Lecture05

Lecture05 - Previous Lecture – Stellar Spectra photon...

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Unformatted text preview: Previous Lecture – Stellar Spectra photon energy: E = h f = h c / λ atomic structure and energy levels photon absorption and emission stellar spectral classification: OBAFGKM based on absorption lines, related to temperature the HR diagram structures: main sequence, giants, white dwarfs stellar sizes luminosity classes spectroscopic parallax Binary Stars About half the stellar objects in the Galaxy are multiple stars usually binary, but also triples, quadruples, … Classes of binary stars optical double: projection, not true binary visual binary: see two stars, orbiting about each other Types of Binary Stars astrometric binary: see one star, oscillating back and forth periodically spectroscopic binary: detect periodic velocity variation from Doppler effect single line: see the spectrum of one object double line: see two spectra, with opposite motions Types of Binary Stars eclipsing binary: stars’ orbital plane is in our line of sight, so we see periodic eclipses interacting binary:...
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This note was uploaded on 01/31/2012 for the course 750 110 taught by Professor Ericgawaiser during the Fall '10 term at Rutgers.

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Lecture05 - Previous Lecture – Stellar Spectra photon...

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