AST201H1 Chapter Notes -Electrical Equipment In Hazardous Areas, Subgiant, Giant Star
9 May 2013
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AST201H1 Full Course Notes
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Stellar parallax (p) the small apparent shift in position of a nearby star relative to distant background objects due to earth"s orbital motion. Parsec (pc) distance to hypothetical star whose parallax is 1 second of arc. Intrinsic brightness a measure of amount of light that a star produces. Flux measure of flow of energy out of surface, usually applied to light. Absolute visual magnitude (mv) intrinsic brightness of a star the apparent visual magnitude the star would have if it were 33ly away. Luminosity (l) total amount of energy a star radiates per second at all wavelengths. To find distance of a star from earth, use baseline as the size of earth"s orbit (1au) Stellar parallax the angle representation of stars in arc seconds due to very far distance, technically, half the total shift of star or shift seen across baseline of 1au. Measuring parallax is difficult due to very small angle.
