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### 26 Cards in this Set

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