1 / 5

Star Characteristics

Star Characteristics. 19.1. Star Classification. Color and Temperature – Color is a reflection of the surface temperature of stars Blue or blue-white - hottest; White; Yellow – average like our sun; Red –orange; Red - coolest B lue w hales y ell o n r ocks (order H to C)

lovie
Download Presentation

Star Characteristics

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Star Characteristics 19.1

  2. Star Classification • Color and Temperature – Color is a reflection of the surface temperature of stars • Blue or blue-white - hottest; White; Yellow – average like our sun; Red –orange; Red - coolest • Blue whales yell on rocks (order H to C) • Size – affects brightness; Largest are brightest • Super Giant, Giant, Main sequence, dwarf (L to Sm) • Chemical composition – The spectrograph of a star shows what gases besides, Hydrogen and Helium are present

  3. Brightness • Apparent magnitude– brightness of the star as seen from Earth. Proximity or closeness affects apparent brightness • Absolute magnitude– The amount of light given off by the star and is affected by color, temperature, size, and chemical composition.

  4. Measuring distances to stars • Light year – The distance light travels in one year. ( about 9.5 trillion km ) • Parallax – apparent shift of an object when it is viewed from two different positions. • Parallax is used to measure the distance of nearby stars. Mathematical calculation • When using parallax, the further the distance the greater the apparent shift in position

  5. Hertzsprung- Russell Diagram • H-R diagram • Compares the Absolute magnitude of stars with the surface temperature of the star. • Main sequence stars make up more than 90% of all stars. They fuse H to He • Hottest stars appear towards the L and coolest are at R. • The brightest stars are near the top and the dimmest stars are near the bottom of the HR diagram • Giants and super giants fuse He to C.

More Related