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26 Cards in this Set
- Front
- Back
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Magnitudes (brightness)
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the lower the mag. the brighter. The difference of 5 magnitudes is 100x. so from 10 mag to 15 mag. it would be 100x
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Which one is the brightest? and which one is the dimmest?
(-1.6, 3.5, 3.9, 6.9) |
-1.6 is the brightest. and 6.9 is the dimmest
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Apparent Magnitude (m)
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Is the brightness of a star in Earth's sky measured with a photometer.
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Absolute Magnitude (M)
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Is the brightness of a star if the star was 10 parsecs (32.6LY)
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What is the closet star from the sun?
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the Alpha Centauri (approx 4 light years)
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What is stellar parallax?
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it determines the distance of the closest stars less than 20 pc
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what does stellar parallax use?
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it uses the orbit of the Earth (2 AU) as a "baseline"
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When can the distance be determined?
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When Using the half-angle (p in arc seconds) and Trigonometry
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1 Parsec = ?
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1 parsec = 3.26 Light Years
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Light year =
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186,000 mi/sec x 60sec/min x 60min/hr x 24hrs/day x 365.25day/yr
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What is also a light year?
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Is an astronomical Distance (not time) Approx 6 trillion Miles
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What does the Spectroscopic parallax determine?
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it determines the distance of Farther stars using apparent magnitude, and the absolute mag. using a spectrometer and a H-R diagram. And the distance modulus (D=m-M)
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Spectral Classes
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O B A F G K M
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On an H-r diagram....
What is the hottest |
O; Bottom left
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On a H-r diagram....
What is the coolest? |
M; Bottom right
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On an H-r diagram....
What is the brightest? |
the very top
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On an H-r Diagram....
What is the dimmest? |
The very Bottom
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characteristics of a White dwarf is...
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Hotter and Dimmer
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Characteristics of a Red Giant.
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Brighter and cooler
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Luminosity classes:
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I: Superior Giants
II: Extreme Giants III: Giants IV: Sub Giants V: Main Sequence. |
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russel-Vogt Theorem:
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Properties of a star depends on MASS and chemical composition.
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Our sun is a main sequence Star...
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Our SUN is a Main Sequence Star, lasts there for 10 Billion years and uses up 0.7 of its mass into energy
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Proto Star =
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T-tauri
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Process of the death of a Star...
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Red Giant - helium Flash- Planetary Nebula- White Dwarf
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What allows determination of MASS
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BINARY STARS
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Which is not a star cluster type?
Open, O.B Clusters, Closed Clusters, Globular Clusters, Galactic Clusters? |
NO Closed Clusters
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