earthsize diamond in space white dwarf
Last Updated : GMT 05:17:37
Emiratesvoice, emirates voice
Emiratesvoice, emirates voice
Last Updated : GMT 05:17:37
Emiratesvoice, emirates voice

Earth-size 'diamond' in space: White Dwarf

Emiratesvoice, emirates voice

Emiratesvoice, emirates voice Earth-size 'diamond' in space: White Dwarf

White Dwarf
Tehran - FNA

Astronomers identified possibly the coldest, faintest white dwarf star ever detected. This ancient stellar remnant is so cool that its carbon has crystallized, forming -- in effect -- an Earth-size diamond in space. The object in this new study is likely the same age as the Milky Way, approximately 11 billion years old.
A team of astronomers has identified possibly the coldest, faintest white dwarf star ever detected. This ancient stellar remnant is so cool that its carbon has crystallized, forming -- in effect -- an Earth-size diamond in space.
"It's a really remarkable object," said David Kaplan, a professor at the University of Wisconsin-Milwaukee. "These things should be out there, but because they are so dim they are very hard to find."
Kaplan and his colleagues found this stellar gem using the National Radio Astronomy Observatory's (NRAO) Green Bank Telescope (GBT) and Very Long Baseline Array (VLBA), as well as other observatories.
White dwarfs are the extremely dense end-states of stars like our Sun that have collapsed to form an object approximately the size of Earth. Composed mostly of carbon and oxygen, white dwarfs slowly cool and fade over billions of years. The object in this new study is likely the same age as the Milky Way, approximately 11 billion years old.
Pulsars are rapidly spinning neutron stars, the superdense remains of massive stars that have exploded as supernovas. As neutron stars spin, lighthouse-like beams of radio waves, streaming from the poles of its powerful magnetic field, sweep through space. When one of these beams sweeps across Earth, radio telescopes can capture the pulse of radio waves.
The pulsar companion to this white dwarf, dubbed PSR J2222-0137, was the first object in this system to be detected. It was found using the GBT by Jason Boyles, then a graduate student at West Virginia University in Morgantown.
These first observations revealed that the pulsar was spinning more than 30 times each second and was gravitationally bound to a companion star, which was initially identified as either another neutron star or, more likely, an uncommonly cool white dwarf. The two were calculated to orbit each other once every 2.45 days.
The pulsar was then observed over a two-year period with the VLBA by Adam Deller, an astronomer at the Netherlands Institute for Radio Astronomy (ASTRON). These observations pinpointed its location and distance from Earth -- approximately 900 light-years away in the direction of the constellation Aquarius. This information was critical in refining the model used to time the arrival of the pulses at Earth with the GBT.
By applying Einstein's theory of relativity, the researchers studied how the gravity of the companion warped space, causing delays in the radio signal as the pulsar passed behind it. These delayed travel times helped the researchers determine the orientation of their orbit and the individual masses of the two stars. The pulsar has a mass 1.2 times that of the Sun and the companion a mass 1.05 times that of the Sun.
These data strongly indicated that the pulsar companion could not have been a second neutron star; the orbits were too orderly for a second supernova to have taken place.
Knowing its location with such high precision and how bright a white dwarf should appear at that distance, the astronomers believed they should have been able to observe it in optical and infrared light.
Remarkably, neither the Southern Astrophysical Research (SOAR) telescope in Chile nor the 10-meter Keck telescope in Hawaii was able to detect it.
"Our final image should show us a companion 100 times fainter than any other white dwarf orbiting a neutron star and about 10 times fainter than any known white dwarf, but we don't see a thing," said Bart Dunlap, a graduate student at the University of North Carolina at Chapel Hill and one of the team members. "If there's a white dwarf there, and there almost certainly is, it must be extremely cold."
The researchers calculated that the white dwarf would be no more than a comparatively cool 3,000 degrees Kelvin (2,700 degrees Celsius). Our Sun at its center is about 5,000 times hotter.
Astronomers believe that such a cool, collapsed star would be largely crystallized carbon, not unlike a diamond. Other such stars have been identified and they are theoretically not that rare, but with a low intrinsic brightness, they can be deucedly difficult to detect. Its fortuitous location in a binary system with a neutron star enabled the team to identify this one.

 

Name *

E-mail *

Comment Title*

Comment *

: Characters Left

Mandatory *

Terms of use

Publishing Terms: Not to offend the author, or to persons or sanctities or attacking religions or divine self. And stay away from sectarian and racial incitement and insults.

I agree with the Terms of Use

Security Code*

earthsize diamond in space white dwarf earthsize diamond in space white dwarf

 



Name *

E-mail *

Comment Title*

Comment *

: Characters Left

Mandatory *

Terms of use

Publishing Terms: Not to offend the author, or to persons or sanctities or attacking religions or divine self. And stay away from sectarian and racial incitement and insults.

I agree with the Terms of Use

Security Code*

earthsize diamond in space white dwarf earthsize diamond in space white dwarf

 



GMT 05:14 2024 Wednesday ,07 February

Sophisticated Classic Dining Room Design Ideas

GMT 10:51 2016 Tuesday ,22 November

Klinsmann fired as US coach

GMT 05:17 2017 Wednesday ,05 July

Now, have breakfast, coffee with rats

GMT 12:10 2018 Thursday ,18 January

Lebanon reverses ban on Spielberg's 'The Post'

GMT 11:35 2017 Thursday ,28 September

Young Emiratis Credit Young ADIPEC with Helping Them

GMT 11:56 2017 Wednesday ,13 December

Brexit deal shows UK can leave EU

GMT 08:45 2017 Saturday ,30 September

Yasmine Sabri reveals secrets of her happiness

GMT 20:22 2016 Sunday ,17 July

Jagger to be dad again at 72

GMT 21:30 2016 Wednesday ,11 May

Nilesat attains profits worth $ 91.5m in 2015

GMT 00:48 2017 Sunday ,12 March

Iran condemns Syria terrorist bomb attacks

GMT 12:04 2012 Tuesday ,17 July

US drones make peace with Pakistan less likely

GMT 00:48 2012 Friday ,10 August

Judge Judy is highest paid TV star
 
 Emirates Voice Facebook,emirates voice facebook  Emirates Voice Twitter,emirates voice twitter Emirates Voice Rss,emirates voice rss  Emirates Voice Youtube,emirates voice youtube  Emirates Voice Youtube,emirates voice youtube

Maintained and developed by Arabs Today Group SAL.
All rights reserved to Arab Today Media Group 2021 ©

Maintained and developed by Arabs Today Group SAL.
All rights reserved to Arab Today Media Group 2021 ©

emiratesvoieen emiratesvoiceen emiratesvoiceen emiratesvoiceen
emiratesvoice emiratesvoice emiratesvoice
emiratesvoice
بناية النخيل - رأس النبع _ خلف السفارة الفرنسية _بيروت - لبنان
emiratesvoice, Emiratesvoice, Emiratesvoice