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Astronomy105

Exercise 10: Brightness and Color of Stars

QuestionAnswer
The apparent brightness (___________) of a star is the first step to finding its intrinsic brightness, or _____________. apparent magnitude, Luminosity
______________ tells us what the energy output of the star is. Luminosity
What is the ultimate source of energy for the vast majority of the stars we study? Nuclear reactions
The _____ of a star is related to the temperature of the star. color
The color of a star is related to the ___________ of the star. temperature
__________ is another basic characteristic that enables us to determine the conditions in the atmosphere of the star. temperature
_________ is another basic characteristic that enables us to determine its chemical composition. temperature
__________ is another basic characteristic that enables us to determine information to feed in to computer models that characterize the entire structure of the star. temperature
Apparent magnitudes and _________ are usually measured with photometers or CCD cameras and filters. colors
____________ and colors are usually measured with photometers or CCD cameras and filters. apparent magnitudes
Apparent magnitudes and colors are usually measured with __________ or CCD cameras and filters. photometers
apparent magnitudes and colors are usually measured with photometers or ___________ and filters. CCD cameras
apparent magnitudes and colors are usually measured with photometers or CCD cameras and ____________. filters
Our goal is to use a_______ precise detector, the eye, to get some idea of the apparent brightness and colors of some bright stars. less
Our goal is to use a less precise _________, the eye, to get some idea of the apparent brightness and colors of some bright stars. detector
Our goal is to use a less precise detector, the eye, to get some idea of the _____________ and colors of some bright stars. apparent brightness
Our goal is to use a less precise detector, the eye, to get some idea of the apparent brightness and ___________ of some bright stars. colors
Our goal is to use a less precise detector, the eye, to get some idea of the apparent brightness and colors of some ________stars. bright
___________ is the logarithmic measure of the brightness of an object. magnitude
magnitude is the ____________ measure of the brightness of an object. logarithmic
magnitude is the logarithmic measure of the ____________ of an object. brightness
magnitude is the logarithmic measure of the brightness of an __________. object
_________________ is a measure of an objects luminosity; defined to be the apparent magnitude the object would have if it were located exactly 10 parsecs away. Absolute magnitude
Absolute magnitude is a _________ of an objects luminosity; defined to be the apparent magnitude the object would have if it were located exactly 10 parsecs away. measure
Absolute magnitude is a measure of an objects __________; defined to be the apparent magnitude the object would have if it were located exactly 10 parsecs away. luminosity
Absolute magnitude is a measure of an objects luminosity; defined to be the ___________ the object would have if it were located exactly 10 parsecs away. apparent magnitude
Absolute magnitude is a measure of an objects luminosity; defined to be the apparent magnitude the object would have if it were located exactly ___________ away. 10 parsecs
_________ is the total power output of an object, usually measured in watts or in units of solar luminosities. Luminosity
Luminosity is the ________________ of an object, usually measured in watts or in units of solar luminosities. total power output
luminosity is the total power output of an object usually measured in _______ or in units of solar luminosities. watts
luminosity is the total power output of an object usually measured in watts or in units of _______________________. solar luminosities
_____________ is directly related to the magnitude of a star. luminosity
luminosity is directly related to the ____________ of a star. magnitude
____________ is based on the amount of energy a star is putting out compared to our sun. luminosity
luminosity is based on the amount of _________ a star is putting out compared to our sun. energy
luminosity is based on the amount of energy a star is putting out compared to our __________. sun
luminosity is based on the _________ of energy a star is ________ compared to our sun. amount, putting out
____________ is a simple numerical expression that determines the color of an object, which in the case of a star gives its temperature. color index
color index is a simple ___________ expression that determines the color of an object, which in the case of a star gives its temperature. numerical
color index is a simple numerical expression that determines the ________ of an object, which in the case of a star gives its temperature. color
color index is a simple numerical expression that determines the color of an object which in the case of a star gives its ____________. temperature
____________ is a category for classifying a star according to features of its spectrum that indicates its surface temperature and chemical composition. spectral type
spectral type is a ____________ for classifying a star according to features of its spectrum that indicates its surface temperature and chemical composition. category
spectral type is a category for ________ a star according to features of its spectrum that indicates its surface temperature and chemical composition. classifying
spectral type is a category for classifying a star according to __________ of its spectrum that indicates its surface temperature and chemical composition. features
spectral type is a category for classifying a star according to features of its _________ spectrum that indicates its _____________ temperature and chemical composition. spectrum, surface
