NASA's Hubble Space Telescope has snapped a photograph of a strange object that looks a bit like a hamburger. The object, nicknamed Gomez's Hamburger, is a Sun-like star nearing the end of its life.
Gomez's Hamburger was discovered on sky photographs obtained by Arturo Gomez, an astronomer at the Cerro Tololo Inter-American Observatory in Chile. It is about 6,500 light-years away.
The central star has expelled large amounts of gas and dust and is on its way to becoming a colorful, glowing object called a planetary nebula. These objects were misnamed early on in the history of telescope astronomy because their fuzzy appearance resembled the gas giant planets of our solar system.
The ingredients for the giant celestial hamburger are dust and light. The hamburger buns are light reflecting off dust and the patty is the dark band of dust in the middle.
The Hubble Heritage image, released today, was taken Feb. 22, 2002, with the Wide Field Planetary Camera 2. It shows the structure of Gomez's Hamburger with high resolution, particularly the striking dark band of dust that cuts across the middle. The dark band is actually the shadow of a thick disk around the central star, which is seen edge-on from Earth.
The star itself, with a surface temperature of approximately 18,000 degrees Fahrenheit (10,000 degrees Celsius), is hidden within this disk. However, light from the star does emerge in the directions perpendicular to the disk and illuminates dust above and below it.
The reason why the star is surrounded by a thick, dusty disk remains somewhat uncertain. It is possible that the central object is actually a pair of stars. If so, then the star that ejected the nebula may be rapidly rotating, expelling material mostly from its equatorial regions.
Stars with masses similar to our Sun's end their lives as planetary nebulae. The star evolves to become a bloated red giant, with a girth about 100 times greater than its original diameter. Then it ejects its outer layers into space, exposing the star's hot core. Ultraviolet radiation from the central core streams out into the surrounding ejected gas, causing it to glow. The glowing gas is called a planetary nebula.
Gomez's Hamburger is considered a proto-planetary nebula. Just after the red giant expels its outer layers, the remnant star in the center is still relatively cool. Consequently, it emits ordinary visible light, but not yet any ultraviolet radiation. Therefore, the surrounding gas does not glow.
However, the ejected material also contains vast numbers of microscopic dust particles, which can reflect the starlight and make the material visible. This same effect of "light scattering" produces halos around streetlights on a foggy night.
The lifetime of a proto-planetary nebula is very brief. In less than a thousand years, astronomers expect that the central star will become hot enough to make the dust particles evaporate, thus exposing the star to view. At that time, the surrounding gas will glow. Gomez's Hamburger will have become a beautiful, glowing planetary nebula.
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