globular Definition and 27 Threads

I asked Bard that question and it responded (among other things) that a) globular clusters are spherical and b) that they are spinning rapidly. Aren't those two things contradictory, as in they should be flattened by centrifugal forces?

How far is M4? I have seen contradictory numbers for M4 and stars in it. How precise is Gaia in measuring the radial distances to various stars in M4? Their radial position relative to each other? Their peculiar motions? What kinds of orbits do stars in the outskirts of M4 follow? High...

I attached a file which shows my attempt to resolve this problem with the possible two pair interaction which gives us the kinetic energy of the cluster in an expanding system, at least I think so. But to be honest I´m more or less completely stuck with this question and I would be glad if...

I am searching for Globular Clusters in SDSS data. From what I have learned after sifting through documentation and the data structures, there is no identifier by which I could directly search for GCs. Nearby clusters are catalogued as individual stars with no apparent link to parent cluster...

On the podcast “Skeptics Guide to the Universe”, host, Steven Novella mentioned that astronomers can tell the difference between globular clusters orbiting the Milky Way Galaxy and satellite galaxies by looking to see if there is the gravitational effects of dark matter. Why would this be? That...

Regarding a recent article from phys.org , Chilean researchers have conducted a study of an old, metal-rich cluster, NGC 5927. Interesting results are the abundance of many metals, which include sodium, aluminium, iron, oxygen and some heavy metals such as yttrium and zirconium. Thank you.

My question is directly towards figure 2.15 from Galaxies in the Universe, An Introduction by Sparke and Gallagher. Everything in the figure makes sense to me until the authors make the point, "Clusters with a blue horizontal branch (filled dots) are more concentrated to the center than are...

Homework Statement Go to the following web site: http://www.astro.utoronto.ca/~cclement/cat/listngc.html This is the portal to a large on-line catalog of variable stars in globular clusters. Each link is a cluster name and will take you to a simple text page that lists near the top the...

So globular just means spherical, are globular proteins just red blood cells; then all red blood cells are considered globular proteins. Are all enzymes in the blood red blood cells? Are all red blood cells enzymes? What else in the blood is spherical? What is in the blood other than...

Virgo has moved on, Hercules is now in position- from last night: This is a downsized crop. Technical deets: 800/5.6, 10s ISO 2000, 204 frames.

Hi all. I'd like to use a software package, that has been designed for collisionless dynamics, to investigate general globular clusters. As they are highly collisional, at least in their inner parts, this perhaps makes no sense. However, it may be meaningful for some time- or length-scales or...

So I was interested in how astronomers measure the distances to other stars, galaxies, etc and I found this pdf about the subject http://articles.adsabs.harvard.edu/cgi-bin/nph-iarticle_query?1992PASP..104..599J&data_type=PDF_HIGH&whole_paper=YES&type=PRINTER&filetype=.pdf It seems to be a good...

Dr. Tom Maccarone is a coauthor of the paper, “Two stellar-mass black holes in the globular cluster M22”, and is Associate Professor,Department of Physics, at Texas Tech University at Lubbock Texas. The work is discussed in a popular form at "Physicists Find Black Holes In Globular Star...

Hello, As part of a course I have been asked to make a observing proposal which aims to detect globular clusters in the bulge of M31. The "virtual" observation will be conducted using the Hubble telescope and the WFC3 To begin with we aim to acquire a sample of globular clusters down to 10^6...

In preparing a post for the globular cluster thread, I found reference to "High Velocity Globular Cluster One, or HVGC-1. This is the first globular cluster discovered to have been ejected by the interaction of two massive black holes. http://hvgc-1/ A Globular Cluster Toward M87 with a Radial...

Hi, Could someone enlighten me in this matter? . how the calibration of cosmic distance scale affects the determination of the age of globular star clusters? thanks a lot :)

what's the center of a globular cluster , is it a star or can it be a black hole ? how are they formed and bound to gravitational pull of the milky way

: Estimate the mass of a globular cluster with the radius of R=20pc and root mean square velocity of stars equal to Vrms=3km/s i can apply the formula like Vrms=(root over) 3RT/M ( where R=gas constant, T= absolute temperature, M=mass of the cluster) but here the variable of the "T" is...

Homework Statement Two globular clusters A and B have cylindrical polar coordinates relative to the centre of the galaxy (r, z, Ø) given by A = (5,2,15°) and B= (4.6,65°), where the r and z coordinates are in kiloparsecs. Homework Equations Find a and b the position vectors of each...

Would it be possible to calculate the approximate distance between stars in a globular cluster by doing something simple like this: Approximate distance to a cluster: 25,000 Ly Two stars in the cluster just barely resolved in my telescope (resolution about 1 arcsec) Therefore: 2pi...

I suspect that the runtime simulation for a star systems containing thousands of stars , many of those stars whose mass is way beyond the solar mass to be very very long. Is it possible and cost-friendly(i.e, not expensive) to simulate a globular star system cluster over a supermassive black...

Hey guys, can somebody helps me to understand better about fibrous vs globular protein please "So what is the main difference between fibrous proteins and globular proteins? Aside from the difference in shape (elongated vs. spheroidal) and solubility (insoluble vs. soluble), fibrous proteins...

Quick question(s): If a cluster is not "open", it's what? M62 is a what cluster? (No, not peanuty nougat). What would be the average distance between stars in a cluster like this? What would be the average orbital period? And ultimately, what would the motion patterns of stars in...

I do not understand why Globular clusters, with ages around 10 Giga years, are so metal poor. Their stars are surely undergoing nucleosynthesis, right? Are all the stars in such cluster only of such low mass that they never explode as supernova and scatter their elements? TIA Sterling

As I understand it, the stars in a globular cluster have orbits with a whole range of eccentricities and directions of motion, giving the cluster an overall spherical shape, with a greater density of stars toward the center. How did the overall cloud out of which the globular cluster arose...

they are the oldest things in the galactic halo, having formed near the birth of the milky way. So with all the 10 odd billions of years of existence, i think they all should have gone supernova and destroyed the shape of the cluster. So how do they stay gloubular in their shape?

what does the gravitational field at the center of a globular cluster look like? it doesn't look as though there is any angular momentum - is there a 'center' of gravity inside? a black hole?