spectral type is a category for classifying a star according to features of its spectrum that indicates its surface temperature and _____________. chemical composition
___________ is a graph in which the absolute the absolute magnitude of stars is plotted vertically against their surface temperatures. H-R diagram
H-R diagram is a graph in which the _________________ of stars is plotted vertically against their surface temperatures. absolute magnitude
H-R diagram is a graph in which the absolute magnitude of stars is plotted _____________ against their surface temperatures. vertically
H-R diagram is a graph in which the absolute magnitude of stars is plotted vertically against their ____________. surface temperatures
What shows a shows a strong correlation between luminosity and surface temperature among the average sized stars known as dwarfs? H-R Diagram
H-R Diagram shows a strong ____________ between luminosity and surface temperature among the average sized stars known as dwarfs. correlation
H-R Diagram shows a strong correlation between ___________and _____________among the average sized stars known as dwarfs. luminosity,surface temperature
H-R Diagram shows a strong correlation between luminosity and surface temperature among the average sized stars known as_________. dwarfs
H-R Diagram shows a strong correlation between luminosity and surface temperature ________ the average sized stars known as dwarfs. among
________________ is a diagonal band on the Hertzsprung Russell diagram containing about 90% of all known stars, stars evolve onto and then off the band during their life time Main Sequence
What does H-R stand for? Hertzsprung Russell
Main Sequence is a diagonal band on the Hertzsprung Russell diagram containing about ________ of all known stars, stars evolve onto and then off the band during their life time 90%
Main Sequence is a diagonal band on the Hertzsprung Russell diagram containing about 90% of all known stars, stars ________ onto and then off the band during their life time evolve
A _______________ is a very large, bright non-main-sequence star that burns hydrogen at a much faster rate than a dwarf star. giant star
Giant stars are much more _______________ and have ____________ lifespans than the slower-burning dwarfs. The larger the giant, the shorter its lifespan. luminous, shorter
A giant star is a very large, ________ non-main-sequence star that burns __________ at a much faster rate than a dwarf star. bright, hydrogen
Giant stars are much more luminous and have shorter lifespans than the slower-burning _________. The larger the giant, the shorter its lifespan. dwarfs
A giant star is a very large, bright non-main-sequence star that burns hydrogen at a much faster rate than a __________star. dwarf
Giant stars are much more luminous and have shorter lifespans than the slower-burning dwarfs. The larger the _______, the shorter its __________. giant, lifespan
A ________________ star is a star that is larger, brighter, and more massive than a giant star, being thousands of times brighter than the sun and having a relatively short lifespan. 10-50 million year lifespan. Supergiant
A Supergiant Star is a star that is larger, brighter, and more _________ than a giant star, being thousands of times brighter than the sun and having a relatively short lifespan. 10-50 million year lifespan. massive
A Supergiant Star is a star that is larger, brighter, and more massive than a giant star, being ________ of times brighter than the sun and having a relatively short lifespan. 10-50 million year lifespan. thousands
A Supergiant Star is a star that is larger, brighter, and more massive than a giant star, being thousands of times brighter than the sun and having a relatively _________ lifespan. 10-50 million year lifespan. short
A Supergiant Star is a star that is larger, brighter, and more massive than a giant star, being thousands of times brighter than the sun and having a relatively short lifespan. 10-50 _________ year lifespan. million
To check to see how good you are at ranking the stars, write down the __________ (MK Type) from the HR Diagram Data table in the spreadsheet for each star in table 10.1. spectral type
To check to see how good you are at ranking the stars, write down the spectral type (MK Type) from the ____________ Data table in the spreadsheet for each star in table 10.1. H-R Diagram
To check your ability to rank in ______________, write down from the HR Diagram Data table the apparent visual magnitude V, of each star in Table 10.2. Brightest is V = -1.5, which is brighter than V = 0, which is brighter than V = 1, etc. brightness
To check your ability to rank in brightness, write down from the HR Diagram Data table the apparent _____________ V, of each star in Table 10.2. Brightest is V = -1.5, which is brighter than V = 0, which is brighter than V = 1, etc. visual magnitude
To check your ability to rank in brightness, write down from the HR Diagram Data table the apparent visual magnitude V, of each star in Table 10.2. Brightest is V = ________, which is brighter than V = 0, which is brighter than V = 1, etc. -1.5
If all the stars you observe were the same size, than the one that would be most luminous would be the one that is ________ and puts out more _________. hotter, energy
If all the stars you observed were located at the same distance from the sun, the stars that would be the most luminous would be really _______ stars because they have more_________ and they put out more_________ than smaller stars. There bigger stars. big, surface area, energy
The ____ line on the plot is the Zero _____ Main _______ (ZAMS), which represents the sequence of all stars when they first start burning ________ in their cores. blue, age, sequence, hyrdrogen
Created by: 1143643238