SPECTRAL CLASSES FOR MAIN SEQUENCE STARS
| Characteristics of Spectral Classes for Main Sequence Stars | Class | Color | Surface Temperature | Strong Lines | | O | blue-white | 35,000 degrees Celsius | ionized helium | | B | blue-white | 21,000 degrees Celsius | helium | | A | white | 10,000 degrees Celsius | hydrogen | | F | creamy | 7,000 degrees Celsius | ionized calcium | | G | yellow | 6,000 degrees Celsius | calcium | | K | orange | 4,500 degrees Celsius | titanium oxide | | M | red | 3,000 degrees Celsius | titanium oxide | ____________________The Columbia Encyclopedia, Sixth Edition Copyright© 2004, Columbia University Press. Licensed from Lernout & Hauspie Speech Products N.V. All rights reserved. -44860- | |
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