Featured Research

from universities, journals, and other organizations

Glimpsing the end of our solar system

Date:
June 20, 2011
Source:
University of Leicester
Summary:
Astronomers are investigating the possible eventual fate of the solar system by examining 'white dwarf' stars elsewhere in our galaxy.

A Hubble Space Telescope color image of a small portion of the cluster only 0.63 light-years across reveals eight white dwarf stars (inside blue circles) among the cluster's much brighter population of yellow sun-like stars and cooler red dwarf stars.
Credit: Harvey Richer (University of British Columbia, Vancouver, Canada) and NASA

Researchers at the University of Leicester are investigating the possible eventual fate of the solar system by examining 'white dwarf' stars elsewhere in our galaxy.

A white dwarf is the last stage in the life cycle of a star like the Sun, after it has contracted to a diameter smaller than that of Earth. Incredibly dense, one teaspoon of white dwarf material would weigh about five tonnes.

Nathan Dickinson, a postgraduate student in the University's Department of Physics and Astronomy, is researching the chemical composition of white dwarfs for his PhD. He is particularly interested in the presence of 'heavy elements' in and around white dwarfs, which are otherwise mainly composed of the two simplest elements, hydrogen and helium.

Data from the Hubble Space Telescope provides a spectrum for each star which reveals its chemical make-up. Older, cooler white dwarfs, with a temperature of less than 25,000 degrees, sometimes contain elements such as oxygen, nitrogen, silicon and iron which have been 'hoovered up' from the remains of planets.

Younger, hotter white dwarfs, above that temperature always show heavy chemicals due to their high temperature. However, they sometimes exhibit more of this material than is expected, which raises the question of whether this extra material also came from planets or whether it originated elsewhere, perhaps in clouds around the star."

"Understanding whether the extra material in hot white dwarfs comes from torn up planets is important," emphasizes Dickinson. "It can give us an idea of how these ancient planetary systems evolve as the star ages, so we get a fuller picture of how solar systems die.

"Being the end point of the life cycles of most stars, white dwarfs are among the oldest objects in the galaxy, so they can tell us about what were in the oldest solar systems. Given that the Sun will end its life as a white dwarf, this could tell us what could ultimately happen to our solar system."

In 2010 Dickinson presented some of his work at the 17th European White Dwarf Workshop in Germany, which has since been published in the journal AIP Conference Proceedings.

"Working at the forefront of this scientific area is extremely exciting," says Dickinson. "I find being one of a relatively small community of people in the world to work on this particular area amazing. This work is helping to shape our understanding of how most stars end their lives, how solar systems die, how the environment around these ancient stars behaves and what will ultimately happen to the vast majority of stars in the galaxy.

Pro Vice Chancellor and Head of the College of Science and Engineering, Professor Martin Barstow added: "These are important results which show how younger scientists can be involved in cutting edge research and help the University make important contributions to answering some of the most challenging questions about the Universe and our place within it."


Story Source:

The above story is based on materials provided by University of Leicester. Note: Materials may be edited for content and length.


Journal Reference:

  1. N. J. Dickinson, M. A. Barstow, I. Hubeny, Klaus Werner, T. Rauch. The Stratification of Metals in Hot White Dwarf Atmospheres. , DOI: 10.1063/1.3527850

Cite This Page:

University of Leicester. "Glimpsing the end of our solar system." ScienceDaily. ScienceDaily, 20 June 2011. <www.sciencedaily.com/releases/2011/06/110617080839.htm>.
University of Leicester. (2011, June 20). Glimpsing the end of our solar system. ScienceDaily. Retrieved July 24, 2014 from www.sciencedaily.com/releases/2011/06/110617080839.htm
University of Leicester. "Glimpsing the end of our solar system." ScienceDaily. www.sciencedaily.com/releases/2011/06/110617080839.htm (accessed July 24, 2014).

Share This




More Space & Time News

Thursday, July 24, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Raw: Cargo Craft Undocks from Space Station

Raw: Cargo Craft Undocks from Space Station

AP (July 22, 2014) A Russian Soyuz cargo-carrying spacecraft undocked from the International Space Station on Monday. The craft is due to undergo about ten days of engineering tests before it burns up in the Earth's atmosphere. (July 22) Video provided by AP
Powered by NewsLook.com
NASA Ceremony Honors Moon Walker Neil Armstrong

NASA Ceremony Honors Moon Walker Neil Armstrong

AP (July 21, 2014) NASA honored one of its most famous astronauts Monday by renaming a historic building at the Kennedy Space Center in Florida. It now bears the name of Neil Armstrong, the first man to walk on the moon. (July 21) Video provided by AP
Powered by NewsLook.com
Neil Armstrong's Post-Apollo 11 Life

Neil Armstrong's Post-Apollo 11 Life

Newsy (July 19, 2014) Neil Armstrong gained international fame after becoming the first man to walk on the moon in 1969. But what was his life like after the historic trip? Video provided by Newsy
Powered by NewsLook.com
This Week @ NASA, July 18, 2014

This Week @ NASA, July 18, 2014

NASA (July 18, 2014) Apollo 11 yesterday, Next Giant Leap tomorrow, Science instruments for Europa mission, and more... Video provided by NASA
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins