Astro 10BH Week 8 Reading - ASTRO 10BH FRAKNOI WEEK 8...

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Astronomy 10BH Week 8Ch. 10 Celestial Distances10.2 Surveying the StarsFor stars that are relatively nearby, we can “triangulate” the distance from a baselinecreated by the earth’s annual motion around the sunHalf the shift in a nearby star’s location, relative to background stars, as viewed fromopposite sides of the Earth’s orbit, is called theparallaxof that star and is a measureof that distancethe units used to measure stellar distance are thelightyear(LY), the distance lighttravels in one year, and theparsec(pc), the distance of the star with a parallax of1 arcsec (1 parsec = 3.26 LY)10.3 Variable Stars: One Key to Cosmic DistancesCepheidsandRR Lyraestars are two types ofpulsating variable starslights curvesof these stars show that their luminosities vary with a regularlyrepeating periodboth types of variables obey aperiod-luminosity relation, so measuring theirperiods can tell us their luminositiesCh. 13 Stars: From Adolescence to Old Age13.2 Star Clusters

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Term
Summer
Professor
N/A
Tags
Astronomy, Globular cluster

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