4_-_Stellar_Temperatures - 4 Stellar Temperatures OBAFGKM...

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4 – Stellar Temperatures O±–B±–A±–F±–G±–K±–M and L – T - Y Max Planck Max Planck 1910 2 The Plan (Ch2.1) • Stellar Properties (setting the stage) – Temperature (Planck Function) – Mass (Kepler problem) – Composition (spectroscopy) – Lifetimes (Bethe and Salpeter) • Stars as Blackbodies • Stars as Generators of heavy elements • Stellar distances and the parsec 3 The Big Picture • The nearest star is the Sun! It is by far the largest, hottest and most massive component of the solar system. • Compared to other stars it is a bit more massive than the average at a mass of 2.0x10 33 g. The highest mass stars have masses of ~40M o . The lowest mass stars have masses of, ~0.1M o • The luminosity of the Sun, L o , is 3.8x10 33 erg/s. • The age of the Sun, is ~5x10 9 yrs. (It’s a good idea to remember the values of L o and M o !) 4 While we’re at it… • The surface temperature is 5780K and the core temperature is ~16x10 6 K.
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This note was uploaded on 04/05/2009 for the course ASTRO 3332 taught by Professor Houck,j during the Spring '09 term at Cornell University (Engineering School).

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4_-_Stellar_Temperatures - 4 Stellar Temperatures OBAFGKM...

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