";s:4:"text";s:5232:" If a star is in a We learn about the stars by receiving and interpreting the messages which their light brings to us. This piece of apparently routine work proved very fruitful — it led to the discovery that all the stars of very faint absolute magnitude were of spectral class M. In conversation on this subject (as I recall it), I asked Pickering about certain other faint stars, not on my list, mentioning in particular 40 Eridani B. Characteristically, he sent a note to the Observatory office and before long the answer came (I think from Mrs. Fleming) that the spectrum of this star was A. I knew enough about it, even in these paleozoic days, to realize at once that there was an extreme inconsistency between what we would then have called "possible" values of the surface brightness and density. “But what’s special is this UV flash. The rare flash lasted for a couple of days which indicated that something inside or nearby the white dwarf was incredibly hot.
Lastly, it's possible two white dwarfs merged, with SN2019yvq's UV flash representing an explosion as ejected material from both stars came into contact.
Miller is particularly interested in exploring four different hypotheses, which match his team’s data analysis from SN2019yvq.Potential scenarios that could cause a white dwarf to explode with a UV flash are:“Within a year,” Miller said, “we’ll be able to figure out which one of these four is the most likely explanation.”Once the researchers know what caused the explosion, they will apply those findings to learn more about planet formation and dark energy. A. Miller (Northwestern University) and D. Goldstein (Caltech)The white dwarf star Stein 2051 B occupies the center of this Hubble image, and is located 17 light-years away. A team of researchers has spotted a rare type of supernova. Such a star will not become a white dwarf, because the mass of its central, non-fusing core, initially supported by A white dwarf is stable once formed and will continue to cool almost indefinitely, eventually to become a A white dwarf can also be cannibalized or evaporated by a companion star, causing the white dwarf to lose so much mass that it becomes a It has been proposed that white dwarfs with surface temperatures of less than 10,000 Kelvins could harbor a The mass of an isolated, nonrotating white dwarf cannot exceed the Accretion provides the currently favored mechanism called the Observations have failed to note signs of accretion leading up to Type Ia supernovae, and this is now thought to be because the star is first loaded up to above the Chandrasekhar limit while also being spun up to a very high rate by the same process. “I was modeling behavior for what would happen if we had a double detonation triggered by a thick helium shell on supercomputers at NERSC. Since this analysis uses the non-relativistic formula To interpret this result, observe that as we add mass to a white dwarf, its radius will decrease, so, by the uncertainty principle, the momentum, and hence the velocity, of its electrons will increase.
Because white dwarfs become cooler and cooler as they age, the influx of heat puzzled astronomers.“The simplest way to create UV light is to have something that’s very, very hot,” Miller said. Further, the event could also provide valuable information on planet formation and dark energy.The observations were made using the Zwicky Transient Facility in California and NASA's Neil Gehrels Swift Observatory. Iron from exploded stars, for example, formed the core of all rocky planets, including Earth.“If you want to understand how the Earth formed, you need to understand where iron came from and how much iron was needed,” Miller said. This event is poised to offer insights into several long-standing mysteries, including what causes white dwarfs to explode and how dark energy is accelerating the universe’s expansion. They immediately classified SN2019yvq as a type Ia (pronounced “one-A”) supernova, a fairly frequent event that occurs when a white dwarf explodes.“These are some of the most common explosions in the universe,” Miller said.