Stars Definition and 878 Threads

Homework Statement Two stars have apparent magnitudes of V = 5.1 and V = 4.6 but are too close together to be resolved with the naked eye and appear to be a single object. What is its apparent magnitude? Homework Equations I don't know what the relevant equations are if there are any...

I was showering and I realized I have no clue... all you read about is HOW they form, but I've never read whether they are still forming or not...

I posted it under celestia development forums but I wonder if, per chance, it is my misconception, so I ask it here. Is that true that absolute magnitude should be proportional to star temperature; that is, are hotter stars always brighter? edit: okay, I looked things up, changed my plot a...

Here's an article on a speech by Stephen Hawking: http://www.brooksbulletin.com/news/world_news.asp?itemid=59084 So even a physicist like Hawking -- who's not going to niavely believe in arbitrary comicbook fantasies about warp drive, hyperspace, etc -- is advocating that we go to the...

How likely is it that when stars are orbiting the centre of a galaxy that two stars will meet and be locked together and orbit each other or collide?

I just wanted to ask, if we are able to slow light particles by freezing the protons then would it be possible that stars are actually a lot closer to the Earth than we think since outer space is a cold vacuum, then light traveling from the stars would be slow, but every time this light travels...

Neutron stars represent the final stage of life for some massive stars. Typically, they have radii of 10 km. Determine the magnitude of the centripetal acceleration for a piece of neutron star matter on the star surface at the equator (so the matter moves in a circle of radius 10km). Assume...

I was intrigued by this paper, and apparent implications for Smolin's cosmic natural selection [CNS] conjecture. http://arxiv.org/abs/astro-ph/0609644 Observational constraints on quarks in neutron stars Authors: Pan Nana, Zheng Xiaoping Comments: 16 pages,6 figures We estimate the...

Hey, would anyone be able to tell me quality websites/ or help to answer the following questions: 1. What is a star? 2. How Astronomers can tell the difference between different stellar objects? 3. What powers a star? 4. The evelotionary path of a star and it's different stages. 5. Why...

how come stars burn at space if there is no oxygen in space?:confused:

I have been wondering something. Assuming strange quark stars exist (and I know that this is still too early to call), is it possible that a black hole might just be an overgrown quark star that has gone over the required mass (say from feeding on a nearby star or a collision)? Is there any...

Someone told me stars are formed by black hole, yet, I didn't believe him, are they really?

Hello, I wanted to know if the translational motion of the stars & planets are according to a polynomial sequence or not?? if not then how can the scientists predict the position of a specific star/planet after a specific period of time?? Thankyou for your answer...

Are the any? i would think that of all the stars in the u that a few some how broke free from gravity and the expansion of space time has separated them from their birth galaxy.

We were having a little chat in my physics lesson about neutron stars for our A level course, and nobody really understood why neutron stars have a magnetic field if they are consist of neutrons, which are obviously neutral charge. We thought that you needed charged particles to create a...

I have really no clue on how to this:cry: please help!

It's election time in my state and there's a lot of funny stuff going on. After observing the political parties campaigning, I've come up with the two main tactics used to win an election. (Before that, here's a bit of background on the two major political parties. The two prominent political...

If the stars in the Pleiades open cluster are about 100*10^6 years old, how do I find the mass of the stars that evolved away from the main sequence to form red giants? Any suggestions or comments are welcome! Thanks!

excellent websitehttp://www.solstation.com/x-objects/first.htm According to the site, WMAP's results show that the first stars (Population III) appeared about 400 million LightYears after the BB, instead of the 200 million LightYears previously thought. I have a question about this...

Q: Suppose that a binary star system consists of two stars of equal mass. They are observed to be separated by 340 million kilometers and take 5.0 Earth years to orbit about a point midway between them. What is the mass of each? I figured out that: mass=4pi^2(radius)^2/Gravitational...

Can anybody help me whit this? "Two stars which have the same mass are orbiting an object between the two stars. The velocity of the stars is 80 km/s and the time used on one orbit is 864000 s. Find the mass of the two stars." This is what I have done so far: r(radius)=1.1e10 m...

Hello Im doing a project for data management and i thought i could do a project on when stars where discovered when, where kinda thing. I've looked all around and i can't find quiet what I am looking for so i thought if i asked here some one would have a little somthing to help me out.

two exiled stars are leaving our galaxy forever They are surely traveling fast!

i don't get it. really large stars are unstable and there are frequent outbursts. so they are called variable stars. but when they burst they create a nebula and remain as a star right? how is that? shouldn't they turn into a black hole or a nutron star or just a nebula? or do they just vary...

For an assignment, we were told to use a program titled "Photoelectric Photometry of the Pleiades", located at this website. It is basically a simulation of a telescope, in which we can "measure" the apparent magnitude of the stars in the Pleiades cluster. My question is as follows: Show...

