 2)parallax 3)10 parsec
A star has an apparent magnitude of 1.1 and an absolute magnitude of 1.1. The distance to this star is
10 parsecs.
If the same object were 4 times closer, then the intensity would be
16 times larger
The intensity of many quantities (like the strength of gravity and the brightness of light) changes according to an inverse square law. Consider an object that is the source of an observed intensity (such as either gravity or brightness). If the same object were 4 times farther away, then the intensity would be
16 times smaller
Four main sequence stars are shown on the Hertzsprung-Russell diagram. Which star has the highest mass?
A
Four main sequence stars are shown on the Hertzsprung-Russell diagram.Which star is the most blue?
A
Star A has a similar radius and luminosity as the Sun. Star B has the same radius as star A but is 1,000 times more luminous. What is the color of star B?
Blue
Place the constellations, asterisms, and stars into the correct categories. You are currently in a sorting module. Turn off browse mode or quick nav, Tab to items, Space or Enter to pick up, Tab to move, Space or Enter to drop. Constellations Asterisms Stars
Constellations: -orion -draco -ursa minor -libra Asterisms: -orion's belt -big dipper Stars: -Arcturus -Aldebaran -Orionis
Stars can be classified according to their spectral type, and these spectral types can be arranged in a temperature sequence. Rank the seven main spectral types from hottest to coolest.
Hottest to coldest: O, B, A, F, G, K, M
If Star A appears equally as bright as Star B as observed from Earth, which statement must be true?
None of these statements must be true
Color is one of the most useful tools in astronomy. Sort the statements concerning visible light from red and blue stars as either true or false.
TRUE: -Red light has a shorter wavelength than blue. -Hot star look red than cool star. -Red star preferentially reflect red light. FALSE: -Blue stars radiate like blackbodies. -Blue stars are hot than red stars. -When the wavelength of peak emission occurs in the blue part of the visible spectrum, a star will appear blue.
Consider the image. The stars in the Antlia dwarf galaxy are all the same distance from Earth.If one star has an intrinsic luminosity of 0.5 Lsun and a second star has an intrinsic luminosity of 5.8 Lsun , which star appears brighter in the night sky?
The second star will appear brighter
