Hubble eyes a smoldering star

Hubble eyes a smoldering star
Credit: ESA/Hubble & NASA

(Phys.org) —This new image, snapped by NASA/ESA Hubble Space Telescope, shows the star HD 184738, also known as Campbell's hydrogen star. It is surrounded by plumes of reddish gas—the fiery red and orange hues are caused by glowing gases, including hydrogen and nitrogen.

HD 184738 is at the center of a small . The star itself is known as a [WC] star, a rare class resembling their much more massive counterparts—Wolf-Rayet stars. These stars are named after two French astronomers, Charles Wolf and Georges Rayet, who first identified them in the mid-nineteenth century.

Wolf-Rayet stars are hot stars, perhaps 20 times more massive than the sun, that are rapidly blowing away material and losing mass. [WC] stars are rather different: they are low-mass sun-like stars at the end of their lives. While these stars have recently ejected much of their original mass, the hot is still losing mass at a high rate, creating a hot wind. It is these winds that cause them to resemble Wolf-Rayet stars.However, astronomers can look more closely at the composition of these winds to tell the stars apart; [WC] stars are identified by the carbon and oxygen in their winds. Some true Wolf-Rayet stars are rich in nitrogen instead, but this is very rare among their low-mass counterparts.

HD 184738 is also very bright in the infrared part of the spectrum, and is surrounded by dust very similar to the material that the Earth formed from. The origin of this dust is uncertain.


Explore further

A sheep in wolf-rayet's clothing

Provided by NASA
Citation: Hubble eyes a smoldering star (2013, September 23) retrieved 14 November 2019 from https://phys.org/news/2013-09-hubble-eyes-smoldering-star.html
This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.
0 shares

Feedback to editors

User comments