The gravitational redshift of Sirius B
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Previous measurements of the gravitational redshift of Sirius B have resulted in a mass estimate which is significantly larger than the mass measured from the binary orbit. We have obtained new HST observations of Sirius A and B in Cycle 25 which were used to make a differential measurement of the WD gravitational redshift. We measure a redshift of 80.65 +- 0.77 km s-1 which, when combined with the radius, gives a mass of 1.017 +- 0.025 M . The new result is in agreement with the dynamical mass and the predictions of a C/O white dwarf mass-radius relation with a precision of 2.5 per cent.
The 21st European Workshop on White Dwarfs was held in Austin, TX from July 23rd to 27th of 2018