by León » Tue Aug 17, 2010 12:57 pm
Transcribe
1. the stars in a cluster are all at about the same distance
2. the stars have approximately the same age
3. the stars have about the same chemical composition
4. the stars have different masses, ranging from about 80-100 solar masses for the most massive stars in very young clusters to less than about 0.08 solar masses.
http://www.seds.org/messier/open.html
This cluster is one of the youngest known, with an estimated age of only 7.1 million years (Sky Catalog 2000). Its hottest star is of spectral type B0. According to Burnham, the 3 brightest stars are blue giants of mag 5.75 and spectral type B9, mag 5.94 and type B3, and mag 6.80/B2, while the fourth brightest star is a mag 7.58 M2 red supergiant. Another mag 5.7/spectral type A1 star is probably also a member, another white supergiant: This star would be the brioghtest of the cluster at about absolute magnitude -7.7 (83,000 solar luminosities).
As I am of the view that planets are remnants of stars, I would emphasize in Section 4. For now, comes up as, the studies are made from the most notable stars that are larger, but in the neighborhood and especially within the solar system to focus the studies require small stars.
Regarding the cluster, it is conceivable that the central star and old giant orange, like Betelgeuse, it could be the mother of the cluster to be ionized nebula of the raw material
supplier.
Down the globular cluster NGC 1818 ought to be called jewelry by color
Transcribe
1. the stars in a cluster are all at about the same distance
2. the stars have approximately the same age
3. the stars have about the same chemical composition
4. the stars have different masses, ranging from about 80-100 solar masses for the most massive stars in very young clusters to less than about 0.08 solar masses. http://www.seds.org/messier/open.html
This cluster is one of the youngest known, with an estimated age of only 7.1 million years (Sky Catalog 2000). Its hottest star is of spectral type B0. According to Burnham, the 3 brightest stars are blue giants of mag 5.75 and spectral type B9, mag 5.94 and type B3, and mag 6.80/B2, while the fourth brightest star is a mag 7.58 M2 red supergiant. Another mag 5.7/spectral type A1 star is probably also a member, another white supergiant: This star would be the brioghtest of the cluster at about absolute magnitude -7.7 (83,000 solar luminosities).
As I am of the view that planets are remnants of stars, I would emphasize in Section 4. For now, comes up as, the studies are made from the most notable stars that are larger, but in the neighborhood and especially within the solar system to focus the studies require small stars.
Regarding the cluster, it is conceivable that the central star and old giant orange, like Betelgeuse, it could be the mother of the cluster to be ionized nebula of the raw material
supplier.
Down the globular cluster NGC 1818 ought to be called jewelry by color
[img]http://4.bp.blogspot.com/_IFLtLt_K5Ds/TGqO-iutb1I/AAAAAAAADh8/R5q-dfyx3rs/s400/cumuloglobular+ngc1818_hst.jpg[/img]