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Definitions |
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The relationship of variable period the absolute luminosity in Cepheid Variables was established by ?
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Henrietta Leavitt
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The sun is a population 2 star
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false
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how do we know the age of star clusters
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HR diagram analysis
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Relection nebulae scatter photons and generally appear?
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blue ish
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the sky appears blue because of ___ ?
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Rayleigh scattering
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dust (non-hyrdogen,non helium) makes up ___ of the interstellar medium
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about 1%
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where do the globular cluster reside
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within the Galactic Halo
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For the amount of luminous matter that we see in our galaxy, the milky way is rotating too fast
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true
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The difference between H1 region and an H2 region is ___.
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all the above.
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the turn off mass can be used to tell us the
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the age of the cluster
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The determination of which red frequencies pass through a gas/dust cloud and which blue frequencies are scattered or absorbed?
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is a function of the dominant dust particle size within the cloud
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where do the open clusters reside
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within the disk of the galaxy
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The first hint of the size and structure of our galaxy was provided by ____.
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The locations of the globular clusters
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why cant we see the structure of the milky way
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opaque material within the galaxy blocks our view
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Observable stars and star groupings in other galaxies are ___.
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massive main sequence stars and supergiants
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Halo stars and globular clusters have orbits around the milky way ___.
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Have elliptical orbits that carry them above or below the galactic plane
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The best evidence that there is a massive Black at the center of our galaxy is
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Infrared images of stars near the center of the galaxy moving very rapidly
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Star clusters occur in 2 broad categories
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young and old
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What causes the pulsation o a Cepheid-type variable star?
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a layer of helium within the star that becomes ionized
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our sun is located
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2/3rds of the way out from the center, within the disk
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the most significant difference b/t globular clusters and other clusters types is ___.
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the old age of the stars in the globular cluster
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Population 1 stars are all older than population 2 stars.
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false
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the interstellar medium is gradually becoming
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enriched with heavier nuclei
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what is the turn off mass
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the most massive luminosity class V in a cluster
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Stars orbiting within the disk of the milky way have orbits?
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Have circular orbits that wavier up and down through the disk
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What characteristic of Cepheid variable stars makes them useful in calculating their distance?
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The period of their variability is directly related to their absolute luminosity
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the stars in open clusters in the milky way
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started formation at the same time and in the same general region
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The primary difference for population 1 and population 2 stars is
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The metallicity of the star
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Recent studies of the Andromeda Galaxy have shown ________ .
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a large number of metal-poor Red Giant stars in the halo out to a distance of 500,000 LYr
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Why does star formation seem to taking place primarily within the spiral arms of the galaxy?
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a. the differential rotation of the galaxy collects the free Hydrogen into Giant Molecular Clouds within the arms
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