Timeline for Why do stars born in a cluster finally disperse?
Current License: CC BY-SA 3.0
9 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Oct 19, 2017 at 20:14 | comment | added | Alchimista | But I have to agree with a commenter that "sucks", although quoted, might mislead other readers. | |
| Oct 19, 2017 at 20:12 | comment | added | Alchimista | Thanks also for your answer. Surprisingly a very large cluster does not puzzled me, naively I see them as little galaxy within their real mother one. It is perhaps popular science that drove me thinking, as they normally mention Pleiads as 7 stars or so. Is matter of scale and surrounding. Other than that, the main principles are quite clear to me (and so more after reading the two answers). | |
| Sep 16, 2017 at 19:44 | comment | added | user18491 | In here I don't want to quote from the suggested arxiv.org/abs/1702.02149; I'm just gonna say this: Folks you should, please, read carefully. One more simple explanation: A massive black hole won't repel or expel close-by stars. Slightly further (small) stars are often get accelerated and get expelled by the presence of large masses and thus leave the cluster. Larger stars usually remain in the cluster. I repeat that globular clusters are more stable and have larger lifespans. The kinematics is complicated but there's no need to turn everything upside down. | |
| Sep 16, 2017 at 18:48 | comment | added | ProfRob | ok, so I look at Kizilstan et al (2017). Figs 1 and 2 show that the presence of a 2000 solar mass BH in 47 Tuc would reduce the density of the cluster core and accelerate the surrounding stars to higher speeds. arxiv.org/abs/1702.02149 | |
| Sep 16, 2017 at 18:34 | comment | added | user18491 | If you don't understand I advise reading a bit about IMBHs. | |
| Sep 16, 2017 at 18:27 | comment | added | ProfRob | Not only is your "phrasing" wrong, but the science is also incorrect. It is the presence of massive, compact binaries, possibly containing black holes, that accelerates stars to escape velocities even in globular clusters. | |
| Sep 16, 2017 at 18:16 | comment | added | user18491 | I you don't like my phrasing you can go ahead and vote down. The points I made are crystal clear. | |
| Sep 16, 2017 at 8:14 | comment | added | ProfRob | Please remove the sentence about black holes sucking. They exert no more gravitational influence than any other mass. | |
| Sep 16, 2017 at 2:41 | history | answered | user18491 | CC BY-SA 3.0 |