Dwarf Spheroidal Makes Its Presence Known
So what was the early universe like? What were the
In the course of the observation, the telescope found another population of stars
Why Isn’t Bedin 1 a Cluster?
So, one question about Bedin 1 is whether it’s really just another cluster of stars like the nearby globular. As I looked at the image, I thought about the difference between a globular cluster and a dwarf spheroidal. It turns out that the delineation between them isn’t always clear. Both types of objects have stars that are very old, and very often metal-poor. That last bit is important because the very youngest stars in the universe were also metal-poor. Not until the first generations of stars were born, lived their lives, and died did the universe become enriched with elements heavier than hydrogen and helium.
That’s because as stars live, they produce elements heavier than hydrogen and helium in their cores. At their deaths, those elements: carbon, nitrogen, oxygen, and so on, are spread out to surrounding space. The most massive stars are also implicated in the creation of such elements as iron, gold, and so on. Neutron stars are also involved in the creation of heavy elements when they collide with each other.
I mentioned that globular cluster stars are also very old
What Does Bedin 1 Tell Us?
That brings me back to Bedin 1. It’s likely to be a dwarf spheroidal if it’s massive (meaning it has a large component of dark matter for its tiny size: only 3,000 light-years across. It’s also very dim. Of course, astronomers will continue to study and measure its mass.
So, what this means is: galaxies in the early universe were relatively metal-poor. And, dwarf spheroidals like Bedin 1 represent that early, “pristine” universe. The coolest thing about Bedin 1 is that it’s a remnant of that very early universe. Its stars hark back to a time when the universe was very young. And, it shows us what stars were like at that time.
Luckily, Bedin 1 hasn’t had a history of collisions with other galaxies. It has existed since early times as much as it is today. And, that gives astronomers a great look back in time to the infancy of the cosmos. It reveals what galaxies might have been like at a very young age. That was before the explosions of stars enriched them with elements that ultimately led to planets and life.
The post Dwarf Spheroidal Makes Its Presence Known appeared first on .
Source: http://thespacewriter.com/wp/2019/02/08/bedin-1-shows-us-the-early-universe/
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