Author Topic: Space news topic and space related news  (Read 64172 times)

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Offline Toliman

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Re: Space news topic and space related news
« Reply #1980 on: January 19, 2020, 05:09:28 pm »

Offline Toliman

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Re: Space news topic and space related news
« Reply #1981 on: January 30, 2020, 03:46:11 pm »

Offline Toliman

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Re: Space news topic and space related news
« Reply #1982 on: February 04, 2020, 06:10:23 pm »
ARCHIVAL DATA REVEALS EARLIEST STAGES OF A DRAMATIC EVENT
https://hubblesite.org/contents/news-releases/2020/news-2020-07

Astronomers searching archival data from NASA's Kepler exoplanet hunting mission identified a previously unknown dwarf nova that underwent a super-outburst, brightening by a factor of 1,600 times in less than a day. While the outburst itself has a theoretical explanation, the slow rise in brightness that preceded it remains a mystery. Kepler's rapid cadence of observations were crucial for recording the entire event in detail.
The dwarf nova system consists of a white dwarf star with a brown dwarf companion. The white dwarf is stripping material from the brown dwarf, sucking its essence away like a vampire. The stripped material forms an accretion disk around the white dwarf, which is the source of the super-outburst. Such systems are rare and may go for years or decades between outbursts, making it a challenge to catch one in the act.

Offline Toliman

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Re: Space news topic and space related news
« Reply #1983 on: February 11, 2020, 02:16:42 pm »
ALMA catches beautiful outcome of stellar fight
https://www.almaobservatory.org/en/audiences/alma-catches-beautiful-outcome-of-stellar-fight/

Astronomers using the Atacama Large Millimeter/submillimeter Array (ALMA), in which ESO is a partner, have spotted a peculiar gas cloud that resulted from a confrontation between two stars. One star grew so large it engulfed the other which, in turn, spiralled towards its partner provoking it into shedding its outer layers.

Like humans, stars change with age and ultimately die. For the Sun and stars like it, this change will take it through a phase where, having burned all the hydrogen in its core, it swells up into a large and bright red-giant star. Eventually, the dying Sun will lose its outer layers, leaving behind its core: a hot and dense star called a white dwarf.

“The star system HD101584 is special in the sense that this ‘death process’ was terminated prematurely and dramatically as a nearby low-mass companion star was engulfed by the giant,” said Hans Olofsson of the Chalmers University of Technology, Sweden, who led a recent study, published in Astronomy & Astrophysics, of this intriguing object.




 

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