Thank you very much AnnAnn wrote:Wolfgang, I can see that you are online now, so let me say that that is an interesting image of NGC 1491. I'm not too sure of what kind of nebula that is, but I note its interesting colors. The interior of it is magenta as if the color is a mixture of blue reflection nebulosity - testifying to the presence of dust relatively close to the hot star - and ionized red hydrogen, testifying to the presence of a hot star, probably at least of class B2. The nebula is surrounded by a red rim, which may possibly be more highly ionized and brighter than the interior of the nebula because it "collides" with the interstellar medium.
That's an interesting image! Thanks!
Ann wrote:Leonardo Orazi, I want to thank you, belatedly, for your very fine picture of NGC 205, on of the satellite galaxies of the Andromeda Galaxy. NOte the tidal tail of stars stretching away to the upper right in theis picture, probably in the direction of mighty Andromeda!
But note, too, the interesting characteristics of NGC 205. Far from being a featureless boring yellow blob, NGC 205 sports dust clouds close to its central region. And inside the dust, closer to the center, the stellar population is bluer than elsewhere! We are clearly talking A- and F-stars here, whereas the rest of the galaxy is dominated by K- and M-type stars. Obviously NGC 205 underwent a smallish burst of central star formation a few hundred million years ago. Thanks for making that clear in your very fine image, Leonardo!
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