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Physics
Special and General Relativity
Gravitational Redshift: Units, Velocity & Ratio Explained
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[QUOTE="Zman, post: 6374059, member: 133516"] Hi, This is from Wikipedia which refers to papers and gravitational redshift in km/s; [URL]https://en.wikipedia.org/wiki/Gravitational_redshift[/URL] [SIZE=5][B]Initial observations of gravitational redshift of white dwarf stars[/B][/SIZE] A number of experimenters initially claimed to have identified the effect using astronomical measurements, and the effect was considered to have been finally identified in the spectral lines of the star [URL='https://en.wikipedia.org/wiki/Sirius_B']Sirius B[/URL] by [URL='https://en.wikipedia.org/wiki/Walter_Sydney_Adams']W.S. Adams[/URL] in 1925.[URL='https://en.wikipedia.org/wiki/Gravitational_redshift#cite_note-Hetherington1980-1'][1][/URL] However, measurements by Adams have been criticized as being too low[URL='https://en.wikipedia.org/wiki/Gravitational_redshift#cite_note-Hetherington1980-1'][1][/URL][URL='https://en.wikipedia.org/wiki/Gravitational_redshift#cite_note-Holberg2010-2'][2][/URL] and these observations are now considered to be measurements of spectra that are unusable because of scattered light from the primary, Sirius A.[URL='https://en.wikipedia.org/wiki/Gravitational_redshift#cite_note-Holberg2010-2'][2][/URL] The first accurate measurement of the gravitational redshift of a white dwarf was done by Popper in 1954, measuring a 21 km/s gravitational redshift of [URL='https://en.wikipedia.org/wiki/40_Eridani']40 Eridani[/URL] B.[URL='https://en.wikipedia.org/wiki/Gravitational_redshift#cite_note-Holberg2010-2'][2][/URL] The redshift of Sirius B was finally measured by Greenstein [I]et al.[/I] in 1971, obtaining the value for the gravitational redshift of 89±19 km/s, with more accurate measurements by the Hubble Space Telescope, showing 80.4±4.8 km/s. [/QUOTE]
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Special and General Relativity
Gravitational Redshift: Units, Velocity & Ratio Explained
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