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Examples
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Using his own telescope, Friedman captured a highly detailed photograph of our solar system's star using a filter to capture Hα (H-alpha) light waves, which Discover Magazine defines as "the light of Hydrogen."
Detailed Pictures Of The Sun Let You Get Up Close And Personal With The Star (PHOTOS) The Huffington Post 2010
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Using his own telescope, Friedman captured a highly detailed photograph of our solar system's star using a filter to capture Hα (H-alpha) light waves, which Discover Magazine defines as "the light of Hydrogen."
Detailed Pictures Of The Sun Let You Get Up Close And Personal With The Star (PHOTOS) The Huffington Post 2010
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You are probably thinking of the atmospheric water vapour A and B bands, a bit redwards from H-alpha.
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Then, using the new HAWK-I camera, attached to another VLT Unit Telescope, they surveyed the same area of space for light emitted at a different wavelength, also by glowing hydrogen, and known as the H-alpha line.
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This effect is dramatically more significant for Lyman-alpha than for H-alpha light.
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The strongest green line is Mg I, the strong yellow line is the sodium D line actually two close-together lines called D1 and D2and the strong red line is H-alpha.
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It is based on images acquired using three different broadband filters (B, V, R) and one narrow-band filter (H-alpha).
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The spectrum of this object also shows H-alpha and the strong Ca II infrared triplet in emission.
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A spectrum (range 350-900 nm), taken with the SMARTS 1.5-m telescope at Cerro Tololo, on November 17, shows H-alpha in emission, all other Balmer lines and He I (at 501.5 nm) in absorption, and a very strong Ca II infrared triplet in emission, confirming it to be a young stellar object.
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The image was made from data obtained through four different filters B, V, R, and H-alpha.
Straight From the Island of Misfit Galaxies: Barnard | Universe Today 2009
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