star system that may explode
Last Updated : GMT 05:17:37
Emiratesvoice, emirates voice
Emiratesvoice, emirates voice
Last Updated : GMT 05:17:37
Emiratesvoice, emirates voice

Supernova progenitor found?

Star system that may explode

Emiratesvoice, emirates voice

Emiratesvoice, emirates voice Star system that may explode

Star system that may explode
London - Arabstoday

Star system that may explode London - Arabstoday Type Ia supernovae are violent stellar explosions. Observations of their brightness are used to determine distances in the universe and have shown scientists that the cosmos is expanding at an accelerating rate. But there is still too little known about the specifics of the processes by which these supernovae form. New research, led by Stella Kafka of the Carnegie Institution for Science in the United States, identifies a star system, prior to explosion, which will possibly become a type Ia supernova. The work will appear in the journal Monthly Notices of the Royal Astronomical Society. The widely accepted theory is that type Ia supernovae are thermonuclear explosions of a white dwarf star that\'s part of a binary system -- two stars that are physically close and orbit around a common centre of mass. The white dwarf has mass gradually donated to it by its companion. When the white dwarf mass eventually reaches 1.4 times that of the sun, it explodes to produce a type Ia supernova. The crucial questions are: What is the nature of the donor star and how does this white dwarf increase its mass. Also, how would that process affect the properties of the explosion? With these questions in mind, scientists have been searching for candidate systems that could become type Ia supernovae. There are thousands of possibilities in the candidate pool, none of which have yet been observed to produce an explosion. Recent studies, some of which involved scientists at Carnegie observatories, have identified sodium gas associated with type Ia supernovae. This gas might be ejected from the binary\'s donor star and linger around the system to be detected after the white dwarf explodes. This provides a clue to the progenitor. Even so, Kafka still compared the search to \"looking for a needle in a stellar haystack.\" Using data from the DuPont telescope of the Las Campanas observatory in Chile, Kafka and her team -- Kent Honeycutt of Indiana University and Bob Williams of the Space Telescope Science Institute -- looked at these gas signatures and were able to identify a binary star called QU Carinae as a possible supernova progenitor. It contains a white dwarf, which is accumulating mass from a giant star, and sodium has been detected around the system. This star belongs to a small category of binaries that are very bright and in which the white dwarf accretes material from its companion at very high rates. Sodium should be produced in the atmosphere of the mass-donor giant star, and it can be ejected from the system via a stellar wind. If the white dwarf of this binary explodes into a supernova, the sodium would be detected with the same sort of signature as those found in other type Ia supernovae. \"We are really excited to have identified such a system,\" Kafka said. \"Understanding these systems, the nature of the two stars, the manner in which mass is exchanged, and their long-term evolution will give us a comprehensive picture on how binaries can create one of the most important explosions in the universe.\" From sciencedaily

GMT 10:08 2018 Wednesday ,24 January

Microsoft to open 4 data centres

GMT 06:12 2018 Tuesday ,23 January

Instagram, Google+ join EU group

GMT 05:06 2018 Monday ,22 January

Rocket Lab successfully sends rocket

GMT 09:03 2018 Sunday ,21 January

Europe's space agency braces

GMT 06:19 2018 Sunday ,21 January

A fake news article reports

GMT 04:17 2018 Saturday ,20 January

Google, Tencent eye collaboration

GMT 06:00 2018 Friday ,19 January

Australia lifesaving drone makes first rescue

GMT 07:36 2018 Thursday ,18 January

French glitches put technology under review
Emiratesvoice, emirates voice
Emiratesvoice, emirates voice

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*

star system that may explode star system that may explode

 



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*

star system that may explode star system that may explode

 



GMT 09:54 2018 Wednesday ,24 January

'Friendly and kind' N. Korean skaters

GMT 09:36 2017 Thursday ,07 December

Heidy Karam’s contract to present talk show close

GMT 10:50 2012 Friday ,20 January

Dusty weather expected in UAE on Friday

GMT 09:35 2018 Saturday ,13 January

New Zealand bat first in third ODI against Pakistan

GMT 10:48 2017 Saturday ,23 December

Meryl Streep's brand under threat

GMT 06:53 2017 Thursday ,11 May

17th Doha Forum To Begin Sunday

GMT 10:30 2017 Thursday ,23 November

Reports underline proliferation of weapons in Arab world

GMT 07:46 2017 Monday ,30 October

Catch it early, treat it early and move on

GMT 08:05 2015 Tuesday ,17 February

Conan O'Brien is first late night host to film in Cuba

GMT 16:17 2018 Thursday ,30 August

Five Saudi women pilots granted GACA licences
 
 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