Facts about Binary Stars
- 10
Spectroscopic binary stars are identified by the periodic Doppler shifting of their spectral lines as each star alternately moves toward and away from Earth.
- 09
Gravitational waves were first directly detected in 2015 from two merging black holes, but binary neutron star mergers also produce detectable gravitational wave signals as they spiral inward.
- 08
Beta Lyrae represents an eclipsing binary system where both stars are so close they distort into egg shapes, orbiting every 12.9 days while mass continuously transfers between them.
- 07
Two stars orbiting so close they touch create a contact binary system, with mass flowing between them through a bridge of material called the Roche lobe overflow.
- 06
In 1995, astronomers discovered that the binary star system AR Cassiopeiae contains two massive O-type stars orbiting each other every 3.6 days, producing powerful stellar winds that collide and generate X-rays.
- 05
X-ray observations reveal that Cygnus X-1, a black hole binary system discovered in 1964, strips material from its companion blue supergiant star at rates exceeding one million tons per second.
- 04
Approximately 50 percent of all stars in the Milky Way exist as binary or multiple star systems, making single stars like our Sun the minority configuration in the galaxy.
- 03
Mizar and Alcor, two stars in the Big Dipper's handle separated by 11 arcminutes, form a binary system orbiting their common center of mass every 10,000 years.
- 02
Algol in Perseus undergoes eclipses every 2.87 days as its dimmer companion star passes in front of it, causing brightness variations visible to the naked eye.
- 01
The Sirius system contains a white dwarf companion star only 8.6 light-years from Earth, orbiting its primary star every 50 years.