facebook
twitter
rss
account
search
search
 

Astronomers determine mass of brown dwarfs

June 5, 2008 at 4:17 PM   |   Comments

MANOA, Hawaii, June 5 (UPI) -- U.S. and Australian astronomers have, for the first time, calculated the mass of brown dwarfs -- "failed stars" with less than 7 percent of the sun's mass.

The astronomers -- Trent Dupuy and Michael Liu of the University of Hawaii and Michael Ireland of the University of Sydney -- used both the orbiting Hubble Space Telescope, and the Keck II Telescope in Hawaii.

."These are very challenging measurements, because brown dwarf binaries have tiny separations on the sky and orbit each other very slowly. We needed to obtain the sharpest measurements that are possible with current telescopes to precisely monitor their motion," said Trent Dupuy of the University of Hawaii.

The two brown dwarf binaries examined were 45 to 60 light years from Earth, with brown dwarfs in one of the systems each having just 3 percent of the sun's mass; the two in the other system each had a mass less than 6 percent of that of the sun.

The team is to report its study in a future issue of the Astrophysical Journal.

© 2008 United Press International, Inc. All Rights Reserved. Any reproduction, republication, redistribution and/or modification of any UPI content is expressly prohibited without UPI's prior written consent.
Recommended UPI Stories
Featured UPI Collection
trending
2014: The Year in Music [PHOTOS]

2014: The Year in Music [PHOTOS]

Most Popular
1
Proposed Texas textbooks teach climate change skepticism Proposed Texas textbooks teach climate change skepticism
2
Brazil to build giant observation tower above Amazon Brazil to build giant observation tower above Amazon
3
Humpback whale rescued off Maine coast Humpback whale rescued off Maine coast
4
The NSA will now map out the entire Internet The NSA will now map out the entire Internet
5
Dogs are the favorite food of leopards in rural India Dogs are the favorite food of leopards in rural India
Trending News
Video
x
Feedback