This NASA Hubble Space Telescope image of planetary nebula NGC 7027 shows remarkable new details of the process by which a star like the Sun dies.
New features include: faint, blue, concentric shells surrounding the nebula; an extensive network of red dust clouds throughout the bright inner region; and the hot central white dwarf, visible as a white dot at the center.
The nebula is a record of the star's final death throes. Initially the ejection of the star's outer layers, when it was at its red giant stage of evolution, occurred at a low rate and was spherical. The Hubble photo reveals that the initial ejections occurred episodically to produce the concentric shells. This culminated in a vigorous ejection of all of the remaining outer layers, which produced the bright inner regions. At this later stage the ejection was non-spherical, and dense clouds of dust condensed from the ejected material.
The results are being presented by astronomers Howard Bond, Karen Schaefer, and Laura Fullton of the Space Telescope Science Institute, and Robin Ciardullo of Pennsylvania State University, at the 187th meeting of the American Astronomical Society in San Antonio, Texas. "When we saw the Hubble photograph of the nebula NGC 7027, we were astounded by the exquisite wealth of detail that nobody had ever seen before," said Bond.
The photograph was taken as part of a survey of planetary nebulae, which are clouds of gas and dust ejected from a star with a mass similar to that of the Sun as it reaches the end of its life. NGC 7027 is located about 3,000 light-years from Earth in the direction of the summer constellation Cygnus.
When a star like the Sun nears the end of its life, it expands to more than 50 times its original diameter, becoming a red giant star. Then its outer layers are ejected into space, exposing the small, extremely hot core of the star, which cools off to become a white dwarf. Although stars like the Sun can live for up to 10 billion years before becoming a red giant and ejecting a nebula, the actual ejection process takes only a few thousand years.
The NGC 7027 photograph is a composite of two Hubble images, taken in visible and infrared light, and is shown in "pseudo-color."
Credits
H. Bond (STScI) and NASA| About The Object | |
|---|---|
| Object Name | NGC 7027 |
| R.A. Position | 21h 7m 1.58s |
| Dec. Position | 42° 14' 10.2" |
| About The Object | |
|---|---|
| Object Name | A name or catalog number that astronomers use to identify an astronomical object. |
| Object Description | The type of astronomical object. |
| R.A. Position | Right ascension – analogous to longitude – is one component of an object's position. |
| Dec. Position | Declination – analogous to latitude – is one component of an object's position. |
| Constellation | One of 88 recognized regions of the celestial sphere in which the object appears. |
| Distance | The physical distance from Earth to the astronomical object. Distances within our solar system are usually measured in Astronomical Units (AU). Distances between stars are usually measured in light-years. Interstellar distances can also be measured in parsecs. |
| Dimensions | The physical size of the object or the apparent angle it subtends on the sky. |
| About The Data | |
| Data Description |
|
| Instrument | The science instrument used to produce the data. |
| Exposure Dates | The date(s) that the telescope made its observations and the total exposure time. |
| Filters | The camera filters that were used in the science observations. |
| About The Image | |
| Image Credit | The primary individuals and institutions responsible for the content. |
| Publication Date | The date and time the release content became public. |
| Color Info | A brief description of the methods used to convert telescope data into the color image being presented. |
| Orientation | The rotation of the image on the sky with respect to the north pole of the celestial sphere. |
