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Astro Final Questions
Terms in this set (33)
If one star is 1st Magnitude and another star is 6th Magnitude. Which is brighter and how much?
1st star is 100x brighter
Stellar Parallax is important because it allows the determination of
Which of the planets will be most accurate to determine stellar parallax?
The furthest planet from the sun
Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune
What is the distance of the closest star besides our sun?
Alpha Centauri: 4 LY
A Parsec is how many LY?
The HR diagram is a graph of what?
Luminosity vs. Temp (or color)
Or, Abs M vs. Spectral class
Stars on HR diagram
Roman Numeral V: similar to our sun
Our sun: G2V
According to the Russell-Vogt Theorem, what determines the properties of a star?
Mass and chemical composition
When a Stars spectral and luminosity Class is known, we can find the Abs M using the HR diagram. What else is needed?
Which method for finding distance?
Binary stars are particularly important for the determination of...
How much mass is lost during the suns useful lifetime on the main sequence?
Which is not a class of clusters?
Stars in upper left end in Main Sequence, next become what?
All stars on main sequence next become red giants
Main Sequence Cut off is useful to determine a star's...
Stars in the process of formation is called what?
T-Tauri Stars (protostar)
Hydrogen burning from a solar like star lasts?
10 billion years
Stellar remnants of a solar type (or sun like) star is a...
Most massive stars end up as...
Heavy elements from which new stars are born is created by...
A sphere around a black hole where light cannot escape
The Solar System is located within the galactic...
The period of revolution of the Sun going around the Galactic center is...
250 million years
21 cm radiation (or wavelength) is important because ...
The local group of Galaxies contains
Small and Large Magellanic Clouds
Which is not true about Pop I stars
Can be found extensively in Elliptical galaxies
False because Elliptical has only Pop 2
Our galaxy has spiral density waves which causes...
Produces illusion of Spiral arms
Triggers Star formation
Possible cause of "Ice Ages" on earth
Generated from external nearby galaxies
Chart of various types of galaxies
Hubble Tunning Fork
Which type of galaxies have no star formation in present time?
Galaxies were thought to be something else until 1920
Which is NOT true about globular clusters?
They are located in galactic disc
False because they are in halo
Pulsars are known to be what?
If we turn our telescope to a point in the sky where there was a Supernova in 1054 AD, what would we see now?
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