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Chandra Light Curve
of RX J0806.3+1527
(Credit: NASA/CXC/GSFC/
T.Strohmayer)

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RX J0806.3+1527:
Orbiting Stars Flooding Space with Gravitational Waves


RX J0806.3+1527
Credit: Light curve: NASA/CXC/GSFC/T. Strohmayer; Illustration: GSFC/D. Berry

Chandra data (above, graph) from observations of RX J0806.3+1527 (or J0806), show that its X-ray intensity varies with a period of 321.5 seconds. This implies that J0806 is a binary star system where two white dwarf stars are orbiting each other (above, illustration) approximately every 5 minutes.

The short orbital period implies that the stars are only about 50,000 miles apart, a fifth of the distance from the Earth to the Moon, and are moving in excess of a million miles per hour. According to Einstein's General Theory of Relativity, such a system should produce gravitational waves -ripples in space-time - that carry energy away from the system at the speed of light.

Energy loss by gravitational waves will cause the stars to move closer together. X-ray and optical observations indicate that the orbital period of this system is decreasing by 1.2 milliseconds every year, which means that the stars are moving closer together at a rate of about 2 feet per day.

Fast Facts for RX J0806.3+1527:
Credit  Light curve: NASA/CXC/GSFC/T. Strohmayer; Illustration: GSFC/D. Berry
Category  Neutron Stars/X-ray Binaries, White Dwarfs & Planetary Nebulas
Coordinates (J2000)  RA 08h 06m 23.20s | Dec +15 27' 30.20"
Constellation  Cancer
Observation Dates  6 pointings between Jan 5, 2004 to Nov 22, 2004
Observation Time  19 hours
Obs. IDs  4523-27, 5782
Instrument  ACIS
Also Known As J0806
References T. Strohmayer, 2005 Astrophys. J. Letters (in press); see also astro-ph/0504150.
Distance Estimate  About 1,600 light years
Release Date  May 30, 2005