Sirius' White Dwarf Companion Weighed by Hubble

[Fraser]

SUMMARY: The brightest star in the nighttime sky is Sirius, aka the Dog Star. But did you know it has a white dwarf companion called Sirius B? Unfortunately, the light from this burned out star is washed out by Sirius' brilliant glow. Astronomers have been able to use the Hubble Space Telescope's sensitive instruments to isolate the light from Sirius B and measure its mass by how its gravity bends light emitted from the star. Even though it's only 12,000 kilometers (7,500 miles) across, Sirius B has 98% of the mass of our Sun.

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[R.A.F.]

ToSeeked! (http://www.bautforum.com/showthread.php?t=35900)

[Shea]

Astronomers have been able to use the Hubble Space Telescope's sensitive instruments to isolate the light from Sirius B and measure its mass by how its gravity bends light emitted from the star.

Hi Fraser,
In the summary, the word "bends light" is used. I suppose it is not suitable, because measurement of redshift is the way to measure the mass of Sirius B. Although they are both relativistic effects, they are different in phenomenally.

Good luck.