Recent content by Helio

And you’re surprised? This is the place where the map says, “Here there be dragons.” I doubt the Webb is capable of dispelling more than a few of those rascals. The GMT (Giant Magellan Telescope), and other dragon slayers coming our way, might do wonders here. Well stated. The...

Perhaps relative to the poor efficiency of H2 cooling, the efficiency differences of the others aren't that important. Just a guess. Stellar physics, what little I've read, makes it clear that "metals" are necessary to dump heat in order to allow collapse, except when in the case of heavy...

There may be some confusion in the expectation that there a Pop III red dwarfs. Here is a paper that models behavior of low mass stars that emerge out of the accretion disks of the Pop III massive stars. The disk, they say, will contain some metals and dust, allowing for the necessary...

Right, there are a lot of dynamics at work. Perhaps their closer proximity for an early universe and their much greater mass than normal stars were enough to form the first protogalaxies. The JWST may indeed provide some answers. Perhaps, especially in the early universe with much greater...

It makes for better headlines when there are hints BBT is wrong due to a new JWST discovery. But if you look deeper you'll find that it may not be mainstream. There has always been a lot of wiggle room on what happened between the CMBR and the beginning of star formation leading to...

I assume you discount the BBT claim of only H and He in the early period. This prediction was found in the 1940s (Gamow and Alpher) and has never been refuted in any objective manner. The Type II Sn, as you mention, was not a surprise for a blue giant. Besides being visible to the naked eye...

In the early universe, I'm unsure if black hole mergers contribute much, even if they merge with neutron stars. Are there models that predict neturon "stars" would result from Pop III explosions? Perhaps. There may be too little to go on until more is learned about Pop III stars. Yes, but it...

Only Pop III stars would produce the elements for normal stars. BHs only contribute concentrated mass, AFAIK, assuming they were around during this early time.

According to BBT, the universe was necessarily H and He only, discounting tiny amounts of Li and perhaps Be. It took lots of work to figure out how any star could form from only H & He. The models finally found that if the stars were massive enough, then they could become the first stars...

C, N, O and other elements are produced by massive supernovae. Pop III stars were very likely extremely massive and had very, very short life spans. The lack of these elements in spectra would be odd, IMO.

The primary argument for building the JWST was to get us to a farther horizon and closer to the first stars. The news of such an early galaxy is exciting but not unexpected for some, perhaps many. https://arxiv.org/abs/2303.12500

And comparing the ratio to yellow stars isn’t ideal. 😜

Ug. It's hard to read such gobbledygook. They state things like, " If red dwarf systems were significantly better at hosting life—say, more than 8.1 times as habitable as yellow star systems—then our existence around a yellow star would be a statistical fluke, occurring less than 5% of the...

Their "Temperate" term seems to be broad but not fully. They show five of the Trappist exos, but they ignore Trappist-1 d, which has a sol. equivalent of 0.93 AU. I show Trappist-1 d in the warm to hot HZ area; Trappist-1 e as being in the normal HZ area; Trappist-1 f at sol. eq. of 1.62 in...

Ah. That solves it nicely, and colorfully. :) Thanks.