Probing the Shape of the Galactic Halo with Hyper-Velocity Stars Do they need a SMBH to sling shot them or would smaller masses do? Garth

I'm a relative newcomer to astronomy and am still trying to understand the lifecycles of stars, i think i understand that the beginning stages of stellar evolution involve hydrogen atoms being pulled towards a central area of gravity, but where does the gravity come from?

I was reading about neutron stars and wonder if anyone can help me with something that puzzled me , namely what happens to the electrons in such a mass of atomic neuclii? I can only see there might be 2 possibilities .Either 1) that the electrons are expelled from the atoms during the collapse...

A telescope has an objective mirror of 6m. An astronomer uses it to determine if a certain object is a binary star, i.e. two stars in orbit around a common point. If the object is 25 light years away (a light year is the distance light travels in one year) what is the minimum separation of...

Hello, all. This isn't entirely a real-life question, but I'd like to know your opinion. I'm a science fiction writer/astronomy lover trying for a "hard sci-fi" approach to the astronomy in my tale -- using as much real science as I can. So, I have a dilemma. Stars naturally die after fusing...

Is a neutron star held together mainly by the strong force? Are they dense enough so that this is the case, or is gravity the only thing to consider? What about black holes?

http://www.billingsgazette.com/index.php?display=rednews/2005/11/03/build/nation/96-nasa.inc

I do know that stars explode on occasion... but I don't understand how gravity could possibly have enough force (attraction or whatever you want to call it) to hold trillions and trillions and trillions of tons of hydrogen undergoing nuclear fusion. It seems to me that there would be vastly more...

Are there any tables for the distance against red shift of stars. I've heard that for stars close enough so you can measure the distance by triangulation it is correlated but not as strongly as the "almost perfect correlation" that I have been taught.

http://arxiv.org/abs/astro-ph/0510685 Authors: R. Schneider, R. Salvaterra, A. Ferrara, B. Ciardi Comments: 11 pages, 8 figures, submitted to MNRAS Motivated by theoretical predictions that first stars were predominantly very massive, we investigate the physics of the transition from an...

:confused: I aim trying to do a problem where I have 2 Equatorial Coordinates, and I need to find the angular distance in between this two points. Thanks in advance. :confused:

http://www.space.com/scienceastronomy/050920_andromeda_stars.html

At which rate do Stars burn there fuel, I know there are different stars (giants,dwarfs etc...) For instance i read that our sun fuses 655million tons of Hydrogen into 650 million tons of Helium. The other 5 million is converted into 400 million watts of energy in the process. How did they...

If there are so so so many stars, in what way can you find out the nearest one to your position?

You know how the stars move as the night progresses. Well is it the declination that is varying with time? I don't think that it's the right ascension because with that you measure the angle from the vernal equinox to the point of intersection of the star's meridian with the celestial equator.So...

http://arxiv.org/PS_cache/astro-ph/pdf/0502/0502385.pdf No kidding. Would anybody here like to hazard a guess at where this "reddening dust" lies on the path between the z~6 galaxies and our vantage point? If the "reddening dust" is very ancient and distant, I would be interested in hearing...

It's used to remember the order from brightest (hottest) stars to the dimmest (coldest stars). I remember that it starts with Oh,... then in the middle it maybe be: " Be It A Fine..." Boy/Girl, Kiss Me! So the order is like O ... B G K M It's driving me nuts; please help me!

Stars are known t0 flicker. a) estimate the no. of photons entering the eye of an observer when he looks at the star of first apparent visual magnitude. Such a star produces flux on the surface of the Earth of 10^-6 lumens/sq.meter. One lumen is 0.0016 watts. Star Aldebaran is an example...

In the Milky Way?

http://arxiv.org/abs/astro-ph/0507593 Title: Core-Collapse Very Massive Stars: Evolution, Explosion, and Nucleosynthesis of Population III 500 -- 1000 $M_{\odot}$ Stars Authors: T. Ohkubo, H. Umeda, K. Maeda, K. Nomoto, S. Tsuruta, M. J. Rees Comments: 46 pages, 45 figure files We...

What are they? :confused:

How big can these stars get, Also can a star be born at a Supergiant level? I'm having a hard time understanding a particular object. The Helix Nebula is said to be the result of a supernova explosion, a closeup reveals tiny knots of gas, now these knots are said to be at least the size of...

why variable stars have various magnitudes? and y they are changing periodically?

I have a question about the time scale for a certain type occurance causing a neturon star to explode, and a related question about the conditions of this occurrance. If you have a binary star system with one of the stars being a neutron star, I read that if the other star sucks off enough...

quasars are highly active but extremely distant galaxies, right?what kind of galaxies are they and do they represent an earlier stage of the lives of the conventional galaxies?i've a vague idea that quasars a galaxies in which the supermassive black holes at the centres are actively gobbling up...