Hubble Telescope Snaps Stunning Photo of Star Cluster in Neighboring Galaxy
NASA has released an image taken by the Hubble space telescope of a cluster of stars known as NGC-121, in one of our neighboring galaxies.
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“Geologist [I'm Climate Change]”
Since: Mar 07
#1 Jul 21, 2014
Nice: 10 billion years old is rather younger than our own globular clusters (which tend to hover around 13 to 12 bilion years or so) with a few young ones (around 10 billion) orbiting close to the bar. The clusters in our galaxy appear to be involved in "prompt initial enrichment" with the result that there is a spread of metallicities in clusters of relatively similar age (probably the result of globular cluster hosted merger supergiants & supernovae which tend to result in a dusty mess in surrounding infalling gas filled space).
The handy bit here is the colour magnitude diagram which should reveal the absolute magnitude of the stars in the giant & horizontal branch, & also the turnoff point.
These values (younger cluster) should be brighter than examples in our own galaxy with similar metallicity.
Would be nice to show absolute magnitude colour magnitude diagrams of NGC 121, and a cluster of similar metallicity in our own galaxy as a comparison.
Have a nice day: Ag
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