Observational techniques meeting #8. Filter systems.

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Observational techniques meeting #8

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Transcript of Observational techniques meeting #8. Filter systems.

Page 1: Observational techniques meeting #8. Filter systems.

Observational techniquesmeeting #8

Page 2: Observational techniques meeting #8. Filter systems.

Filter systems

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Johnson system

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SDSS system (Gunn filters)

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IR filters

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Narrow-band filters

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More…

>215 systems …

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Spectrographs

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Dispersive elements: prism

High throughput; low resolution; wavelength-dependant dispersionR=t dn/dλ

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Dispersive elements:diffraction grating

R = m L k

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Dispersive elements:grism

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Dispersive elements:reflection grating

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Cross-dispersed echelle

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Slitless spectroscopy

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Spectrograph

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MultiplexingMultislit masks

Fiber spectrographs

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LAMOST

3.5-4.9m mirror4000 fibers16 spectrographsXinglong station

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End


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