More Evidence of Massive First Generation Stars - by BrianKoberlein
Pair-production by a high energy gamma-ray. Credit: U Mallik, University of Iowa
The more massive the star, the more hot and dense the core. And when it collapses, the more intense the neutrinos and gamma rays. For truly massive stars a gamma ray photon is so intense that when it strikes a nuclei it can create an electron-positron pair. These charged particles interact incredibly strongly with surrounding nuclei, creating a pressure too powerful for gravity to hold. They also cause a different range of heavy elements to form, which is where this study comes in.
The team looked at a distant star known as J1010+2358, which is perhaps the earliest star we’ve ever observed. It is not a Population III star, but it is low in metals. From spectral observations of the star they found it had extremely low abundances of sodium and cobalt. Less than one percent of the abundance found in the Sun. The team found higher abundances of magnesium and nickel.
This is interesting, because of the atomic numbers of these elements. Sodium and Cobalt have an odd number of electrons, while magnesium and nickel have an even number. This split between even and odd abundances is exactly the kind of thing you would expect to see in the remnant of a pair-instability supernova. Based on the observations, the team estimates that J1010+2358 formed from the remnant of a 260 solar mass progenitor, which was likely a first-generation Population III star.
Indonesia Berita Terbaru, Indonesia Berita utama
Similar News:Anda juga dapat membaca berita serupa dengan ini yang kami kumpulkan dari sumber berita lain.
Save a massive $200 on the equally massive Anycubic Photon M3 Max 3D printerThis is a Father's Day sale, but anyone can grab the Anycubic Photon M3 Max 3D printer with a massive $200 discount, for a limited time.
Baca lebih lajut »
Micael's first MLS goal helps Dynamo top LAFC for first road winThe Dynamo shut out LAFC for the second straight match, this time in Los Angeles for...
Baca lebih lajut »
Jupiter-sized planets are very rare around the least massive starsA six-year search of 200 nearby low-mass red dwarf stars found no Jupiter-like planets, boosting the standard theory for how such planets form.
Baca lebih lajut »
Chemical traces offer evidence of the universe's earliest starsFirst-generation stars had short lives that ended in partial explosions and can be detected only through the chemical signatures they left in the stars that succeeded them.
Baca lebih lajut »
Massive Marvel shakeup: Avengers 5 and 6, Thunderbolts, Blade, and more delayedDisney just shook up its entire movie release schedule, and many Marvel movies were delayed as a result, including Avengers 5 and 6.
Baca lebih lajut »
Disney’s Massive Release Date Changes Explained: What’s Moved & WhyDisney has just announced a ton of release dates for some of its biggest movies, so here's why the delays are happening and every film affected.
Baca lebih lajut »