"Yet another ball ?,  you decide - NGC 6229", carl0s

"Yet another ball ?, you decide - NGC 6229"

Equipment

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Acquisition details

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Description

NGC 6229 is a GC in Hercules. Because of a much closer M13 and M92 it isn't a popular target.

The GC was discovered by Herschel. Because of it's roundness Herschel classified it as a planetary nebula. Other observers have mistaken it for a comet.

Finally in 1856, Louis d'Arrest recognized it as a "very crowded cluster"

NGC 6229 is comparable to M5 in metallicity and age (~13Gy)

It contains a population of blue stragglers. Sanna et. al found 64 of them.

Astronomers have several explanations how blue stragglers stars (BSS) are forming.

My favorite BSS theory is a collision of two stars in a dense environmet of a GC.

This ball of stars "floats" in the outer halo of the Milky Way. 100.000 light years away from us...

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This time I tried another setup for the image aquisition. I wanted to experiment a little bit.

The original FL of the SCT was extended to 4m with an 2x Barlow.

The CCD was set to a 4x4 binning. It results in a pixel resolution of 0.821 arcsec/pix. The FOV is something like 6.7' x 5.6'

The exposure time was set to 5 sec. I'm considering this setup as a kind of "lucky imaging".

In total, I acquired 2500 frames. With PI's SubFrameSelector , this number was reduced to 170 frames.

The annotated version shows the original, unprocessed image.

Comments

Revisions

  • "Yet another ball ?,  you decide - NGC 6229", carl0s
    Original
  • "Yet another ball ?,  you decide - NGC 6229", carl0s
    B
  • Final
    "Yet another ball ?,  you decide - NGC 6229", carl0s
    C

Histogram

"Yet another ball ?,  you decide - NGC 6229", carl0s

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